Semiconductor Device

Abstract

A capacitor 1, which is one embodiment of the semiconductor device according to the present invention, is provided with: a substrate 10 that has a first main surface 10a and a second main surface 10b, which are opposite to each other in the thickness direction; an insulating film 21 that is arranged on the first main surface 10a of the substrate 10; a first electrode layer 22 that is arranged on the insulating film 21; a dielectric film 23 that is arranged on the first electrode layer 22; a second electrode layer 24 that is arranged on the dielectric film 23; a moisture-resistant film 25 that is arranged on the dielectric film 23 and the second electrode layer 24; a protective layer 26 that is arranged on the moisture-resistant film 25; and an external electrode 27 that penetrates through the protective layer 26. The first main surface 10a of the substrate 10 is provided with a level difference 31 on the outer side of the first electrode layer 22 when viewed in plan from the thickness direction.

Description

[Technical field]

[0001] The present invention relates to a semiconductor device. [Background technology]

[0002] A typical capacitor element used in semiconductor integrated circuits is, for example, a metal insulator metal (MIM) capacitor, which has a parallel plate structure in which an insulator is sandwiched between a lower electrode and an upper electrode.

[0003] Patent Document 1 discloses a thin film capacitor characterized by having a capacitor section formed on a supporting substrate and having a first capacitor electrode; a capacitor dielectric film formed on the first capacitor electrode; and a second capacitor electrode formed on the capacitor dielectric film, an extraction electrode extending from the first capacitor electrode or the second capacitor electrode and made of a conductive barrier film that prevents diffusion of hydrogen or moisture, and an external connection electrode connected to the extraction electrode. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2007-173386 A Summary of the Invention [Problem to be solved by the invention]

[0005] In conventional semiconductor devices such as the capacitor described in Patent Document 1, films such as a dielectric film are formed up to the edges of the element. These films are cut during dicing, so chipping of the films is likely to occur, and the films are likely to peel off at the edges of the element. As a result, moisture penetrates into the element from the interfaces between the films, which makes the lower and upper electrodes, which are internal electrodes, more likely to corrode.

[0006] The present invention has been made to solve the above problems, and has an object to provide a semiconductor device with high moisture resistance. [Means for solving the problem]

[0007] The semiconductor device of the present invention comprises a substrate having a first main surface and a second main surface opposed to each other in a thickness direction, an insulating film provided on the first main surface of the substrate, a first electrode layer provided on the insulating film, a dielectric film provided on the first electrode layer, a second electrode layer provided on the dielectric film, a moisture-resistant film provided on the dielectric film and the second electrode layer, a protective layer provided on the moisture-resistant film, and an external electrode penetrating the protective layer.

[0008] In a first aspect, the first main surface of the substrate has a step formed on the outer side than the first electrode layer in a plan view in the thickness direction.

[0009] In a second aspect, a groove is formed on the first main surface of the substrate outside the first electrode layer in a plan view in the thickness direction. Effect of the Invention

[0010] According to the present invention, a semiconductor device having high moisture resistance can be provided. [Brief description of the drawings]

[0011] [Figure 1] FIG. 1 is a cross-sectional view illustrating an example of a capacitor according to a first embodiment of the present invention. [Diagram 2] FIG. 2 is a plan view illustrating an example of the capacitor according to the first embodiment of the present invention. [Figure 3A] FIG. 3A is a cross-sectional view that illustrates an example of a step of preparing a substrate. [Figure 3B] FIG. 3B is a cross-sectional view that typically illustrates an example of a step of forming a step on a substrate. [Figure 3C]FIG. 3C is a cross-sectional view that illustrates an example of a step of forming an insulating film. [Figure 3D] FIG. 3D is a cross-sectional view that illustrates an example of a step of forming a first electrode layer. [Figure 3E] FIG. 3E is a cross-sectional view that illustrates an example of a step of forming a dielectric film. [Figure 3F] FIG. 3F is a cross-sectional view that illustrates an example of a step of forming a second electrode layer. [Figure 3G] FIG. 3G is a cross-sectional view that illustrates an example of a step of forming a moisture-resistant film. [Figure 3H] FIG. 3H is a cross-sectional view that illustrates an example of a step of forming openings in the dielectric film and the moisture-resistant film. [Figure 3I] FIG. 3I is a cross-sectional view that illustrates an example of a step of forming a protective layer. [Figure 3J] FIG. 3J is a cross-sectional view that illustrates an example of a step of forming an external electrode. [Figure 4] FIG. 4 is a cross-sectional view illustrating an example of a capacitor according to a second embodiment of the present invention. [Diagram 5] FIG. 5 is a cross-sectional view illustrating an example of a capacitor according to a third embodiment of the present invention. [Figure 6] FIG. 6 is a cross-sectional view illustrating an example of a capacitor according to a fourth embodiment of the present invention. [Figure 7] FIG. 7 is a cross-sectional view illustrating an example of a capacitor according to a fifth embodiment of the present invention. [Figure 8] FIG. 8 is a cross-sectional view illustrating an example of a capacitor according to a sixth embodiment of the present invention. [Figure 9] FIG. 9 is a plan view illustrating an example of a capacitor according to a sixth embodiment of the present invention. [Figure 10] FIG. 10 is a cross-sectional view illustrating a schematic modification of the capacitor shown in FIG. [Figure 11] FIG. 11 is a cross-sectional view illustrating a schematic modification of the capacitor shown in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] The semiconductor device of the present invention will now be described. However, the present invention is not limited to the following configurations, and can be appropriately modified and applied within the scope of the present invention. Note that the present invention also includes a combination of two or more of the individual preferred configurations of the present invention described below.

[0013] The following embodiments are merely examples, and it goes without saying that partial replacement or combination of the configurations shown in the different embodiments is possible. In the second and subsequent embodiments, the description of the matters common to the first embodiment will be omitted, and only the differences will be described. In particular, the same effects and advantages due to the same configuration will not be mentioned one by one for each embodiment.

[0014] In the following description, unless otherwise specified, each embodiment is simply referred to as the "semiconductor device of the present invention." The shape and arrangement of each component of the semiconductor device of the present invention are not limited to the examples shown in the drawings.

[0015] In the following, a capacitor will be described as an example of one embodiment of the semiconductor device of the present invention. The semiconductor device of the present invention may be a capacitor itself (i.e., a capacitor element) or a device including a capacitor.

[0016] [First embodiment] In the first embodiment of the present invention, a step is formed on the surface of the substrate at the end of the element.

[0017] Fig. 1 is a cross-sectional view showing an example of a capacitor according to a first embodiment of the present invention. Fig. 2 is a plan view showing an example of a capacitor according to a first embodiment of the present invention. Fig. 1 is a cross-sectional view taken along line II of the capacitor shown in Fig. 2.

[0018] In this specification, the length direction, width direction, and thickness direction of a capacitor (semiconductor device) are defined as the directions indicated by arrows L, W, and T, respectively, as shown in Figures 1 and 2. Here, the length direction L, width direction W, and thickness direction T are perpendicular to each other.

[0019] 1 and 2 includes a substrate 10 having a first main surface 10a and a second main surface 10b opposed to each other in a thickness direction (the direction indicated by an arrow T in FIGS. 1 and 2), an insulating film 21 provided on the first main surface 10a of the substrate 10, a first electrode layer 22 provided on the insulating film 21, a dielectric film 23 provided on the first electrode layer 22, a second electrode layer 24 provided on the dielectric film 23, a moisture-resistant film 25 provided on the dielectric film 23 and the second electrode layer 24, a protective layer 26 provided on the moisture-resistant film 25, and an external electrode 27 penetrating the protective layer 26. The external electrode 27 includes a first external electrode 27A connected to the first electrode layer 22 and a second external electrode 27B connected to the second electrode layer 24. The first external electrode 27A penetrates the protective layer 26 , the moisture-resistant film 25 and the dielectric film 23 , and the second external electrode 27B penetrates the protective layer 26 and the moisture-resistant film 25 .

[0020] In the capacitor 1, a first electrode layer 22, a dielectric film 23, and a second electrode layer 24 are laminated in this order to form an MIM capacitor structure. By applying a voltage between the first electrode layer 22 and the second electrode layer 24, a charge can be stored in the dielectric film 23.

[0021] 1 and 2, a step 31 is formed on the first main surface 10a of the substrate 10 outside the first electrode layer 22 in a plan view from the thickness direction T. At the end of the substrate 10 where the step 31 is formed, the thickness of the substrate 10 is smaller than that of the portion where the first electrode layer 22 is provided. In FIG. 1, the insulating film 21, the dielectric film 23, and the moisture-resistant film 25 are provided along the step 31.

[0022] By forming the step 31 in the substrate 10, it is possible to lengthen the moisture intrusion path from the sidewall of the element to the first electrode layer 22 or the second electrode layer 24 (in FIG. 1, the moisture intrusion path is indicated by an arrow P), thereby improving the moisture resistance of the capacitor 1.

[0023] When the difference in height of the first main surface 10a of the substrate 10 in the thickness direction T (or the difference in thickness of the substrate 10) is defined as the "height of the step 31," the height of the step 31 is not particularly limited, but is, for example, 0.1% to 20% of the thickness of the substrate 10 at the portion where the first electrode layer 22 is provided. The height of the step 31 is, for example, 0.1 μm to 10 μm.

[0024] When the dimension of the end of substrate 10 where step 31 is formed in the length direction (the direction indicated by arrow L in FIGS. 1 and 2) or width direction (the direction indicated by arrow W in FIGS. 1 and 2) is defined as the "width of step 31," the width of step 31 is not particularly limited, but is, for example, 0.1% to 20% of the dimension in length direction L of substrate 10 and 0.1% to 20% of the dimension in width direction W of substrate 10. The width of step 31 is, for example, 5 μm to 50 μm.

[0025] 2, the step 31 may be formed continuously or discontinuously along the edge of the substrate 10. The height and width of the step 31 may be constant or may not be constant.

[0026] The number of steps 31 is not particularly limited, and may be one step or two or more steps as shown in Figures 1 and 2. When there are two or more steps 31, the heights and widths of the steps 31 may be the same or different.

[0027] The capacitor 1 shown in FIG. 1 is manufactured, for example, by the following method.

[0028] 3A to 3J are cross-sectional views that diagrammatically show an example of a method for manufacturing a capacitor according to the first embodiment of the present invention. Although one capacitor element is focused on in Fig. 3A to 3J, multiple capacitor elements may be formed simultaneously on a substrate. That is, an aggregate substrate having multiple capacitors may be manufactured, and then the individual capacitor elements may be separated.

[0029] FIG. 3A is a cross-sectional view that illustrates an example of a step of preparing a substrate.

[0030] As shown in FIG. 3A, a substrate 10 having a first main surface 10a and a second main surface 10b opposing each other in the thickness direction is prepared.

[0031] The substrate 10 is not particularly limited, but is preferably a semiconductor substrate such as a silicon substrate or a gallium arsenide substrate, or an insulating substrate such as glass or alumina.

[0032] FIG. 3B is a cross-sectional view that typically illustrates an example of a step of forming a step on a substrate.

[0033] As shown in FIG. 3B, a step 31 is formed on the first main surface 10a of the substrate 10.

[0034] The step 31 can be formed by, for example, an etching method.

[0035] FIG. 3C is a cross-sectional view that illustrates an example of a step of forming an insulating film.

[0036] As shown in FIG. 3C, an insulating film 21 is formed on the first main surface 10a of the substrate 10 on which the step 31 is formed.

[0037] In FIG. 3C, the insulating film 21 is formed to cover the entire first main surface 10a of the substrate 10. In FIG.

[0038] The insulating film 21 can be formed by, for example, a thermal oxidation method, a CVD (chemical vapor deposition) method, a PVD (physical vapor deposition) method, or the like.

[0039] The material constituting the insulating film 21 is not particularly limited, but preferable examples include SiO2, SiN, Al2O3, and the like.

[0040] FIG. 3D is a cross-sectional view that illustrates an example of a step of forming a first electrode layer.

[0041] As shown in FIG. 3D, a first electrode layer 22 is formed on the insulating film 21.

[0042] 3D, the first electrode layer 22 is formed in a region on the insulating film 21 that is inside the region occupied by the substrate 10 and the insulating film 21 and inside the step 31. By not forming the first electrode layer 22 up to the ends of the substrate 10 and the insulating film 21, it is possible to prevent the first electrode layer 22 from being exposed at the end face of the capacitor 1 and causing a short circuit with other components.

[0043] The first electrode layer 22 can be formed by, for example, a lift-off method, a plating method, an etching method, etc. Alternatively, the pattern of the first electrode layer 22 can be formed by combining a sputtering method, a photolithography method, and an etching method.

[0044] The material constituting the first electrode layer 22 is not particularly limited, but is preferably Cu, Ag, Au, Al, or Pt, or an alloy containing at least one of these metals.

[0045] FIG. 3E is a cross-sectional view that illustrates an example of a step of forming a dielectric film.

[0046] As shown in FIG. 3E, a dielectric film 23 is formed on the first electrode layer 22.

[0047] In FIG. 3E, the dielectric film 23 is formed over the entire substrate 10 so as to cover the first electrode layer 22. In FIG.

[0048] The dielectric film 23 can be formed by, for example, a CVD method, a PVD method, or the like.

[0049] The material constituting the dielectric film 23 is not particularly limited, but preferably includes oxides or nitrides such as SiO2, SiN, Al2O3, HfO2, and Ta2O5.

[0050] FIG. 3F is a cross-sectional view that illustrates an example of a step of forming a second electrode layer.

[0051] As shown in FIG. 3F, a second electrode layer 24 is formed on the dielectric film 23.

[0052] 3F, the second electrode layer 24 is formed on a portion of the dielectric film 23. The region where the second electrode layer 24 is formed becomes a capacitance forming portion and functions as a capacitor.

[0053] The second electrode layer 24 can be formed by, for example, a lift-off method, a plating method, an etching method, or the like, in the same manner as the formation of the first electrode layer 22. Alternatively, the pattern of the second electrode layer 24 can be formed by combining a sputtering method, a photolithography method, and an etching method.

[0054] The material constituting the second electrode layer 24 is not particularly limited, but is preferably Cu, Ag, Au, Al, or Pt, or an alloy containing at least one of these metals.

[0055] FIG. 3G is a cross-sectional view that illustrates an example of a step of forming a moisture-resistant film.

[0056] As shown in FIG. 3G, a moisture-resistant film 25 is formed on the dielectric film 23 and the second electrode layer 24.

[0057] In FIG. 3G, the moisture-resistant film 25 is formed on the entire dielectric film 23 so as to cover the second electrode layer 24. In FIG.

[0058] The moisture-resistant film 25 can be formed by, for example, a CVD method, a PVD method, or the like.

[0059] The material constituting the moisture-resistant film 25 is not particularly limited, but preferably includes moisture-resistant materials such as SiO2 and SiN.

[0060] FIG. 3H is a cross-sectional view that illustrates an example of a step of forming openings in the dielectric film and the moisture-resistant film.

[0061] 3H, an opening 28A for exposing the first electrode layer 22 is formed in the dielectric film 23 and the moisture-resistant film 25. In addition, an opening 28B for exposing the second electrode layer 24 is formed in the moisture-resistant film 25.

[0062] The openings 28A and 28B can be formed by, for example, an etching method.

[0063] FIG. 3I is a cross-sectional view that illustrates an example of a step of forming a protective layer.

[0064] As shown in FIG. 3I, a protective layer 26 is formed on the moisture-resistant film 25.

[0065] In FIG. 3I, protective layer 26 has opening 29A over opening 28A and opening 29B over opening 28B.

[0066] The protective layer 26 can be formed by, for example, a spin coating method, etc. Also, the pattern of the protective layer 26 can be formed by a photolithography method, an etching method, etc.

[0067] The material constituting the protective layer 26 is not particularly limited, but preferable examples include resin materials such as polyimide resin and resin in solder resist.

[0068] FIG. 3J is a cross-sectional view that illustrates an example of a step of forming an external electrode.

[0069] As shown in FIG. 3J, an external electrode 27 penetrating the protective layer 26 is formed.

[0070] In FIG. 3J, a first external electrode 27A is formed to fill openings 28A and 29A, and a second external electrode 27B is formed to fill openings 28B and 29B.

[0071] The external electrodes 27 can be formed by, for example, a lift-off method, a plating method, an etching method, or the like.

[0072] The material constituting the external electrode 27 is not particularly limited, but preferably includes Cu, Ni, Ag, Au, Al, etc. The external electrode 27 may have a single-layer structure or a multi-layer structure. The outermost surface of the external electrode 27 is preferably made of Au.

[0073] When manufacturing an aggregate substrate having a plurality of capacitor elements, the aggregate substrate is thinned to a desired element thickness by back grinding, and then diced into pieces of the desired element size. That is, the aggregate substrate is cut into pieces of the size of individual capacitors.

[0074] In this manner, the capacitor 1 shown in FIG. 1 is manufactured.

[0075] [Second embodiment] In the second embodiment of the present invention, as a modification of the first embodiment, an insulating film, a dielectric film, and a moisture-resistant film are provided on the inside of the end portion of the element.

[0076] FIG. 4 is a cross-sectional view illustrating an example of a capacitor according to a second embodiment of the present invention.

[0077] In the capacitor 2 shown in FIG. 4, the insulating film 21, the dielectric film 23, and the moisture-resistant film 25 are provided inside the edge of the substrate 10.

[0078] In the structure of the second embodiment of the present invention, since processing of the insulating film, the dielectric film, and the moisture-resistant film is not required during dicing or the like, chipping of these films does not occur. Furthermore, compared to the structure of the first embodiment, the moisture intrusion path to the first electrode layer or the second electrode layer can be made longer. As a result, moisture resistance can be improved compared to the first embodiment.

[0079] [Third embodiment] In a third embodiment of the present invention, as a modification of the first embodiment, ends of an insulating film, a dielectric film, and a moisture-resistant film are located on the surface of the first main surface of the substrate on which the first electrode layer is provided.

[0080] FIG. 5 is a cross-sectional view illustrating an example of a capacitor according to a third embodiment of the present invention.

[0081] In the capacitor 3 shown in FIG. 5, the ends of the insulating film 21, the dielectric film 23 and the moisture-resistant film 25 are located on the first main surface 10a of the substrate 10 on which the first electrode layer 22 is provided.

[0082] In the third embodiment of the present invention, the same effects as in the second embodiment can be obtained.

[0083] [Fourth embodiment] In a fourth embodiment of the present invention, as a modification of the second embodiment, an end of an insulating film is covered with a dielectric film, and an end of the dielectric film is covered with a moisture-resistant film.

[0084] FIG. 6 is a cross-sectional view illustrating an example of a capacitor according to a fourth embodiment of the present invention.

[0085] 6, the insulating film 21, the dielectric film 23, and the moisture-resistant film 25 are provided inside the end of the substrate 10. Furthermore, the end of the insulating film 21 is covered with the dielectric film 23, and the end of the dielectric film 23 is covered with the moisture-resistant film 25.

[0086] In the fourth embodiment of the present invention, in addition to the effects described in the second embodiment, the insulating film and the dielectric film are sealed with the substrate and the moisture-resistant film, so that the moisture resistance of the element can be ensured without limiting the materials of the insulating film and the dielectric film in consideration of the moisture resistance.

[0087] [Fifth embodiment] In a fifth embodiment of the present invention, as a modification of the third embodiment, an end of an insulating film is covered with a dielectric film, and an end of the dielectric film is covered with a moisture-resistant film.

[0088] FIG. 7 is a cross-sectional view illustrating an example of a capacitor according to a fifth embodiment of the present invention.

[0089] 7, ends of the insulating film 21, the dielectric film 23, and the moisture-resistant film 25 are located on the first main surface 10a of the substrate 10, on which the first electrode layer 22 is provided. Furthermore, an end of the insulating film 21 is covered with the dielectric film 23, and an end of the dielectric film 23 is covered with the moisture-resistant film 25.

[0090] In the fifth embodiment of the present invention, the same effects as in the fourth embodiment can be obtained.

[0091] [Sixth embodiment] In the sixth embodiment of the present invention, a groove is formed in the surface of the substrate, inside the end of the element.

[0092] Fig. 8 is a cross-sectional view illustrating an example of a capacitor according to a sixth embodiment of the present invention. Fig. 9 is a plan view illustrating an example of a capacitor according to a sixth embodiment of the present invention. Fig. 8 is a cross-sectional view taken along line VIII-VIII of the capacitor illustrated in Fig. 9.

[0093] 1 and 2, the capacitor 6 shown in Fig. 8 and Fig. 9 includes a substrate 10 having a first main surface 10a and a second main surface 10b opposed to each other in a thickness direction (the direction indicated by the arrow T in Fig. 8 and Fig. 9), an insulating film 21 provided on the first main surface 10a of the substrate 10, a first electrode layer 22 provided on the insulating film 21, a dielectric film 23 provided on the first electrode layer 22, a second electrode layer 24 provided on the dielectric film 23, a moisture-resistant film 25 provided on the dielectric film 23 and the second electrode layer 24, a protective layer 26 provided on the moisture-resistant film 25, and an external electrode 27 penetrating the protective layer 26. The external electrode 27 includes a first external electrode 27A connected to the first electrode layer 22 and a second external electrode 27B connected to the second electrode layer 24.

[0094] 8 and 9, a groove 32 is formed on the first main surface 10a of the substrate 10 outside the first electrode layer 22 in a plan view in the thickness direction. In Fig. 8, the insulating film 21, the dielectric film 23, and the moisture-resistant film 25 are provided along the groove 32.

[0095] By forming the groove 32 in the substrate 10, the moisture intrusion path P to the first electrode layer 22 or the second electrode layer 24 can be made longer than in the case where the step 31 is formed in the substrate 10. As a result, the moisture resistance can be improved compared to the capacitor 1.

[0096] When the difference in height of the first main surface 10a of the substrate 10 (or the difference in thickness of the substrate 10) in the thickness direction T is defined as the "depth of the groove 32," the depth of the groove 32 is not particularly limited, but is, for example, 0.1% to 20% of the thickness of the substrate 10 in the portion where the first electrode layer 22 is provided. The depth of the groove 32 is, for example, 0.1 μm to 10 μm.

[0097] When the dimension of groove 32 in the length direction (the direction indicated by arrow L in FIGS. 8 and 9) or width direction (the direction indicated by arrow W in FIGS. 8 and 9) is defined as the "width of groove 32," the width of groove 32 is not particularly limited, but is, for example, 0.1% to 20% of the dimension in length direction L of substrate 10 and 0.1% to 20% of the dimension in width direction W of substrate 10. The width of groove 32 is, for example, 5 μm to 50 μm.

[0098] The grooves 32 may be formed continuously or discontinuously along the edge of the substrate 10 as shown in Fig. 9. The depth and width of the grooves 32 may or may not be constant.

[0099] The number of grooves 32 is not limited, and may be one as shown in Figures 8 and 9, or two or more may be formed side by side. When there are two or more grooves 32, the depths and widths of the grooves 32 may be the same or different.

[0100] Capacitor 6 shown in FIG. 8 can be manufactured in a similar manner to capacitor 1 shown in FIG.

[0101] [Other embodiments] The semiconductor device of the present invention is not limited to the above-described embodiment, and various applications and modifications can be made within the scope of the present invention with respect to the configuration and manufacturing conditions of the semiconductor device such as a capacitor.

[0102] For example, the semiconductor device of the present invention may further include a third electrode layer provided on the dielectric film and spaced apart from the second electrode layer, and the first external electrode may be connected to the third electrode layer.

[0103] Fig. 10 is a cross-sectional view typically showing a modified example of the capacitor shown in Fig. 1. Fig. 11 is a cross-sectional view typically showing a modified example of the capacitor shown in Fig. 8.

[0104] 10 and the capacitor 6A shown in FIG. 11 each include a substrate 10 having a first main surface 10a and a second main surface 10b opposed to each other in a thickness direction (the direction indicated by the arrow T in FIG. 10), an insulating film 21 provided on the first main surface 10a of the substrate 10, a first electrode layer 22 provided on the insulating film 21, a dielectric film 23 provided on the first electrode layer 22, a second electrode layer 24 provided on the dielectric film 23, a third electrode layer 30 provided on the dielectric film 23 and spaced apart from the second electrode layer 24, a moisture-resistant film 25 provided on the dielectric film 23, the second electrode layer 24, and the third electrode layer 30, a protective layer 26 provided on the moisture-resistant film 25, and an external electrode 27 penetrating the protective layer 26. The external electrode 27 includes a first external electrode 27A connected to the third electrode layer 30 and a second external electrode 27B connected to the second electrode layer 24. The first external electrode 27A penetrates the protective layer 26 and the moisture-resistant film 25 , and the second external electrode 27B penetrates the protective layer 26 and the moisture-resistant film 25 .

[0105] In the configuration in which the first external electrode is connected to the first electrode layer, such as the capacitor 1 shown in FIG. 1 and the capacitor 6 shown in FIG. 8, a capacitor is formed on the left side, whereas in the configuration in which the first external electrode is connected to the third electrode layer, such as the capacitor 1A shown in FIG. 10 and the capacitor 6A shown in FIG. 11, capacitors are formed on the left and right sides. In the configuration of the capacitor having the third electrode layer, the part in which the first external electrode is connected to the first electrode layer in the configuration shown in FIG. 1 is simply replaced with a configuration in which the first electrode layer, the dielectric film, and the third electrode layer are provided in this order. Therefore, there is no need to take additional space for forming the element compared to the configuration shown in FIG. 1. Therefore, a capacitor with a low capacitance can be fabricated while maintaining the same element area. Such a structure is effective when it is not possible to form a dielectric film with a certain thickness or more. [Explanation of symbols]

[0106] 1, 1A, 2, 3, 4, 5, 6, 6A Capacitor (semiconductor device) 10 Substrate 10a: First main surface of substrate 10b Second main surface of substrate 21 Insulating film 22 1st electrode layer 23 Dielectric Film 24 Second electrode layer 25 Moisture-resistant film 26 Protective layer 27 External electrode 27A 1st external electrode 27B 2nd external electrode 28A, 28B, 29A, 29B opening 30 Third electrode layer 31 Steps 32 Groove P Moisture intrusion path

Claims

1. a substrate having a first main surface and a second main surface opposed to each other in a thickness direction; an insulating film provided on the first main surface of the substrate; A first electrode layer provided on the insulating film; a dielectric film provided on the first electrode layer; a second electrode layer provided on the dielectric film; a moisture-resistant film provided on the dielectric film and the second electrode layer; a protective layer provided on the moisture-resistant film; an external electrode penetrating the protective layer; Equipped with a step is formed on the first main surface of the substrate outside the first electrode layer in a plan view in the thickness direction, the insulating film, the dielectric film and the moisture-resistant film are provided on the inside of an edge of the substrate, an end of the insulating film and an end of the first electrode layer are covered with the dielectric film.

2. A semiconductor device as described in claim 1, wherein the step formed on the first main surface of the substrate is covered with the insulating film, the dielectric film and the moisture-resistant film.

3. A semiconductor device as described in claim 2, wherein an end of the dielectric film is covered with the moisture-resistant film.

4. a substrate having a first main surface and a second main surface opposed to each other in a thickness direction; an insulating film provided on the first main surface of the substrate; A first electrode layer provided on the insulating film; a dielectric film provided on the first electrode layer; a second electrode layer provided on the dielectric film; a moisture-resistant film provided on the dielectric film and the second electrode layer; a protective layer provided on the moisture-resistant film; an external electrode penetrating the protective layer; Equipped with A semiconductor device, wherein a groove is formed on the first main surface of the substrate outside the first electrode layer when viewed in a plan view from the thickness direction.

Images