Silicone based resin composition, and semiconductor device comprising the same

Abstract

The present invention provides a silicone-based resin composition including an organic polysiloxane; a conductive filler; and a curing catalyst, wherein the conductive filler includes a dendrite-type conductive powder including a main axis with an average length of 20 μm to 50 μm and a plurality of minor axes branched from the main axis, and a thermal conductivity value per unit volume, expressed by Equation 1 (see the detailed description) below, of the silicone-based resin composition is 10 to 40.

Description

[0001] SILICONE BASED RESIN COMPOSITION, AND SEMICONDUCTOR DEVICE COMPRISING THE SAME

[0002] [Technical Field]

[0003] The present invention relates to a silicone-based resin composition and a semiconductor device including the same.

[0004] [Background Art]

[0005] Since most electronic components generate heat during use thereof, it is necessary to remove heat from the electronic components in order for them to function properly. In particular, the amount of heat generated by integrated circuit elements such as CPUs used in personal computers is increasing due to faster operating frequencies, and heat countermeasures have become an important issue.

[0006] Accordingly, many methods for dissipating heat have been proposed, and, for electronic components that dissipate a lot of heat, a method of dissipating heat by interposing a thermally conductive material, such as a thermally conductive grease or a thermally conductive sheet, between electronic components and members such as a heat sink has been proposed.

[0007] Korean Patent Application Publication No. 10-2020-0086307 discloses a semiconductor device including a thermally conductive material.

[0008] [Related Art Document]

[0009] [Patent Document]

[0010] (Patent Document 1) Korean Patent Application Publication No. 10-2020-0086307

[0011] [Disclosure]

[0012] [Technical Problem]

[0013] Therefore, the present invention has been made in view of the above problems, and it is one object of the present invention to provide a silicone-based resin composition capable of implementing high thermal conductivity and providing excellent heat dissipation properties due to improved coverage; and a semiconductor device including the silicone-based resin composition.

[0014] [Technical Solution]

[0015] In accordance with an aspect of the present invention, the above and other objects can be accomplished by the provision of a silicone-based resin composition, including: an organic polysiloxane; a conductive filler; and a curing catalyst, wherein the conductive filler includes a dendrite-type conductive powder including a main axis with an average length of 20 m to 50 m and a plurality of minor axes branched from the main axis, and a thermal conductivity value per unit volume, expressed by Equation 1 below, of the silicone-based resin composition is 10 to 40:

[0016] [Equation 1]

[0017] Thermal conductivity per unit volume = TC(W / mK) / V(%) x 100 where V is a volume ratio of the conductive filler to a total volume of the silicone-based resin composition and is a value excluding a unit, and TC is a thermal conductivity measured by Measurement Method 1 below and is a value excluding a unit:

[0018] [Measurement Method 1]

[0019] 1) The silicone-based resin composition is molded into a size of 30 mm><30 mm mm by heat press.

[0020] 2) Next, the molded silicone-based resin composition is cured at 150 °C for 2 hours to manufacture a sample.

[0021] 3) Athermal conductivity of the sample is measured according to ISO 22007-2 at 25°C.

[0022] In an embodiment of the present invention, the conductive powder may have an aspect ratio of 10 to 50.

[0023] In an embodiment of the present invention, the conductive powder may have a tapped density of less than 2.0 g / cm3. In an embodiment of the present invention, the conductive powder may include a first conductive powder having an average particle diameter (D50) of 10 m to 20 m and a second conductive powder having an average particle diameter (D50) of 1 pm or more and less than 10 pm.

[0024] In an embodiment of the present invention, the first conductive powder may have a specific surface area of 0.2 m2 / g to 1.0 m2 / g.

[0025] In an embodiment of the present invention, the second conductive powder may have a specific surface area of 0.8 m2 / g to 2.0 m2 / g.

[0026] In an embodiment of the present invention, the thermal conductivity (TC) may be 7 W / mK or more.

[0027] In an embodiment of the present invention, a lap shear strength, measured by DIN EN 1465, of the silicone-based resin composition may be 0.5 N / mm2or more.

[0028] In an embodiment of the present invention, a Junction separation length measured by the DIN EN 1465 may be 0.3 mm or more.

[0029] In an embodiment of the present invention, a coverage, measured by Measurement Method 2 below, of the silicone-based resin composition may be 90 % or more:

[0030] [Measurement Method 2]

[0031] 1) the silicone-based resin composition is coated in a weight of 0.7 g on a first silicone substrate having a size of 27 mm *27 mm,

[0032] 2) a second silicone substrate, which has a size the same as or larger than the first silicone substrate, is placed on the coated silicone-based resin composition, and then the silicone- based resin composition is cured in a state of being compressed with a force of 3 kgf,

[0033] 3) an area where the first silicone substrate is in close contact with the second silicone substrate by the cured silicone-based resin composition is derived, and

[0034] 4) the coverage is a ratio of an area of the first silicon substrate in close contact with the second silicon substrate compared to a planar area of the first silicon substrate.

[0035] In accordance with another aspect of the present invention, there is provided a semiconductor device, including: a semiconductor package; a heat dissipation part disposed on the semiconductor package; and a heat conduction layer interposed between the semiconductor package and the heat dissipation part, wherein the heat conductive layer includes a silicone- based resin composition, wherein the silicone-based resin composition includes organic polysiloxane, a conductive filler, and a curing catalyst, wherein the conductive filler includes a dendrite-type conductive powder including a main axis with an average length of 20 m to 50 m and a plurality of minor axes branched from the main axis, and a thermal conductivity value per unit volume, expressed by Equation 1 below, of the silicone-based resin composition is 10 to 40:

[0036] [Equation 1]

[0037] Thermal conductivity per unit volume = TC(W / mK) / V(%) x 100 where V is a volume ratio of the conductive filler to a total volume of the silicone-based resin composition and is a value excluding a unit, and TC is a thermal conductivity measured by Measurement Method 1 below and is a value excluding a unit:

[0038] [Measurement Method 1]

[0039] 1) the silicone-based resin composition is molded into a size of 30 mm><30 mm mm by heat press,

[0040] 2) next, the molded silicone-based resin composition is cured at 150 °C for 2 hours to manufacture a sample, and

[0041] 3) a thermal conductivity of the sample is measured according to ISO 22007-2 at 25°C.

[0042] [Advantageous effects]

[0043] A silicone-based resin composition according to the present invention includes a dendrite-type conductive powder including a main axis with an average length of 20 pm to 50 pm and a plurality of minor axes branched from the main axis, and the thermal conductivity value per unit volume of the silicone-based resin composition satisfies 10 to 40.

[0044] Accordingly, the silicone-based resin composition according to the present invention can implement high thermal conductivity even using a small content of conductive filler, so heat dissipation function can be improved.

[0045] In addition, a cured product of the silicone-based resin composition according to the present invention can implement high thermal conductivity and, at the same time, can have improved coverage and an appropriate spread thickness.

[0046] Accordingly, when the silicone-based resin composition is used for a semiconductor device, the silicone-based resin composition can be coated to a uniform thickness between a semiconductor package and a heat dissipation part, so that the heat dissipation function can be improved.

[0047] [Description of Drawings]

[0048] FIG. 1 is a sectional view illustrating a process of measuring the lap shear strength and Junction separation length of a silicone-based resin composition.

[0049] FIG. 2 is a sectional view illustrating a cross section of a semiconductor device according to an embodiment.

[0050] [Best Mode]

[0051] Structural or functional descriptions of embodiments disclosed in the present specification or application are merely illustrated for the purpose of explaining embodiments according to the technical idea of the present invention, embodiments according to the technical idea of the present invention may be implemented in various forms other than the embodiments disclosed in the present specification or application, and it is not to be construed that the technical idea of the present invention is limited to the embodiments described in the present specification or application..

[0052] In the present specification or application, when a certain part “includes” a certain component, this indicates that the part may further include another component instead of excluding another component unless there is no different disclosure. In addition, it should be understood that all numerical ranges representing physical property values, dimensions, etc. of components described in the present specification or application are modified by the term 'about' in all cases unless otherwise specified.

[0053] In the present specification or application, it will be understood that when each part, surface, layer or substrate is referred to as being “on” or “under” another part, surface, layer or substrate, the part, surface, layer or substrate can be directly on another part, surface, layer or substrate or intervening part, surface, layer or substrate, and criteria for “on” and “under” will be provided based on the drawings. Elements in the following drawings may be exaggerated, omitted, or schematically illustrated for conveniences and clarity of explanation, and the sizes of elements do not reflect their actual sizes completely.

[0054] Now, a silicone-based resin composition according to the present invention and a semiconductor device including the same are described.

[0055] The silicone-based resin composition according to the present invention includes organic polysiloxane.

[0056] The organic poly siloxane may be represented by Formula 1 below:

[0057] [Formula 1]

[0058] RJaSiOb

[0059] In Formula 1, R1may represent one or two or more groups selected from a group consisting of a hydrogen atom, a hydroxy group and a saturated or unsaturated monovalent hydrocarbon group having 1 to 18 carbon atoms, and a may be about 1.8 to about 2.2. a+b may be about 3.5 to about 8. a+b may be 4.

[0060] In Formula 1, the saturated or unsaturated monovalent hydrocarbon group having 1 to 18 carbon atoms represented by R1may be, for example, an alkyl group such as a methyl group, an ethyl group, a propyl group, a hexyl group, an octyl group, a decyl group, a dodecyl group, a tetradecyl group, a hexadecyl group or an octadecyl group; a cycloalkyl group such as a cyclopentyl group or a cyclohexyl group; an alkenyl group such as a vinyl group or an allyl group; an aryl group such as a phenyl group or a tolyl group; an aralkyl group such as a 2- phenylethyl group or a 2-methyl-2-phenylethyl group; or a halogenated hydrocarbon group such as a 3,3,3-trifluoropropyl group, a 2-(perfluorobutyl)ethyl group, a 2-(perfluorooctyl)ethyl group or a p-chlorophenyl group.

[0061] The organic polysiloxane may have a weight average molecular weight of about 40,000 g / mol to about 80,000 g / mol, about 30,000 g / mol to about 100,000 g / mol, about 500 g / mol to about 10,000 g / mol, about 700 g / mol to about 7,000 g / mol, about 1,000 g / mol to about 5,000 g / mol, or about 1,500 g / mol to about 3,000 g / mol. The weight average molecular weight may be measured based on polystyrene.

[0062] A kinematic viscosity at 25°C of the organic polysiloxane may be 10 mm2 / s to 100,000 mm2 / s, 20,000 mm2 / s to 100,000 mm2 / s, or about 30 mm2 / s to about 10,000 mm2 / s. The kinematic viscosity of the organic poly siloxane may be measured at 25°C with an Ostwald viscometer.

[0063] Since the organic polysiloxane has a weight average molecular weight and kinematic viscosity in the ranges, it may maintain appropriate adhesive force to an adherend and improve durability by preventing voids and cracks from thermal shock.

[0064] The organic polysiloxane may include a first organic polysiloxane.

[0065] The first organic polysiloxane includes an alkenyl group bonded to a silicon atom. At least 2, 2 to 10, 2 to 5 or 2 alkenyl groups may be present in one molecule of the first organic polysiloxane.

[0066] The first organic poly siloxane may be represented by Formula 2 below:

[0067] [Formula 2]

[0068] RJaR^SiOb

[0069] In Formula 2, R1may be the hydrogen atom, the hydroxyl group or the saturated or unsaturated monovalent hydrocarbon group having 1 to 18 carbon atoms, and R2may be the alkenyl group. In Formula 2, a+c may be about 1.8 to about 2.2, and a+b+c may be about 3.5 to about 8. In Formula 2, a+b+c may be about 4. In Formula 2, and a may be about 1.8 to about 2.2. In addition, c may be 0.0001 to 0.1.

[0070] The first organic poly siloxane may be represented by Formula 3 below:

[0071] [Formula 3]

[0072] In Formula 3, R1may be the hydrogen atom, the hydroxyl group or the saturated or unsaturated monovalent hydrocarbon group having 1 to 18 carbon atoms, and R2may be the alkenyl group. In addition, in Formula 3, n may be 1 to 1,500, and m may be 0 to 20. In Formula 3, n may be 10 to 1,000, and m may be 0 to 20.

[0073] The first organic polysiloxane may be represented by Formula 4 below:

[0074] [Formula 4]

[0075] In Formula 4, n may be 1 to 1,500. n may be 10 to 1,000.

[0076] The first organic polysiloxane may have a weight average molecular weight (Mw) of about 500 g / mol to about 10,000 g / mol, about 700 g / mol to about 7,000 g / mol, about 1,000 g / mol to about 5,000 g / mol, or about 1,500 g / mol to about 3,000 g / mol. The weight average molecular weight may be measured based on polystyrene.

[0077] A kinematic viscosity at 23°C of the first organic polysiloxane may be 10 cPs to 100,000 cPs, 30 cPs to 50,000 cPs, or 10,000 cPs to 40,000 cPs. The kinematic viscosity of the first organic polysiloxane may be measured at 23°C with an Ostwald viscometer.

[0078] The organic polysiloxane may include a second organic polysiloxane.

[0079] The second organic polysiloxane may include a hydrogen group bonded to a silicon atom. The number of hydrogen groups per molecule of the second organic poly siloxane may be 1 to 10, 2 to 10, 2 to 5, or 2.

[0080] The second organic polysiloxane may be represented by Formula 5 below:

[0081] [Formula 5]

[0082] In Formula 5, R1may be the hydrogen atom, the hydroxyl group or the saturated or unsaturated monovalent hydrocarbon group having 1 to 18 carbon atoms, R3may be the hydrogen atom. In addition, in Formula 5, n may be 1 to 1,500, and m may be 0 to 20. In Formula 5, n may be 10 to 1,000, and m may be 0 to 20. In Formula 5, n may be 1 to 1,500, and m may be 0.

[0083] The second organic poly siloxane may be represented by Formula 6 below:

[0084] [Formula 6]

[0085] A viscosity at about 23°C of the second organic polysiloxane may be about 500 cPs to about 5,000 cPs, about 500 cPs to about 3,000 cPs, or about 500 cPs to about 2,000 cPs.

[0086] The organic polysiloxane may further include a third organic polysiloxane. The third organic poly siloxane may be represented by Formula 7 below:

[0087] [Formula 7]

[0088] In Formula 7, R1may be the hydrogen atom, the hydroxyl group or the saturated or unsaturated monovalent hydrocarbon group having 1 to 18 carbon atoms, and R3may be the hydrogen atom. In addition, in Formula 7, n may be 1 to 1,500, and m may be 1 to 500. In Formula 7, n may be 10 to 1,000, and m may be 1 to 100.

[0089] The third organic poly siloxane may be represented by Formula 8 below: [Formula 8]

[0090] In Formula 8, n may be 1 to 1,500, and m may be 1 to 500. In Formula 8, n may be 10 to 1,000, and m may be 1 to 100.

[0091] A viscosity at about 23°C of the third organic polysiloxane may be about 50 cPs to about 1,000 cPs, about 100 cPs to about 500 cPs, or about 100 cPs to about 500 cPs.

[0092] A ratio of the viscosity of the first organic poly siloxane to the viscosity of the second organic polysiloxane may be 10: 1 to 40: 1.

[0093] In addition, a ratio of the viscosity of the second organic poly siloxane to the viscosity of the third organic polysiloxane may be 2:1 to 10: 1.

[0094] The content of the first organic poly siloxane may be about 60 parts by weight to about 90 parts by weight, about 70 parts by weight to about 85 parts by weight, or about 75 parts by weight to about 85 parts by weight based on 100 parts by weight of the total organic polysiloxanes.

[0095] The content of the second organic poly siloxane may be about 10 parts by weight to about 40 parts by weight, about 10 parts by weight to about 30 parts by weight, or about 12 parts by weight to about 23 parts by weight based on 100 parts by weight of the first organic polysiloxane.

[0096] The content of the third organic poly siloxane may be about 3 parts by weight to about 20 parts by weight, about 3 parts by weight to about 15 parts by weight, or about 4 parts by weight to about 10 parts by weight based on 100 parts by weight of the first organic polysiloxane.

[0097] When the silicone-based resin composition contains the first organic polysiloxane, the second organic polysiloxane and the third organic polysiloxane in the ranges, it may maintain appropriate adhesive force with an adherend and spread evenly during a coating process. The silicone-based resin composition includes a conductive filler.

[0098] Conventionally, a spherical conductive powder was used to improve the heat dissipation properties of a silicone-based resin composition. However, contact characteristics between the conductive powders were low due to a small surface area of the spherical conductive powder, so there was a limitation in implementing excellent heat dissipation properties.

[0099] To improve heat dissipation properties, flake-type and / or dendrite-type conductive powders were used to improve the thermal conductivity of a silicone-based resin composition, but there was a problem of low dispersibility due to high cohesion. In addition, the silicone- based resin composition containing the flake-type and / or dendrite-type conductive powders has a significantly reduced coverage ratio, so, when the silicone-based resin composition is used as a heat conductive layer in a semiconductor device, there is a problem that an area in close contact with a semiconductor package and a heat dissipation part is reduced, and heat dissipation properties deteriorate.

[0100] Accordingly, the present inventors confirmed that, when the conductive filler includes a dendrite-type conductive powder including a main axis with an average length of 20 m to 50 m and a plurality of minor axes branched from the main axis, and the thermal conductivity value per unit volume, expressed by Equation 1 below, of the silicone-based resin composition satisfies 10 to 40, high thermal conductivity can be implemented and improved coverage and an appropriate spread thickness can be achieved even when using a small amount of conductive filler, so excellent heat dissipation properties are exhibited.

[0101] [Equation 1]

[0102] Thermal conductivity per unit volume = TC(W / mK) / V(%) x 100

[0103] In Equation 1, V is a volume ratio of the conductive filler to a total volume of the silicone-based resin composition and is a value excluding a unit, and TC is a thermal conductivity measured by Measurement Method 1 below and is a value excluding a unit.

[0104] [Measurement Method 1]

[0105] 1) The silicone-based resin composition is molded into a size of 30 mm><30 mm mm by heat press.

[0106] 2) Next, it is cured at 150 °C for 2 hours to manufacture a sample. 3) The thermal conductivity of the sample is measured according to ISO 22007-2 at

[0107] 25°C.

[0108] The dendrite-type conductive powder may be an aggregate of dendrite-type conductive particles, and the dendrite-type conductive particles may have a shape including one main axis and a plurality of minor axes branched from the main axis.

[0109] The dendrite-type conductive particles may have a shape including a plurality of minor axes branched from the main axis as an axis of symmetry.

[0110] An average length of the main axis of the dendrite-type conductive particles may be 20 m to 50 m, 21 pm to 50 pm, 22 pm to 50 pm, or 22 pm to 45 pm.

[0111] The average length of the main axis may be calculated by observing 100 particles in 15 fields of view at a magnification of 15,000 times using a scanning electron microscope, and calculating an average value thereof.

[0112] Since the silicone-based resin composition includes a dendrite-type conductive powder having an average main axis length within the ranges, contact characteristics between powders may be improved, and kneading properties with organic polysiloxane may be improved, whereby heat dissipation properties may be improved.

[0113] The thermal conductivity per unit volume may be an indicator of the possibility of peeling of the heat conductive layer which may be caused by shear stress and the possibility of performing an appropriate heat dissipation function.

[0114] When the silicone-based resin composition includes the dendrite-type conductive powder as a conductive filler and a volume ratio of the conductive powder to the total volume of the silicone-based resin composition increases, the thermal conductivity may be improved. However, the dispersibility of the conductive powder may be decreased and the volume ratio of the organic poly siloxane may be relatively decreased, so that the possibility of peeling of the heat conductive layer caused by shear stress may increase.

[0115] Meanwhile, when the volume ratio of the conductive powder to the total volume of the silicone-based resin composition is decreased, the dispersibility of the conductive powder is improved, and the volume ratio of the organic poly siloxane relatively increases, so that the possibility of peeling of the heat conductive layer which may be caused by shear stress may be suppressed. However, since the contact characteristics between the conductive powders are decreased, the thermal conductivity is decreased so that there may be difficulty in performing appropriate heat dissipation function.

[0116] That is, the possibility of peeling of the heat conductive layer which may be caused by shear stress may increase with increasing thermal conductivity per unit volume, whereas the possibility that the thermal conductivity and heat dissipation properties decrease may increase with decreasing thermal conductivity per unit volume.

[0117] Accordingly, the present invention has selected the dendrite-type conductive powder from among various types of conductive powder. By adjusting the average length of the main axis of the dendrite-type conductive powder to 20 m to 50 m and the thermal conductivity per unit volume to 10 to 40, high thermal conductivity may be implemented even with a small content of conductive filler and improved coverage and an appropriate spread thickness may be achieved, whereby the possibility of peeling of the heat conductive layer may be suppressed.

[0118] The thermal conductivity (TC) value may be 7 W / mK or more, 7.5 W / mK or more, 8 W / mK or more, 8.5 W / mK or more, or 7 W / mK to 9.5 W / mK.

[0119] The thermal conductivity value per unit volume may be 10 to 40, 15 to 40, 20 to 40, or 20 to 35.

[0120] When the ranges are satisfied, high thermal conductivity may be implemented and coverage may be improved, so that heat dissipation properties may be improved.

[0121] The conductive powder may include at least one of inorganic particles and metal particles.

[0122] The conductive powder may include silver (Ag) powder. A silver content to a total weight of the conductive powder may be 80 % by weight, 85 % by weight, 90 % by weight, 95 % by weight, or 99 % by weight. Preferably, the silver content in the conductive powder may be 99 % by weight or more.

[0123] Preferably, the conductive powder may not include copper. When the conductive powder includes copper, the conductive powder may be oxidized during a high-temperature curing process of the silicone-based resin composition. In addition, when the silicone-based resin composition is cured, and then the conductive powder is exposed to air, an oxide film may be easily formed on the surface of the copper. The oxidized conductive powder may cause a decrease in thermal conductivity. The conductive powder may have an aspect ratio of 10 to 50, 10 to 45, 10 to 40, or 10 to

[0124] 30.

[0125] The aspect ratio is defined as the length of the major axis of a particle divided by the length of the minor axis of the particle.

[0126] The conductive powder may have a tapped density of less than 2.0 g / cm3, 1.8 g / cm3or less, 1.5 g / cm3or less, or 0.1 g / cm3to 1.0 g / cm3.

[0127] To obtain the tapped density, about 100 g of the conductive powder is weighed and lightly dropped into a 100 ml measuring cylinder using a funnel, and then the cylinder is placed on a tap density meter and the conductive powder is dropped 600 times at a speed of 60 times / min at a drop distance of 20 mm to be compressed. The tapped density is calculated from the volume of the compressed conductive powder.

[0128] The conductive powder may have an average particle diameter (D50) of 1 m to 20 m,

[0129] 1 pm to 18 pm, 2 pm to 18 pm, or 3 pm to 18 pm.

[0130] The average particle diameter is defined as a particle size corresponding to 50% of a cumulative volume in a particle size distribution curve derived from the conductive powder using a laser diffraction method.

[0131] The conductive powder may include two types of conductive powders having different average particle diameters.

[0132] The average particle diameter is defined as a particle size corresponding to 50% of the volume accumulation in the particle size distribution curve of the conductive powder derived using a laser diffraction method.

[0133] The first conductive powder may have a specific surface area of 0.2 m2 / g to 1.0 m2 / g, 0.2 m2 / g to 0.9 m2 / g, 0.3 m2 / g to 0.9 m2 / g, or 0.3 m2 / g to 0.7 m2 / g.

[0134] The second conductive powder may have a specific surface area of 0.8 m2 / g to 2.0 m2 / g, 0.8 m2 / g to 1.8 m2 / g, 0.8 m2 / g to 1.6 m2 / g, or 0.8 m2 / g to 1.5 m2 / g.

[0135] The specific surface area may be measured according to the following calculation equation below by taking about 2 g of the conductive powder as a sample, degassing it at 60 ± 5 °C for 10 minutes, measuring the total surface area with an automatic specific surface area measurement device (BET method), and weighing the sample amount.

[0136] [Calculation equation]

[0137] Specific surface area (m2 / g) = Total surface area (m2) / sample amount (g)

[0138] When the conductive powder includes two types of conductive powders having an average particle diameter within the above ranges, the thermal conductivity and the heat dissipation properties may be further improved.

[0139] The conductive powder may be surface-treated with a surface treatment agent. The surface treatment agent may include a CIO to C20 fatty acid. Examples of the fatty acid include capric acid, lauric acid, myristic acid, palmitic acid, stearic acid, arachidic acid, myristoleic acid, palmitolic acid, sapienic acid, oleic acid, elaidic acid, vaccenic acid, linoleic acid, linolelaidic acid, arachidonic acid, eicosapentaenoic acid, a-linolenic acid, and the like.

[0140] The conductive powder may have an ignition loss (Ig-loss) of less than about 0.8 % by weight, less than about 0.7 % by weight, less than about 0.6 % by weight, less than about 0.5 % by weight, less than about 0.4 % by weight, less than about 0.3 % by weight, less than about 0.2 % by weight, or about 0.01 % by weight or more and less than about 0.4 % by weight. The ignition loss may be performed and measured for about 1 hour at about 538°C.

[0141] The surface of the conductive powder may be effectively treated even with a small amount of the surface treatment agent. That is, the conductive powder has a relatively low tap density and a large specific surface area, and may be surface-treated with a small amount of a surface treatment agent. Accordingly, the conductive powder may be uniformly dispersed in the organic poly siloxane and may improve thermal connection of the conductive filler. That is, since the conductive powder has improved dispersibility, the conductive powder may be added in a high content to the organic polysiloxane.

[0142] The silicone-based resin composition may include the conductive filler in a content of about 300 parts by weight to about 1,000 parts by weight, about 400 parts by weight to about 900 parts by weight, or about 500 parts by weight to about 800 parts by weight based on 100 parts by weight of the organic poly siloxane. When the range is satisfied, proper adhesion to an adherend may be maintained, and durability may be improved because voids and cracks due to thermal shock do not occur. FIG. 1 is a sectional view illustrating a process of measuring the lap shear strength and Junction separation length of a silicone-based resin composition.

[0143] Referring to FIG. 1, a silicone-based resin composition 30 with a thickness of about 200 m is coated on a certain region of the first nickel plate 20, and then the second nickel plate 10 covers the coated silicone-based resin composition 30. Next, the silicone-based resin composition 30 is cured at about 150 °C for about 2 hours. The coated area of the silicone- based resin composition 30 may be about 2.5 cm* 1.25 cm. Next, the first nickel plate 20 and the second nickel plate 10 are pulled in directions opposite to each other in a horizontal direction by a universal testing machine. Here, depending on the length deformed in the horizontal direction, the stress in the horizontal direction is measured on the first nickel plate 20 and the second nickel plate 10.

[0144] The lap shear strength may be the maximum value of stress applied to the first nickel plate 20 and the second nickel plate 10 divided by the coated area of the silicone-based resin composition 30.

[0145] The Junction separation length may be the length transformed in the horizontal direction at the maximum value of the stress applied to the first nickel plate 20 and the second nickel plate 10.

[0146] A lap shear strength measured by DIN EN 1465 may be 0.5 N / mm2or more, 0.6 N / mm2or more, 0.7 N / mm2or more, 0.8 N / mm2or more, or 0.5 N / mm2to 1.5 N / mm2.

[0147] The Junction separation length measured by DIN EN 1465 may be 0.3 mm or more, 0.4 mm or more, 0.5 mm or more, or 0.5 mm to 1.0 mm.

[0148] When the ranges are satisfied, both the bonding stability and heat dissipation properties of the heat conductive layer may be improved.

[0149] A shear modulus expressed by the following equation may be 1 N / mm3or more and less than 3 N / mm:

[0150] [Equation]

[0151] Shear modulus(N / mm3) = LSS(N / mm2) / JSL(mm) where LSS represents the lap shear strength of the silicone-based resin composition measured by DIN EN 1465, and JSL represents the Junction separation length of the silicone- based resin composition measured by the DIN EN 1465.

[0152] The shear modulus may be 1 N / mm3or more and less than 3 N / mm3, 1.1 N / mm3or more and less than 3 N / mm3, 1.3 N / mm3or more and 2.5 N / mm3or less, or 1.6 N / mm3or more and 2.5 N / mm3or less.

[0153] When the ranges are satisfied, deformation and peeling due to shear stress may be suppressed, and deformation caused by external thermal shock may be easily restored.

[0154] The coverage of the silicone-based resin composition measured by Measurement Method 2 below may be 90 % or more, 92 % or more, 94 % or more, 96 % or more, or 99 % or more.

[0155] [Measurement Method 2]

[0156] 1) The silicone-based resin composition is coated in a weight of 0.7 g on the first silicone substrate having a size of 27 mm><27 mm.

[0157] 2) The second silicone substrate, which has a size the same as or larger than the first silicone substrate, is placed on the coated silicone-based resin composition, and then the silicone- based resin composition is cured in a state of being compressed with a force of 3 kgf.

[0158] 3) An area where the first silicone substrate is in close contact with the second silicone substrate by the cured silicone-based resin composition is derived.

[0159] 4) The coverage is a ratio of an area of the first silicon substrate in close contact with the second silicon substrate compared to a planar area of the first silicon substrate.

[0160] In addition, the thickness of the cured resin composition layer may be a spread thickness.

[0161] Since the silicone-based resin composition has the above coverage and spread thickness, the heat conductive layer may be in close contact with the semiconductor package and the heat dissipation part over a large area and may have high heat conduction characteristics when the silicone-based resin composition is used as a heat conductive layer of a semiconductor device.

[0162] The silicone-based resin composition may have a viscosity of 50,000 cPs to 200,000 cPs, 50,000 cPs to 180,000 cPs, 70,000 cPs to 180,000 cPs, or 70,000 cPs to 150,000 cPs.

[0163] The viscosity of the silicone-based resin composition may be measured by the DIN EN ISO 3219 method at about 25°C using a rheometer MCR302 (manufacturer: Anton Paar GmbH) equipped with a plate with a diameter of about 25 mm. Here, a shear rate of about 10 (1 / s) may be applied to measure the viscosity.

[0164] When the ranges are satisfied, appropriate coverage and spread thickness may be obtained.

[0165] The silicone-based resin composition may have a pot life of 10 hours to 16 hours, 10 hours to 15 hours, 10 hours to 14 hours, or 10 hours to 13 hours.

[0166] The pot life may be measured by the following method.

[0167] The silicone-based resin composition is allowed to stand at room temperature. Next, the time it takes for the viscosity of the silicone-based resin composition to increase by 50% compared to an initial viscosity thereof is measured as a pot life.

[0168] A relative ratio of a change in thermal conductivity to a change in Shore A hardness, measured by the following measurement method, of the silicone-based resin composition may be 40% or less.

[0169] [Measurement method]

[0170] 1) The silicone-based resin composition is molded by heat press under conditions of 165°C and a pressure of 26 kgf / cm2for 15 minutes to manufacture a sheet.

[0171] 2) The sheet is cured at 150°C for 5 minutes to manufacture a first cured product. The first cured product is subjected to measurement of a Shore A hardness according to ASTM D- 2240 and measurement of a thermal conductivity according to ISO 22007-2 at 25°C.

[0172] 3) The first cured product is cured at 150°C for 120 minutes to manufacture a second cured product. The second cured product is subjected to measurement of a Shore A hardness according to ASTM D-2240 and measurement of a thermal conductivity according to ISO 22007-2 at 25°C temperature.

[0173] 4) A relative ratio of a change in thermal conductivity to a change in Shore A hardness is calculated according to the following equation:

[0174] [Equation] 100 where Hl denotes the Shore A hardness of the first cured product, H2 denotes the Shore A hardness of the second cured product, TCHI denotes a thermal conductivity (W / mK) in Hl, and TCH2 denotes a thermal conductivity (W / mK) in H2.

[0175] In the silicone-based resin composition, a relative ratio of a change in thermal conductivity to a change in Shore A hardness measured by the measurement method may be 35% or less, 30% or less, 25% or less, 20% or less, 10% or less, 5% or less, or 1% or less.

[0176] A variation in hardness of products manufactured from the silicone-based resin composition may occur depending upon a curing temperature, a curing time, or the composition of the silicone-based resin composition.

[0177] Since a relative ratio of a change in thermal conductivity to a change in Shore A hardness, measured by the measurement method, of the silicone-based resin composition is 40% or less, a change in thermal conductivity compared to a change in hardness is significantly reduced, a thermal conductivity value capable of performing an appropriate heat dissipation function is exhibited, and reliability may be improved when applying a product that needs to perform a heat dissipation function due to a small thermal conductivity variation even if a variation occurs in hardness of a product manufactured from the silicone-based resin composition.

[0178] A Shore A hardness according to ASTM D-2240 of a cured product of the silicone-based resin composition may be 95 or less, 85 or less, 75 or less, 65 or less, 60 or less, 10 to 60 or less, 20 to 60 or less, or 30 to 60 or less. When the hardness is within the range, the occurrence of abrasion or cracking during product manufacturing may be minimized.

[0179] The silicone-based resin composition may satisfy the following equation:

[0180] [Equation]

[0181] Y = 0.0169X + 6.5193 where X denotes a Shore A hardness according to ASTM D-2240 in a cured product of the silicone-based resin composition, Y denotes a thermal conductivity according to ISO 22007-2 at 25°C of a cured product of the silicone-based resin composition, and Y is 6 W / mK to 8 W / mK.

[0182] A coefficient of determination (R2) of X in a range of 3 to 57 may be 0.95 or more.

[0183] Equation denotes a linear trend line with a Shore A hardness as an X variable and a thermal conductivity, which is a dependent variable according to the X variable, as Y. The linear trend line may be derived using Microsoft's Excel program, and a coefficient of determination (R2) may be obtained from the linear trend line. The coefficient of determination, which is a statistical term, is a measure of the goodness of fit of a well-known regression equation and represents a ratio of the sum of fluctuations to the total sum of fluctuations of Yi with respect to data Yi of a dependent variable Y. The coefficient of determination is generally represented by R2, and the goodness of fit of the regression equation increases as the coefficient of determination approaches 1.

[0184] For example, in Equation, Y is 6.6 to 7.4 in a range where X is 3 to 57, which means that a thermal conductivity in a range where the Shore A hardness is 3 to 57 is 6.6 W / mK to 7.4 W / mK. Here, the coefficient of determination (R2) represents 0.95 or more. Accordingly, even if a variation in hardness is large, a variation in thermal conductivity is not relatively large, which may indicate that the goodness of fit of the regression equation is high. Therefore, the silicone-based resin composition that satisfies the equation may satisfy the reliability of product performance due to a small variation in thermal conductivity even if there is a variation in hardness.

[0185] The silicone-based resin composition includes a curing catalyst.

[0186] The curing catalyst may accelerate the curing of the silicone-based resin composition.

[0187] Examples of the curing catalyst include organic titanate esters such as platinum- divinyltetramethyldisiloxane complex, tetrabutyl titanate, and tetraisopropyl titanate; organic titanium chelate compounds such as diisopropoxybi s(acetylacetate)titanium and diisopropoxybis(ethylacetoacetate)titanium; organoaluminum compounds such as aluminum tris(acetylacetonate) and aluminum tri s(ethyl acetoacetate); organic zirconium compounds such as zirconium tetra(acetyl acetonate) and zirconium tetrabutylate; organic tin compounds such as dibutyltin dioctoate, dibutyltin dilaurate, and butyltin-2-ethylhexoate; metal salts of organic carboxylic acids such as tin naphthenate, tin oleate, tin butyrate, cobalt naphthenate, and zinc stearate; amine compounds such as hexylamine and dodecylamine phosphate and salts thereof; quaternary ammonium salts such as benzyltriethylammonium acetate; lower fatty acid salts of alkali metals such as potassium acetate; dialkyl hydroxylamines such as dimethylhydroxylamine and diethylhydroxylamine; and guanidyl group-containing organosilicon compounds.

[0188] The silicone-based resin composition may include the curing catalyst in a content of about 0.01 parts by weight to about 5 parts by weight, about 0.03 parts by weight to about 3 parts by weight, or about 0.1 parts by weight to about 2 parts by weight based on 100 parts by weight of the organic poly siloxane.

[0189] The silicone-based resin composition may further include a tackifier.

[0190] The tackifier may include alkoxysilane. In addition, the tackifier may include an epoxy group. The tackifier may be at least one selected from the group consisting of 2-(3,4 epoxy cyclohexyl) ethyltrimethoxy silane, 3-glycidoxypropyl methyldimethoxy silane, 3- glycidoxypropyl trimethoxy silane, 3-glycidoxypropyl methyldi ethoxy silane, and 3- glycidoxypropyl triethoxysilane.

[0191] The silicone-based resin composition may include the tackifier in a content of about 1 part by weight to about 20 parts by weight, about 1 part by weight to about 10 parts by weight, or about 2 parts by weight to about 8 parts by weight based on 100 parts by weight of the organic polysiloxane. The tackifier may improve adhesive strength between the organic polysiloxane and the conductive filler.

[0192] The silicone-based resin composition may further include a reaction inhibitor. The reaction inhibitor may be at least one selected from the group consisting of acetylenic compounds such as 2-methyl-3-butyn-2-ol, 2-phenyl-3-butyn-2-ol, and 1-ethynyl-l- cyclohexanol; ene-yne compounds such as 3-methyl-3-penten-l-yne and 3,5-dimethyl-3-hexen- 1-yne; curing reaction inhibitors such as hydrazine-based compounds, phosphine-based compounds, and mercaptan-based compound; and the like.

[0193] The silicone-based resin composition may include the reaction inhibitor in a content of about 0.0001 parts by weight to about 10 parts by weight based on 100 parts by weight of the organic polysiloxane.

[0194] A method of preparing the silicone-based resin composition may be a known preparation method, without being specifically limited.

[0195] For example, the silicone-based resin composition may be prepared by mixing the organic polysiloxane, the conductive filler, the curing catalyst, the tackifier, the reaction inhibitor, and the like for 30 minutes to 4 hours using a mixer such as Trimix, Twinmix, and a planetary mixer (all of which are manufactured by Inoue Seisakusho Co., Ltd., registered trademark); Ultramixer (manufactured by Mizuho Kogyo Co., Ltd., registered trademark); or Hibis Disper Mix (manufactured by Primix Co., Ltd., registered trademark). In the mixing process, a process temperature may be about 0°C to about 25°C.

[0196] FIG. 2 is a sectional view illustrating a cross section of a semiconductor device according to an embodiment of the present invention.

[0197] Referring to FIG. 2, the semiconductor device according to the present invention includes a semiconductor package 200, a heat dissipation part 400 placed on the semiconductor package 200, and a heat conductive layer 500 interposed between the semiconductor package 200 and the heat dissipation part 400.

[0198] The semiconductor device may include a circuit board 100 and conductive bumps 300.

[0199] The circuit board 100 may support the semiconductor package 200, the conductive bumps 300, the heat dissipation part 400 and the heat conduction layer 500.

[0200] The circuit board 100 may include a circuit pattern. The circuit board 100 may include a plurality of circuit patterns disposed inside a flat body including an insulating and heat- resistant material and having a predetermined strength. In addition, the circuit board 100 may include a connection pad electrically connected to the circuit pattern and disposed on the body.

[0201] The body of the circuit board 100 may include a thermosetting resin-based substrate such as an epoxy resin substrate or a polyimide substrate, a flat plate, or a flat plate attached with a heat-resistant organic film such as a liquid crystal polyester film or a polyamide film. The circuit pattern may be disposed inside the body in a pattern shape and may include power wiring for power supply, ground wiring, and signal wiring for signal transmission. Each wiring may be disposed to be separated from each other by a plurality of interlayer insulating films formed on upper and lower surfaces of the body.

[0202] The connection pad may be exposed to the outside from the upper surface of the body and may be connected to the circuit pattern. Therefore, an external connection body connected to the circuit board 100 may be electrically connected to an internal circuit pattern through the connection pad.

[0203] Various electronic components may be mounted on a connection pad included in the circuit board 100. The circuit board 100 may be a system board on which electronic components including the semiconductor package 200 are mounted.

[0204] The semiconductor package 200 may be mounted on the circuit board 100. The semiconductor package 200 may be disposed on the circuit board 100. The semiconductor package 200 may be connected to the circuit board 100 through the conductive bumps 300.

[0205] The semiconductor package 200 may include a semiconductor chip including an integrated circuit, a semiconductor package substrate connected to the semiconductor chip, a conductive solder for connecting the semiconductor chip and the semiconductor package substrate, and a sealing part for sealing the semiconductor chip and the conductive solder. The sealing part may include a resin composition such as epoxy molding.

[0206] The semiconductor package 200 may be a memory device, a central processing unit, or the like.

[0207] The conductive bumps 300 may be disposed between the semiconductor package 200 and the circuit board 100. The conductive bumps 300 may electrically connect the semiconductor package 200 and the circuit board 100 to each other. The conductive bumps 300 may be electrically connected to the semiconductor package 200 and the connection pad.

[0208] The heat dissipation part 400 may be disposed on the semiconductor package 200. The heat dissipation part 400 may cover the semiconductor package 200. The heat dissipation part 400 may be bonded to the circuit board 100. The heat dissipation part 400 may cover a side surface of the semiconductor package 200.

[0209] The heat dissipation part 400 may include a conductor. The heat dissipation part 400 may include metal. The heat dissipation part 400 may be thermally connected to an external heat dissipation fin.

[0210] The heat dissipation part 400 may protect the semiconductor package 200 against external physical impact. The heat dissipation part 400 may protect the semiconductor package 200 against external electromagnetic waves. That is, the heat dissipation part 400 may block external electromagnetic waves.

[0211] The heat conduction layer 500 may be disposed between the semiconductor package 200 and the heat dissipation part 400. The heat conduction layer 500 may directly contact the semiconductor package 200 and the heat dissipation part 400. The heat conduction layer 500 may be in close contact between the semiconductor package 200 and the heat dissipation part 400.

[0212] The heat conduction layer 500 may be thermally connected to the semiconductor package 200 and the heat dissipation part 400. That is, the heat conduction layer 500 may transfer heat generated from the semiconductor package 200 to the heat dissipation part 400.

[0213] The thickness of the heat conduction layer 500 may be about 1 m to about 100 m, about 2 pm to about 70 pm, about 5 pm to about 60 pm, or about 10 pm to about 40 pm.

[0214] The heat conductive layer 500 includes a silicone-based resin composition, the silicone- based resin composition includes an organic polysiloxane, a conductive filler, and a curing catalyst, the conductive filler includes a dendrite-type conductive powder having a main axis with an average length of 20 pm to 50 pm and multiple minor axes branched off from the main axis, and a thermal conductivity value per unit volume expressed by Equation 1 below is 10 to 40:

[0215] [Equation 1]

[0216] Thermal conductivity per unit volume = TC(W / mK) / V(%) x 100

[0217] In Equation 1, V is a volume ratio of the conductive filler to a total volume of the silicone-based resin composition and is a value excluding a unit, and TC is a thermal conductivity measured by Measurement Method 1 below and is a value excluding a unit:

[0218] [Measurement Method 1]

[0219] 1) The silicone-based resin composition is molded into a size of 30 mm><30 mm mm by heat press.

[0220] 2) Next, it is cured at 150 °C for 2 hours to manufacture a sample.

[0221] 3) The thermal conductivity of the sample is measured according to ISO 22007-2 at 25°C.

[0222] The silicone-based resin composition may be the same as the silicone-based resin composition described above. The conductive filler of the silicone-based composition includes a dendrite-type conductive powder including a main axis with an average length of 20 m to 50 m and a plurality of minor axes branched from the main axis, and, when the thermal conductivity value per unit volume expressed by Equation 1 satisfies 10 to 40, high thermal conductivity may be implemented even if the heat conductive layer 500 including the silicone- based composition includes a small amount of conductive filler. In addition, the heat conductive layer 500 may maintain appropriate adhesive force to the semiconductor package 200 and the heat dissipation part 400, so heat dissipation function may be improved.

[0223] A method of manufacturing the semiconductor device may be a known manufacturing method, without being specifically limited.

[0224] First, the semiconductor package 200 may be mounted on the circuit board 100 by the conductive bumps 300. Next, the silicone-based resin composition may be coated on the semiconductor package 200. Alternatively, the silicone-based resin composition may be coated on a lower surface of the heat dissipation part 400.

[0225] Next, the heat dissipation part 400 may cover the semiconductor package 200. Accordingly, the coated silicone-based resin composition may be in direct contact with the lower surface of the heat dissipation part 400 and the upper surface of the semiconductor package 200, and the curable silicone resin composition may be cured at about 80°C or more in a state in which a pressure of about 0.01 MPa or more is applied.

[0226] A pressure in the curing process may be about 0.01 MPa or more. The pressure in the curing process may be about 0.05 MPa to about 100 MPa. The pressure in the curing process may be about 0.1 MPa to about 100 MPa.

[0227] A temperature in the curing process may be about 110°C to about 300°C. The temperature in the curing process may be about 120°C to about 300°C. The temperature in the curing process may be about 140°C to about 300°C. A curing time in the curing process may be about 30 minutes to about 20 hours. The heat conduction layer 500 may be formed by the process.

[0228] Hereinafter, the present invention is described in more detail based on Examples and Comparative Examples. However, the following Examples and Comparative Examples are only examples for explaining the present invention in more detail, and the present invention is not limited by the following Examples and Comparative Examples.

[0229] Example

[0230] - Organic poly siloxane #1 : Compound represented by the following Formula 4 having a viscosity of 20,000 cPs at 23°C and including a silicon-bonded alkenyl group:

[0231] [Formula 4]

[0232] - Organic poly siloxane #2: Compound represented by the following Formula 6 having a viscosity of 1,000 cPs at 23 °C and including a structure in which hydrogen groups are bonded to both ends thereof:

[0233] [Formula 6]

[0234] - Organic polysiloxane #3: Compound represented by the following Formula 8 having a viscosity of 1,000 cPs at 23°C and including a structure in which a hydrogen group is bonded to a side chain thereof:

[0235] [Formula 8]

[0236] - Conductive filler #1 : Dendrite-type silver powder having an average particle diameter (Dso) of about 15 pm, an aspect ratio of about 12, an average main axis length of about 30 pm, a specific surface area of about 0.5 m2 / g, and a tapped density of about 1 g / cm3

[0237] - Conductive filler #2: Dendrite-type silver powder having an average particle diameter (Dso) of about 10 pm, an aspect ratio of about 20, an average main axis length of about 22 pm, a specific surface area of about 1.2 m2 / g, and a tapped density of about 1.5 g / cm3

[0238] - Conductive filler #3 : Dendrite-type silver powder having an average particle diameter (Dso) of about 20 pm, an aspect ratio of about 15, an average main axis length of about 45 pm, a specific surface area of about 1 m2 / g, and a tapped density of about 1.2 g / cm3

[0239] - Conductive filler #4: Dendrite-type silver powder having an average particle diameter (Dso) of about 12 pm, an aspect ratio of about 20, an average main axis length of about 35 pm, a specific surface area of about 0.8 m2 / g, and a tapped density of about 1.2 g / cm3

[0240] - Conductive filler #5: Dendrite-type silver powder having an average particle diameter (Dso) of about 15 pm, an aspect ratio of about 12, an average main axis length of about 30 pm, a specific surface area of about 0.5 m2 / g and a tapped density of about 1 g / cm3and surface-treated with fatty acids

[0241] - Conductive filler #6: Dendrite-type silver powder having an average particle diameter (Dso) of about 10 pm, an aspect ratio of about 20, an average main axis length of about 22 pm, a specific surface area of about 1.2 m2 / g and a tapped density of about 1.5 g / cm3and surface- treated with fatty acids

[0242] - Conductive filler #7: Dendrite-type silver powder having an average particle diameter (Dso) of about 15 pm, an aspect ratio of about 10, an average main axis length of about 12 pm, a specific surface area of about 0.2 m2 / g, and a tapped density of about 0.5 g / cm3

[0243] - Conductive filler #8: Dendrite-type silver powder having an average particle diameter (Dso) of about 12 pm, an aspect ratio of about 50, an average main axis length of about 60 pm, a specific surface area of about 3.5 m2 / g, and a tapped density of about 2.5 g / cm3

[0244] - Conductive filler #9: Spherical silver powder having an average particle diameter (D50) of about 2.5 m, an aspect ratio of about 1.1, a specific surface area of about 0.3 m2 / g, and a tapped density of about 6.4 g / cm3

[0245] - Conductive filler #10: Flake-type silver powder having an average particle diameter (D50) of about 1.2 m, an aspect ratio of about 11, a specific surface area of about 0.4 m2 / g, and a tapped density of about 5 g / cm3

[0246] - Tackifier: 3-glycididoxy propyltrimethoxy silane

[0247] - Curing catalyst: Platinum-divinyltetramethyldisiloxane complex

[0248] - Reaction inhibitor: 1-ethynyl-l -cyclohexanol Examples 1 to 8 and Comparative Examples 1 to 4

[0249] A silicone-based resin composition was prepared by adding each composition shown in Table 1 below to a planetary mixer and uniformly mixing at room temperature at a speed of about 40 rpm for 1 hour. [Table 1]

[0250] Experimental examples

[0251] Experimental Example 1 - Measurement of thermal conductivity per unit volume

[0252] The silicone-based resin composition of each of Examples 1 to 8 and Comparative Examples 1 to 4 was molded into a size of 30 mm><30 mm mm by heat press. Next, it was cured at about 150 °C for 2 hours to manufacture a sample. Next, the thermal conductivity of the sample of each of Examples 1 to 8 and Comparative Examples 1 to 4 was measured using a thermal conductivity analyzer (model name: TPS-2500S, manufacturer: Hot Disk AB) according to ISO 22007-2 at 25°C. Separately, a ratio of the volume of the conductive filler to the volume of the silicone-based resin composition of each of Examples 1 to 8 and Comparative Examples 1 to 4 was measured, and thermal conductivity values per unit volume based on the measured thermal conductivity and volume ratio are shown in Table 2 below.

[0253] Experimental Example 2 - Thermal shock test

[0254] The silicone-based resin composition of each of Examples 1 to 8 and Comparative Examples 1 to 4 was allowed to stand at -40°C for 30 minutes and was allowed to stand at 125 °C for 30 minutes. This cycle was repeated about 500 times, and then the thermal conductivity was measured in the same manner as in Experimental Example 1. Results are shown in Table 2 below.

[0255] Experimental Example 3 - Measurement of lap shear strength and Junction separation length

[0256] The silicone-based resin composition of each of Examples 1 to 8 and Comparative Examples 1 to 4 was coated to a thickness of about 200 m on an area of about 2.5 cm* 1.25 cm of the first nickel plate, and then covered with the second nickel plate. Next, the first and second nickel plates were pre-cured at 135°C for about 10 minutes while being compressed with a weight of 3 kgf. Next, the first nickel plate and the second nickel plate were subjected to lap shear strength and Junction separation length measurement according to DIN EN 1465 while being stretched in opposite directions by a universal testing machine (tensile strength analyzer, manufactured by ZwickRoell Gmbh). Results are shown in Table 2 below.

[0257] Experimental Example 4 - Measurement of coverage and spread thickness

[0258] 0.7 g of the silicone-based resin composition of each of Examples 1 to 8 and Comparative Examples 1 to 4 was coated on the first silicone substrate having a size of about 27 mm x 27 mm, and then covered with the second silicone substrate having the same size as the first silicone substrate. Next, it was pre-cured at 135°C for about 10 minutes while applying a force of about 3 kgf to the second silicone substrate. Next, it was cured at 150°C for about 2 hours. Next, the area in which the first silicon substrate and the second silicon substrate were in close contact with the cured coating layer was measured using SAT ultrasonic inspection equipment and an image particle analyzer, and a ratio of the contact area to the total planar area was derived. Results are shown in Table 2 below.

[0259] Experimental Example 5 - Viscosity measurement

[0260] The viscosity of the silicone-based resin composition of each of Examples 1 to 8 and Comparative Examples 1 to 4 was measured at about 25°C according to the DIN EN ISO 3219 method by a rheometer (product name: MCR302, manufacturer: Anton Paar GmbH) using a circular plate with a diameter of 25 mm. Here, the viscosity was measured at a shear rate of about 10(l / s). Results are shown in Table 2 below. Experimental Example 6 - Pot life measurement

[0261] The silicone-based resin composition of each of Examples 1 to 8 and Comparative Examples 1 to 4 was allowed to stand at room temperature, and then the time taken for the viscosity to increase by 50% compared to the initial viscosity was measured. Results are shown in Table 2 below.

[0262] [Table 2]

[0263] Referring to Tables 1 and 2, the silicone-based resin compositions of Examples 1 to 8 include a dendrite-type conductive powder including a main axis with an average length of 20 m to 50 m and a plurality of minor axes branched from the main axis and satisfy a thermal conductivity value per unit volume of 10 to 40. Accordingly, it was confirmed that Examples 1 to 8 exhibit improved thermal conductivity and coverage even when used in a relatively small content compared to Comparative Examples 1 to 4.

[0264] Therefore, the silicone-based resin compositions of Examples 1 to 8 can be coated to a uniform thickness between a semiconductor package and a heat dissipation part and have improved heat dissipation performance, compared to the silicone-based resin compositions of Comparative Examples 1 to 4. [Description of Symbolsl

[0265] 10: second nickel plate

[0266] 20: first nickel plate 30: silicone-based resin composition

[0267] 100: circuit board

[0268] 200: semiconductor package

[0269] 300: conductive bump

[0270] 400: heat dissipation part

[0271] 500: heat conductive layer

Claims

[CLAIMS]

1. A silicone-based resin composition, comprising: an organic polysiloxane; a conductive filler; and a curing catalyst, wherein the conductive filler comprises a dendrite-type conductive powder comprising a main axis with an average length of 20 m to 50 m and a plurality of minor axes branched from the main axis, and a thermal conductivity value per unit volume, expressed by Equation 1 below, of the silicone-based resin composition is 10 to 40:[Equation 1]Thermal conductivity per unit volume = TC(W / mK) / V(%) x 100 where V is a volume ratio of the conductive filler to a total volume of the silicone-based resin composition and is a value excluding a unit, and TC is a thermal conductivity measured by Measurement Method 1 below and is a value excluding a unit:[Measurement Method 1]1) the silicone-based resin composition is molded into a size of 30 mm><30 mm mm by heat press,2) next, the molded silicone-based resin composition is cured at 150 °C for 2 hours to manufacture a sample, and3) Athermal conductivity of the sample is measured according to ISO 22007-2 at 25°C.

2. The silicone-based resin composition according to claim 1, wherein the conductivepowder has an aspect ratio of 10 to 50.

3. The silicone-based resin composition according to claim 1, wherein the conductive powder has a tapped density of less than 2.0 g / cm3.

4. The silicone-based resin composition according to claim 1, wherein the conductive powder comprises a first conductive powder having an average particle diameter (D50) of 10 m to 20 m and a second conductive powder having an average particle diameter (D50) of 1 pm or more and less than 10 pm.

5. The silicone-based resin composition according to claim 4, wherein the first conductive powder has a specific surface area of 0.2 m2 / g to 1.0 m2 / g.

6. The silicone-based resin composition according to claim 4, wherein the second conductive powder has a specific surface area of 0.8 m2 / g to 2.0 m2 / g.

7. The silicone-based resin composition according to claim 1, wherein the thermal conductivity (TC) is 7 W / mK or more.

8. The silicone-based resin composition according to claim 1, wherein a lap shear strength, measured by DIN EN 1465, of the silicone-based resin composition is 0.5 N / mm2or more.

9. The silicone-based resin composition according to claim 8, wherein a Junction separation length measured by the DIN EN 1465 is 0.3 mm or more.

10. The silicone-based resin composition according to claim 1, wherein a coverage, measured by Measurement Method 2 below, of the silicone-based resin composition is 90 % or more:[Measurement Method 2]1) the silicone-based resin composition is coated in a weight of 0.7 g on a first silicone substrate having a size of 27 mm *27 mm,2) a second silicone substrate, which has a size the same as or larger than the first silicone substrate, is placed on the coated silicone-based resin composition, and then the silicone- based resin composition is cured in a state of being compressed with a force of 3 kgf,3) an area where the first silicone substrate is in close contact with the second silicone substrate by the cured silicone-based resin composition is derived, and4) the coverage is a ratio of an area of the first silicon substrate in close contact with the second silicon substrate compared to a planar area of the first silicon substrate.

11. A semiconductor device, comprising: a semiconductor package;a heat dissipation part disposed on the semiconductor package; and a heat conduction layer interposed between the semiconductor package and the heat dissipation part, wherein the heat conductive layer comprises a silicone-based resin composition, wherein the silicone-based resin composition comprises organic polysiloxane, a conductive filler, and a curing catalyst, wherein the conductive filler comprises a dendrite-type conductive powder comprising a main axis with an average length of 20 m to 50 m and a plurality of minor axes branched from the main axis, and a thermal conductivity value per unit volume, expressed by Equation 1 below, of the silicone-based resin composition is 10 to 40:[Equation 1]Thermal conductivity per unit volume = TC(W / mK) / V(%) x 100 where V is a volume ratio of the conductive filler to a total volume of the silicone-based resin composition and is a value excluding a unit, and TC is a thermal conductivity measured by Measurement Method 1 below and is a value excluding a unit:[Measurement Method 1]1) the silicone-based resin composition is molded into a size of 30 mm><30 mm mm by heat press,2) next, the molded silicone-based resin composition is cured at 150 °C for 2 hours to manufacture a sample, and3) a thermal conductivity of the sample is measured according to ISO 22007-2 at 25°C.

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