1004 results about "N type silicon" patented technology

A silicon carbide power device is fabricated by forming a p-type silicon carbide epitaxial layer on an n-type silicon carbide substrate, and forming a silicon carbide power device structure on the p-type silicon carbide epitaxial layer. The n-type silicon carbide substrate is at least partially removed, so as to expose the p-type silicon carbide epitaxial layer. An ohmic contact is formed on at least some of the p-type silicon carbide epitaxial layer that is exposed. By at least partially removing the n-type silicon carbide substrate and forming an ohmic contact on the p-type silicon carbide epitaxial layer, the disadvantages of using a p-type substrate may be reduced or eliminated. Related structures are also described.

An element isolation dielectric film is formed around device regions in a silicon substrate. The device regions are an n-type diffusion region, a p-type diffusion region, a p-type extension region, an n-type extension region, a p-type source/drain region, an n-type source/drain region, and a nickel silicide film. Each gate dielectric film includes a silicon oxide film and a hafnium silicate nitride film. The n-type gate electrode includes an n-type silicon film and a nickel silicide film, and the p-type gate electrode includes a nickel silicide film. The hafnium silicate nitride films are not on the sidewalls of the gate electrodes.

The invention provides a method for preparing an N-type crystalline silicon solar cell with aluminum-based local emitters on the back side. The method comprises the following steps: firstly, selecting N-type silicon wafers to carry out the surface-textured etching process; further forming a front surface field through phosphorous diffusion; depositing a passivating film on the front surface after the phosphorosilicate glass is formed during the removal of diffused phosphorous; carrying out the back-side chemical polishing process on the silicon wafers to remove the N+ layer formed on the back side during the phosphorous diffusion; then, sequentially printing an aluminum layer or a silver-aluminum layer through the passivating film deposited on the back side, local holes or grooves on the back side and screens on the back side; then, printing silver paste on the front surface; and finally, carrying out the one-step sintering process to form a local P+ layer on the back side and allowing the P+ layer to coming into ohmic contact with the electrodes on the front and back surfaces. By using the N-type substrate, forming local aluminum-based P-N junctions on the back side and further using the back-side chemical polishing process to remove the edge junctions, the invention can substitute for the conventional stacking-type plasma etching process, simplify the technological procedures and further bring a series of performance improvement to cells.

A semiconductor device includes: an n⁺ type drain region; an n type drift region that connects with the n⁺ type drain region; a p type body region; a n⁺ type source region that connects with the p type body region; and a gate electrode that is provided, with being covered by a gate insulation film, in a gate trench that penetrates the p type body region. The semiconductor further includes: a p type silicon region that adjoins the n type drift region; and an n type silicon region provided in a region almost including a carrier passage that connects the n type drift region and the p type body region. Here, the p type silicon region and the p type body region directly connect with each other.

A multi-spectrum photosensitive device comprises two, three, or four composite sensing pixels arranged in layers up and down in a base layer of P-type or N-type silicon by means of single-sided processing or double-sided processing, each composite sensing pixels can sense respectively spectrum orthogonal or complementary to each other in visible light or visible and infrared light. The basic sensing pixels on different layers of the composite sensing pixels can be designed to sense different colors or spectrums, so that a multi-spectrum photosensitive chip can be achieved by repeatedly arranging the macro units consisting of more than one composite sensing pixel. The present disclosure also includes a new multi-layer sensing pixel, and examples of which used in a single-sided double-layer, or a double-sided double-layer, or a double-sided three-layer, or a double-sided four-layer, or a single-sided mixed double-layer, or a double-sided mixed with double-layer or a multi-layer multi-spectrum sensing device. A multi-spectrum photosensitive device according to the present disclosure has the advantage of better color sensing performance, integration of color sensing and infrared sensing, and a simple processing technique.

The invention relates to a silicon wafer and an epitaxial silicon wafer, which are doped with arsenic (As) as an n-type dopant and are excellent in gettering characteristics. A first silicon wafer has a resistivity of 10 OMEGAcm to 0.001 OMEGAcm as a result of addition of arsenic and has a nitrogen concentration of 1x1013 to 1x1015 atoms/cm3. A second silicon wafer has a resistivity of 0.1 OMEGAcm to 0.005 OMEGAcm and a nitrogen concentration of 1x1014 to 1x1015 atoms/cm3. A third silicon wafer has a resistivity of 0.005 OMEGAcm to 0.001 OMEGAcm and a nitrogen concentration of 1x1013 to 3x1014 atoms/cm3. An epitaxial silicon wafer derived from any of the first to third silicon wafers by forming an epitaxial layer in the surface layer portion is provided. In producing this epitaxial silicon wafer, epitaxial layer formation is desirably carried out after subjecting the silicon wafer to heat treatment for forming oxygen precipitates under conditions of a temperature not lower than 700° C. but lower than 900° C. and a period of 30 minutes to 4 hours. By these, an oxygen precipitate density can be secured and a sufficient gettering effect can be produced in the device producing process in spite of their being n-type silicon wafers doped with a high concentration of arsenic.

A semiconductor device includes a semiconductor substrate of n-type silicon including, in an upper portion thereof, a first polarity inversion region and a second polarity inversion regions spaced from each other and doped with a p-type impurity. A first HFET including a first active layer and a second HFET including a second active layer both made of a group Ill-V nitride semiconductor are independently formed on the respective polarity inversion regions in the semiconductor substrate, and the HFETs are electrically connected to each other through interconnects.

The invention discloses a high-brightness light emitting diode with a GaN-based multiquantum-well structure and a preparation method thereof, and relates to a light emitting diode. The light emitting diode comprises a substrate, a low temperature buffer layer, an n-type doped GaN layer, 3 to 5 InGaN/GaN multiquantum wells, a p-type doped AlGaN layer, a p-type doped CaN layer, 5 periodic p-InGaN/p-AlGaN superlattice layers, a p-type ohmic contact layer and an n-type ohmic contact layer prepared on the n-type doped GaN layer in turn from bottom to top. The preparation method comprises the following steps: putting the substrate into a reaction chamber to perform thermal treatment for growing a GaN buffer layer, an n-type silicon-doped GaN layer, 3 to 5 periodic InGaN/GaN multiquantum wells with graded components, a p-type Mg-doped AlGaN layer, a p-type Mg-doped GaN layer and 5 periodic Mg-doped p-InGaN/p-AlGaN superlattice layers in turn; performing annealing after epitaxial growth; etching an n-type GaN layer; and preparing the n-type and the p-type ohmic contact layers.

The invention discloses an organic-inorganic hybridization solar battery which comprises a metal backing electrode, an n-type silicon substrate layer, a silicon nanometer wire array and a battery positive electrode and also comprises a p-type cavity transmission shell layer, wherein the p-type cavity transmission shell layer is a conjugated organic matter semiconductor thin film; the metal backing electrode is arranged on the lower surface of the n-type silicon substrate layer; the silicon nanometer wire array is arranged on the upper surface of the n-type silicon substrate layer; the surfaceof a silicon nanometer wire in the silicon nanometer wire array is covered by the layer of p-type cavity transmission shell layer; and the battery positive electrode is arranged on the p-type cavity transmission shell layer. As a three-dimensional radial p-n junction hybridization structure formed by the silicon nanometer wire array and the conjugated organic matter is adopted in the organic-inorganic hybridization solar battery, on one hand, the absorption of light is increased, the usage amount of silicon is reduced, the purify requirement on the silicon is reduced, on the other hand, the transmission range of current carriers is shortened, the problem that the current carriers are easy to combine is reduced, and the photoelectric conversion efficiency is improved.

Methods and compositions for making photovoltaic devices are provided. A metal that is reactive with silicon is placed in contact with the n-type silicon layer of a silicon substrate. The silicon substrate and reactive metal are fired to form a silicide contact to the n-type silicon layer. A conductive metal electrode is placed in contact with the silicide contact. A silicon solar cell made by such methods is also provided.

The invention discloses a HIT (Heterojunction with Intrinsic Thin Layer) solar cell and electrode preparation and series connection methods thereof. The HIT solar cell comprises a metal wire conduction band and solar cell pieces, wherein each solar cell piece comprises an N type silicon plate; the front side of each N type silicon plate is provided with an intrinsic amorphous silicon film and a P type amorphous silicon film; the back side of each N type silicon plate is provided with an intrinsic amorphous silicon film and an N type amorphous silicon film in sequence; the P type amorphous silicon films and the N type amorphous silicon films are provided with transparent conduction oxide films; one solar cell piece is arranged below the front half portion of the metal wire conduction band; the back half portion of the metal wire conduction band is provided with one solar cell piece. Compared with the conventional HIT solar cell, the method has the advantages that a main gate electrode and a fine gate electrode do not need to be printed, and solar cells can be connected in series without bus bars. On one hand, the metal wire portions of the metal wire conduction band are arranged in parallel on the front side or back side of the solar cell, and current on the surfaces of solar cells is collected and conducted out to realize the functions of a fine gate and a main gate; on the other hand, two solar cells are connected in series to serve as a bus bar.

The invention relates to a high efficiency N-type double-faced solar cell and a preparation method thereof. The structure of the solar cell comprises an N-type silicon slice substrate, a front side boron doping layer, a back side phosphor doping layer, double-faced silicon dioxide passivation layers, doubled-faced silicon nitride antireflection layers and double-faced electrodes. The invention further discloses a preparation method for the solar cell, the preparation method particularly comprises the first step that double-faced texturization is conducted; the second step that front side boron diffusion is conducted; the third step that front side film masking is conducted; the fourth step that back side washing is conducted; the fifth step that back side phosphorus diffusion is conducted; the sixth step that a mask film is removed; the seventh step that double-faced passivation is conducted; the eighth step that double-faced film coating is conducted; the ninth step that the front side electrodes and the back side electrodes are formed; the tenth step that laser edge carving is conducted. According to the high efficiency N-type double-faced solar cell and the preparation method thereof, knots are formed on both the front side and the back side of the N-type silicon slice, the front side and the back side both have high photoelectric converting rates, the output power of an assembly of the high efficiency N-type double-faced solar cell is 20% higher than the output power of a common solar cell, and meanwhile the high efficiency N-type double-faced solar cell is applicable to large-scale industrial production due to the fact that the preparation technology is simple and practical.

A silicon carbide semiconductor element, including: i) an n-type silicon carbide substrate doped with a dopant, such as nitrogen, at a concentration C, wherein the substrate has a lattice constant that decreases with doping; ii) an n-type silicon carbide epitaxially-grown layer doped with the dopant, but at a smaller concentration than the substrate; and iii) an n-type buffer layer doped with the dopant, and arranged between the substrate and the epitaxially-grown layer, wherein the buffer layer has a multilayer structure in which two or more layers having the same thickness are laminated, and is configured such that, based on a number of layers (N) in the multilayer structure, a doping concentration of a K-th layer from a silicon carbide epitaxially-grown layer side is C·K/(N+1).

A field effect transistor (FET) is provided. The FET includes a first material layer, second material layer and a third material layer. The third material layer includes an n-type silicon substrate layer and a gate electrode. The gate electrode includes an insulating substrate with at least one conducting metal. The second material layer is disposed on the third material layer. The first material layer is disposed on the second material layer. A source electrode is disposed on the first material layer. A drain electrode is disposed on the first material layer. A plurality of gold nanostructures are disposed on an active channel of the FET. The plurality of gold nanostructures are electrically isolated from the source electrode, drain electrode and gate electrode. The plurality of gold nanostructures contribute to a drain current of the FET based at least in part on plasmonic absorption of photons.

The invention relates to a rapid superjunction longitudinal double-diffusion metal oxide semiconductor transistor which comprises a cell area, a terminal area and a transition area, wherein the terminal area is arranged at the outermost periphery of a chip; the transition area is positioned between the cell area and the terminal area; the bottoms of the cell area, the transition area and the terminal area (III) are provided with drain electrode metal; a heavy doping n-type silicon substrate is arranged on the drain electrode metal and used as a drain area of the chip; an n-type doping epitaxial layer is arranged on the heavy doping n-type silicon substrate; and a discontinuous p-type doping columnar semiconductor area is arranged in the n-type doping epitaxial layer. The rapid superjunction longitudinal double-diffusion metal oxide semiconductor transistor is characterized in that an n-type heavy doping semiconductor area is arranged in a second p-type doping semiconductor area in the transition area, and the surface of the n-type heavy doping semiconductor area is provided with a contact hole which is connected with a metal layer to form a ground contact electrode of the chip. The invention can effectively reduce the reverse recovery charge of a device and improve the reverse recovery characteristics under the conditions of not increasing the process cost or changing the main parameter of the device.

A photovoltaic device is formed by depositing at least a first transparent electrode, PIN-structured or NIP-structured microcrystalline silicon layers, a second transparent electrode, and a back electrode in sequence on an electrically insulating transparent substrate. The PIN-structured or NIP-structured microcrystalline silicon layers include a p-type silicon layer, an i-type silicon layer, and an n-type silicon layer. At least one of the first transparent electrode and the second transparent electrode is a ZnO layer doped with Ga, and the Ga concentration is 15 atomic percent or less with respect to Zn.

An infrared detector includes: a readout wiring portion provided on a semiconductor substrate; a support structure portion disposed over a concave portion formed in a surface portion of the semiconductor substrate, the support structure portion having connection wiring connected electrically to the readout wiring portion; and a cell portion disposed over the concave portion and supported by the support structure portion. The cell portion includes: an infrared absorption layer absorbing incident infrared rays; and a plurality of thermoelectric conversion elements connected electrically to the support structure portion and insulated electrically from the infrared absorption layer to generate an electric signal by detecting a temperature change of the cell portion, each of the thermoelectric conversion elements includes a semiconductor layer, a p-type silicon layer and an n-type silicon layer formed with a space between them in the semiconductor layer, and a polysilicon layer formed on the semiconductor layer between the p-type silicon layer and the n-type silicon layer.

In a semiconductor device of the present invention, the top surface of an n-type silicon carbide layer formed on a silicon carbide substrate is miscut from the (0001) plane in the <11-20> direction. A gate electrode, a source electrode and other elements are arranged such that in a channel region, the dominating current flows along a miscut direction. In the present invention, a gate insulating film is formed and then heat treatment is performed in an atmosphere containing a group-V element. In this way, the interface state density at the interface between the silicon carbide layer and the gate insulating film is reduced. As a result, the electron mobility becomes higher in a miscut direction A than in the direction perpendicular to the miscut direction A.

The invention discloses a process for preparing an n-type solar cell by co-diffusion of boron and phosphorus, which comprises the following steps: making surface texture; screen-printing boron slurry or phosphorus slurry on the surface of a silicon chip, and drying at 100-500°C Dry for 5~30 minutes; according to the self-blocking and out-diffusion characteristics of boron slurry or phosphorus slurry at high temperature, you can choose whether to screen print a layer of barrier layer slurry on it; the active layer is back-to-back for high-temperature boron and phosphorus diffusion; for For n-type silicon wafers printed with boron paste, first diffuse at 880-1100°C for 10-60 minutes, then cool down to 800-950°C, and then inject POCl3 source for phosphorus diffusion for 10-60 minutes; for n-type silicon wafers printed with phosphorous paste BBr3 source was passed into the wafer at a temperature of 880-1100°C for boron-phosphorus co-diffusion for 10-60 minutes; edge isolation and removal of BSG, PSG and barrier layers; double-sided passivation; preparation of electrodes.

The invention relates to a silicon detector structure with a wide spectral response range, which comprises an n-type silicon substrate, a silicon dioxide medium masking layer, a p-type doping layer, a front surface contact electrode, an antireflection film layer, a broad-spectrum absorbing black silicon layer, a medium passivating layer and a back surface contact electrode, wherein a circular groove is arranged on the surface of the n-type silicon substrate; the silicon dioxide medium masking layer is formed around the circular groove on the surface of the n-type silicon substrate, and the middle of the silicon dioxide medium masking layer is an annular structure; the p-type doping layer is arranged in the circular groove of the n-type silicon substrate; the front surface contact electrode is produced on the inner wall of the annular structure of the silicon dioxide medium masking layer and covers the partial edge of the surface of the annular structure to form an annular structure; the antireflection film layer is produced in the annular structure of the front surface contact electrode and covers the surface of the p-type doping layer; the broad-spectrum absorbing black silicon layer is produced on the back surface of the n-type silicon substrate; the medium passivating layer is point-type and is formed on the surface of the broad-spectrum absorbing black silicon layer; and the back surface contact electrode is produced on the surface of the broad-spectrum absorbing black silicon layer and covers the point-type medium passivating layer.