72results about How to "Uniform resistivity" patented technology

A doped silicon single crystal having a resistivity variation along a longitudinal and/or radial axis of less than 10% and a method of preparing one or a sequential series of doped silicon crystals is disclosed. The method includes providing a melt material comprising silicon into a continuous Czochralski crystal growth apparatus, delivering a dopant, such as gallium, indium, or aluminum, to the melt material, providing a seed crystal into the melt material when the melt material is in molten form, and growing a doped silicon single crystal by withdrawing the seed crystal from the melt material. Additional melt material is provided to the apparatus during the growing step. A doping model for calculating the amount of dopant to be delivered into the melt material during one or more doping events, methods for delivering the dopant, and vessels and containers used to deliver the dopant are also disclosed.

An electrothermic purifying filter element for treating high-air-quantity VOCs (volatile organic chemicals) waste gas comprises a containment structure and an adsorption bed layer filled in the containment structure, and is characterized in that activated carbon eyelet fabrics or/and porous activated carbon fiber cloth (felt) are overlapped to form the adsorption bed layer, an electrode A and an electrode B are arranged on two optional opposite end surfaces or positions close to the end surfaces of the adsorption bed layer, current can be led into the adsorption bed layer via the two electrodes, a couple is arranged in the adsorption bed layer, the temperature of the adsorption bed layer is tested in an electrothermic temperature rising process, the containment structure comprises a sealing portion, an air inlet surface and an air outlet surface, and each of the air inlet surface and the air outlet surface is made of one layer or multiple layers of mesh or porous materials. The air resistance of the electrothermic purifying filter element for treating the high-air-quantity VOCs waste gas is reduced, the high-air-quantity organic waste gas is treated by small equipment, filling quantities of adsorption materials in units of the adsorption bed layer are increased, adsorption period is long, energy consumption caused by frequent desorption and adsorption switching of the equipment due to low filling quantities of the adsorption materials is avoided, the adsorption materials are filled compactly, resistivity of the adsorption bed layer is uniform and identical, and potential safety hazards caused by local over heat are avoided.

It is the object of the present invention to provide not only a semiconductor wafer obtained by forming a semiconductor thin film with uniform resistivity and substantially no slip dislocation on a main surface of a semiconductor single crystal substrate having a relatively low dopant concentration, as large as 300 mm or more in diameter but also a vapor phase growth apparatus by means of which such a semiconductor wafer can be produced. A dopant gas is supplied into a reaction chamber 10 through all of the inlet ports 18a to 18f disposed in a width direction of the reaction chamber 10 from a common gas pipe 22a functioning as a main dopant gas pipe. Further, the dopant gas is additionally supplied through inner inlet ports 18a and 18b, and middle inlet ports 18c and 18d, as specific gas inlet ports, into the reaction chamber 10 from first and second auxiliary dopant gas pipes 22b and 22c.

The invention relates to a crystal material with a bigger size, which is manufactured by using a seed crystal induction vertical directional solidification casting method, in particular to a polycrystal or monocrystal material suitable for photoelectric application, such as silicon or silicon germanium. A traditional seed crystal used for casting a silicon crystal has a bigger size and higher consumption, thus, the invention provides a seed crystal with a smaller size and lower consumption, a method of casting a polycrystal or a monocrystal with the bigger size by using the seed crystal and the directional solidification method, the crystal material obtained by adopting the method, including a semiconductor crystal, and an application of the seed crystal in manufacturing semiconductor devices.

The invention generally relates to a vertical directional solidification casting method using seed crystal induction, which is used for manufacturing a crystal material with a reserved crystal orientation and comprises a polycrystal material and a monocrystal material. When a traditional method for casting the crystal by using the seed crystal induction is used for producing the crystal with a bigger size, the problems that the seed crystal consumption is high, a mixed crystal is easy to generate, the internal stress is high, the monocrystal material is hard to obtain or the expected quality requirement is hard to reach and the like exist. The problems are solved by the invention through providing a gradually-changed crystal growth area of which the horizontal cross section is gradually increased, thereby, a good crystal growth effect is obtained, and the obtained cast monocrystal or polycrystal material, such as silicon or silicon germanium, has fewer defects, high quality and a good performance, and is especially suitable for the application of the semiconductor field and the photovoltaic field.

Methods for depositing an amorphous vanadium oxide (VO_x) film include vaporizing vanadium from a vanadium source while the a gas containing an oxygen species and a process modifying additive are in the chamber so as to deposit an amorphous VO_x film on the substrate, where x>0. The process modifying additive includes a gas flowing into the chamber or vaporized material from a target source. The additive may stabilize the deposition rate of VO_x, reduce resistivity, improve thickness control, and improve uniformity of thickness and resistivity. The thin film may be a nitrogen-enhanced, amorphous vanadium oxide (VO_xN_y) film formed on a substrate, where x>y>0, and the film contains at least 0.2 atomic % nitrogen. The film may be used in a device, such as a thermal or infrared sensor, or more particularly a bolometer.

A method for producing a conductive nitride semiconductor substrate circuit includes the steps of forming, on an underlying substrate, a mask including dot or stripe masking portions having a width or diameter of 10 to 100 μm and arranged at a spacing of 250 to 10,000 μm; growing a nitride semiconductor crystal on the underlying substrate by hydride vapor phase epitaxy (HVPE) at a growth temperature of 1,040° C. to 1,150° C. by supplying a group III source gas, a group V source gas, and a silicon-containing gas in a V/III ratio of 1 to 10; and removing the underlying substrate, thus forming a free-standing conductive nitride semiconductor crystal substrate having a resistivity r of 0.0015 Ωcm≦r≦0.01 Ωcm, a thickness of 100 μm or more, and a radius of bow curvature U of 3.5 m≦U≦8 m.

The invention relates to the technical fields of metal smelting and powder preparation, and discloses a manufacturing method for a high-purity iron-chromium-aluminum alloy powder. The manufacturing method comprises the two phases of melting and gas atomization. Compared with the prior art, the manufacturing method is capable of effectively preventing powder oxidation and avoiding impurity elements; and meanwhile, a powder is adequately dispersed in a cooling process, and the generation of a satellite spherical powder in the powder is reduced, so that preparation for the spherical alloy power with a small particle size is realized. The prepared alloy powder is small in particle size, high in sphericity degree and flowability, low in oxygen content and satellite spherical powder content, good in atomization effect, and capable of effectively preventing the powder oxidation, realizing high purity of alloy, refining crystalline grains, reducing inclusions, reducing separation for the brittle phase of nitride, and providing raw materials with excellent performance for the subsequent powder metallurgy process.

The present invention provides a method for producing a high-quality nonconductive or semi-conductive seamless (jointless) tubular polyimide film in a simple, efficient, and economical manner, and the like. More specifically, the invention relates to an electrically non-conductive or electrically semi-conductive seamless tubular polyimide film comprising polyimide having at least two aromatic tetracarboxylic acid derivatives comprising 15 to 55 mol % of asymmetric aromatic tetracarboxylic acid component and 85 to 45 mol % of symmetric aromatic tetracarboxylic acid component and at least one aromatic diamine component, in which, as required, a specific amount of carbon black is dispersed, and relates to a method for producing the same.

The invention relates to a charging roller and a preparation method thereof. The charging roller comprises a metal shaft, on which a polyurethane elastomer is bonded, and a conductive surface layer with a thickness of 10-40 μm is sprayed on the surface of the polyurethane elastomer. , the polyurethane elastomer is made of a prepolymer-R liquid and a prepolymer-P liquid, and the prepolymer-R liquid includes a conductive substance with a weight percentage of 2 to 8%; the prepolymer Polymer-P liquid includes isocyanate of 50-70% by weight; the charging roller of the present invention is made of polyurethane material, which has proper elasticity, good wear resistance, good heat resistance, and good chemical stability. It is not easy to produce photosensitive drum contamination, and the compression deformation rate is low.

The invention discloses a preparation method of a self-compensation back-sealing semiconductor substrate. The preparation method comprises a technical method of growing an opposite type lightly doped epitaxial layer on a heavily doped substrate. By adopting a mean of producing a self-compensation back sealing layer before the epitaxial growth in the substrate processing stage, the method for growing lightly doped epitaxial layer in opposite conduction type in batches on the heavily doped substrate is provided to solve a problem of same-type epitaxial growth on the inner edge of a chip or the whole chip caused by lightly doped epitaxial atmosphere transoid which is resulted from a backside self-doping effect and an edge effect. With the adoption of the self-compensation back sealing technology, that the epitaxial parameters meet with the product demands still can be guaranteed even full-furnace growth is performed by using a normal-pressure epitaxial furnace.

The invention relate to a developing roller and a preparation method thereof. The developing roller comprises a metallic axle. The metallic axle is adhered with a polyurethane elastomer. The surface of the polyurethane elastomer is coated with a developing surface layer the thickness of which is 10 to 40Mum. The polyurethane elastomer is made of prepolymer-R solution or prepolymer-P solution. The prepolymer-R solution comprises conductive substances the weight percentage of which is 2 to 8 percent. The prepolymer-P solution comprises TDI the weight percentage of which is 50 to 70 percent. The developing roller is made of prepolymer materials. Therefore, the invention has the advantages of proper elasticity, good wear resistance, good heat resistance, good chemical stability, and low compression deformation rate and is not likely to pollute the OPC drum.

The invention discloses a silicon carbide consubstantial PIN (Personal Identification Number) microstructure material which comprises an N type silicon carbide substrate, an N-variable concentration buffer layer arranged on the N type silicon carbide substrate, an intrinsic layer arranged on the N-variable concentration buffer layer, and a P+ cap layer arranged on the intrinsic layer. The invention simultaneously discloses a preparation method of the silicon carbide consubstantial PIN microstructure material. The invention can prepare an extension SiC epitaxial material with the advantages ofbright surface and uniform resistivity, the background carrier concentration of the intrinsic epitaxial layer can be reduced to the 1015 order of magnitude, and the microstructure material provided by the invention is suitable for high-power electronic and electric devices of semiconductors.

The invention discloses a method for improving on-chip resistivity uniformity of an epitaxial wafer, and relates to the technical field of a fabrication method for a silicon substrate epitaxial layer. The method comprises the following steps of corroding an epitaxial furnace base under a high temperature by a high-purity hydrogen chloride gas; loading a silicon substrate sheet into a pit of the epitaxial furnace base, and blowing an epitaxial furnace cavity by high-purity hydrogen during the temperature rising process of an epitaxial furnace until a set temperature is reached; performing heat preservation for over 5 minutes; performing large-flow and variable-flow blowing when the temperature of the epitaxial furnace is risen to the set temperature, wherein the gas flow is set 100-(-400)L/min, and the time is more than 4 minutes; and reducing the temperature of the epitaxial furnace to an epitaxial growth temperature, and performing epitaxial growth of the silicon substrate sheet. By the method, the on-chip resistivity of the epitaxial wafer can be more uniform, the finished rate is greatly improved, and the profile consistency of SRP curve is greatly improved.

The invention relates to the technical field of monocrystalline silicon czochralski and provides a continuous czochralski single crystal furnace for controlling oxygen content in monocrystalline silicon, which comprises a crucible, a crucible inner dam, asealing shell and a feeder, the feeder comprises a molten silicon feeder, the molten silicon feeder is arranged above the crucible and provides liquid silicon for the crucible according to a preset speed; and the sealing shell is used for carrying out surrounding and vacuum sealing on the whole structure of the continuous Czochralski single crystal furnace. The depth of the liquid level of the liquid molten silicon in the crucible is smaller than 1/2 of the diameter of the crucible, and the maximum amount of the molten silicon in the crucible is smaller than 2/3 of the total molten silicon demand quantity of single crystal pulling. The invention also provides a continuous Czochralski single crystal method for controlling the oxygen content and/or inhibiting the COP of the single crystal silicon. The method can inhibit the exchange of oxygen atoms inside and outside the dam, reduces impurities such as oxygen atoms to inhibit the COP of monocrystalline silicon, and is effective, simple and convenient.

The invention provides a vertical double-diffused metal oxide semiconductor field effect transistor (VDMOS) having a semi-insulating polysilicon layer (SIPOS). The VDMOS is mainly characterized in that an SIPOS filling layer is formed on the side wall of a device drift region, and two ends of the SIPOS filling layer are connected with a gate end and a drain end of the VDMOS. On one hand, since the SIPOS has uniform resistivity, the SIPOS has a uniform electric field when the VDMOS is turned off. According to an electric displacement continuity equation, an electric field on the device drift region is modulated by means of the uniform electric field on the SIPOS and becomes more uniform, and the SIPOS layer enhances the depletion of the device drift region of the VDMOS, thus doping concentration of the device drift region is increased, and the VDMOS has low on-resistance when being turned on; on the other hand, since a potential difference exists between the surfaces of the SIPOS layer and the device drift region, the device drift region has majority carrier accumulation, thereby further decreasing the on-resistance of the VDMOS.

A susceptor support shaft for an epitaxial growth apparatus capable of forming a high quality epitaxial film by suppressing in-plane resistance variation of the epitaxial film due to deflection of a susceptor, wherein the susceptor support shaft supports a susceptor at an underneath portion of the susceptor in an epitaxial growth apparatus. The susceptor support shaft includes a support column located substantially coaxial with a center of the susceptor; a plurality of arms extending radially from the support column to positions under a peripheral portion of the susceptor; an arm connecting member connecting tips of the arms next to each other; and support pins extending from the arm connecting member, thereby supporting the susceptor.

The invention relates to a preparation process of a high-uniformity conductive silicon target material. The preparation process comprises the following steps of 1, preparing materials, specifically, high-purity silicon powder and boron powder are added according to the proportion that the boron concentration content is 20-200 ppm; 2, grinding, specifically, ball milling is carried out on the mixture obtained in step 1 by using a mechanical ball mill; 3, spray granulating, specifically, the powder, with the particle size of 1-10 micros, ground in the step 2 is introduced into a spray granulation dryer for granulating, and spherical ground powder with the particle size of 40-160 micros is obtained; and 4, vacuum spraying, specifically, the spherical powder obtained in the step 3 is sprayed on the surface of a target material base material in a low vacuum environment by means of a plasma spraying mode. According to the preparation process of the high-uniformity conductive silicon target material, the quality of the target material is effectively improved, and the cost is reduced.