516 results about "Boron doping" patented technology

The invention discloses a fabrication method of a double-side PERC crystalline silicon solar cell. The fabrication method comprises the following steps of (1) removing damage of a silicon wafer, and performing texturing and cleaning; (2) performing diffusion to form a pn junction and performing front-surface laser doping; (3) etching and removing PSG; (4) plating a back-surface passivation thin film; (5) plating a front-surface anti-reflection film; (6) printing boron source paste on a back surface; (7) performing back-surface laser doping and windowing; (8) performing back-surface electrode printing; and (9) performing front-surface electrode printing. A laser doping technology is applied to a process of a selective emitter formed on a front surface and local boron doping on the back surface, only two processes of laser doping and boron source paste printing are added on the basis of a conventional PERC battery process, and the conversion efficiency of the double-side PERC cell is greatly improved; moreover, with the adoption of a secondary printing alignment laser printing MARK point mode, the back-surface metallization of the double-side PERC cell is achieved; and by the method,the problem of difficulty in alignment of a back-surface aluminum grid line to a laser windowing grid line of the silk-screen printed double-sided PERC cell is completely solved.

The invention relates to a modified lithium ion battery ternary positive electrode material and a preparation method of the modified lithium ion battery ternary positive electrode material. The chemical generation formula of the material is as follows: LiNiaCo<1-a-b>MnbBxO2/TiO2, wherein a is more than 0 and less than 1, b is more than 0 and less than 1, (1-a-b) is more than 0 and less than 1, x is more than 0.005 and less than 0.1, and the TiO2 is a cladding layer. The soluble nickel salt, cobalt salt and manganese salt are prepared into a mixed salt solution, the mixed salt solution is reacted with a mixed alkaline solution prepared by mixing the NaOH and ammonium hydroxide, after being filtered, washed and dried, the reaction product is mixed with a boronic compound and roasted for 4h to 12h at the temperature of 300 to 800 DEG C under an air atmosphere, then the roasted product is ball milled with the lithium salt to be uniformly mixed together, the mixture is coated with titanium dioxide after being calcined at the high temperature to obtain the modified lithium ion battery ternary positive electrode material. The prepared boron doping modified ternary positive electrode material is high in specific capacity and good in cycling performance.

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.

The invention discloses a preparation method of a boron-doped diamond (BDD) film electrode taking porous titanium as a matrix. The preparation method is characterized in that the titanium matrix is a porous titanium material with the porosity of 20-50%, hot filament chemical vapor deposition equipment is adopted, and a porous titanium base BDD electrode is prepared through chemical vapor deposition by using a second-order boron concentration control mode. By adopting the method, the generation capacity of TiC is controlled by adjusting boron source concentrations of different stages during chemical vapor deposition, namely the formation of TiC is inhibited by using high boron doping at the initial stage to improve the bonding force between a base and a film, and the boron source concentration is reduced in the later period of reaction to perform low boron doping. The porous titanium base BDD electrode prepared by the method disclosed by the invention is uniform and compact in diamond grain, and the porous titanium matrix is completely covered by a diamond film, so that the electrode has good stability and a relatively wide potential window.

The invention provides a capacitor array structure and a manufacture method thereof. The method includes 1) providing a semiconductor substrate; 2) forming sacrificial layer and support layers in an alternating and stacking manner on the upper surface of the semiconductor substrate; 3) forming graphic mask layers on the upper surfaces of the sacrificial layer and support layers arranged in an alternating and stacking manner, wherein the graphic mask layers have a plurality of holes; 4) forming capacitance holes in the support layers and the sacrificial layers; 5) forming lower electrode layersin the capacitance layers; 6) removing the sacrificial layers and remaining the support layers on the semiconductor substrate; 7) forming capacitance medium layers on the inner surfaces and the outersurface of the lower electrode layers; 8) forming upper electrode layers on the outer surfaces of the capacitance medium layers; 9) forming upper electrode filling layers on the outer surface of theupper electrode layers, wherein the material of the upper electrode filling layers contains boron doped germanium-silicon. According to the invention, temperature of a formation technique can be reduced, so that influence on the capacitance medium layers by thermal budge can be reduced. At the same time, current carrier moving rate can be improved, so that the resistance value of the filling layers can be reduced.

The invention relates to a production method of titanium-based boron-doping diamond coating electrode, the invention is characterized in that the method is realized by sputtering a transition layer on a substrate material and then depositing the boron-doping diamond coating by a CVD method. The electrode is composed of a substrate (1), a transition layer (2) and a diamond layer (3), and is characterized in that the substrate is titanium, the transition layer is niobium or tantalum through magnetron sputtering, and the boron-doping concentration used in the CVD technology is 6000 - 10000 ppm. The invention provides a production method of BDD electrode with long service life and high electrolytic efficiency, and has the advantages of low cost and high repeatability.

The invention provides a fabrication method of a P-type back-surface tunneling oxide passivation contact solar cell. The method comprises the steps of performing previous process processing on a frontsurface and a back surface of a P-type single-crystal silicon wafer; oxidizing the back surface to form an ultrathin tunneling oxide layer and fabricate a boron-doping silicon thin film layer; performing phosphorus diffusion on the front surface of the single-crystal silicon wafer, and fabricating a selective emitter; and printing metal electrodes on surfaces of a first passivation anti-reflection layer on the back surface and a second passivation anti-reflection layer on the front surface of the single-crystal silicon wafer, and forming favorable contact between the metal electrodes and thesingle-crystal silicon wafer, thereby obtaining P-type back-surface tunneling oxide passivation contact of the solar cell. The invention provides a complete and practical P-type tunneling oxide passivation contact solar fabrication process circuit, a process method of first back-surface boron-doping poly-silicon thin film and then front-surface phosphorus diffusion, secondary phosphorus diffusioncan be effectively prevented, so that a phenomenon that square resistance is not matched is generated, and the operability is high.

The invention discloses a silicon-based near infrared photoelectric detector structure which comprises an n type silicon substrate, a phosphorus back field, a sulfur element doping layer, a p type boron doping layer, a see-through surface masking layer, an antireflection film layer, a front contact electrode and a back contact electrode, wherein two layers of step-shaped circular grooves are downwardly arranged above the n type silicon substrate; the phosphorus back field is arranged below the n type silicon substrate; the sulfur element doping layer is arranged in the lower circular groove above the n type silicon substrate; the p type boron doping layer is arranged in the upper circular groove above the n type silicon substrate; the see-through surface masking layer is arranged around the upper circular groove above the n type silicon substrate and covers the periphery of the p type boron doping layer; a circular hole is formed in the middle of the see-through surface masking layer; a ring-shaped groove is arranged at the periphery of the circular hole and the outer diameter of the ring-shaped groove is smaller than the diameter of the upper circular groove above the n type silicon substrate; the antireflection film layer is arranged in the circular hole in the middle of the see-through surface masking layer; the front contact electrode is arranged in the ring-shaped groove on the see-through surface masking layer; and the back contact electrode is arranged below the phosphorus back field. According to the silicon-based near infrared photoelectric detector structure, the difficulty that the traditional silicon photoelectric detectors have weak response to the near infrared lights with wavelengths greater than 1100nm can be solved, and particularly, the high-sensitivity near infrared photoelectric detection for the silicon-based photoelectric detectors can be realized.

The invention discloses a method for boron doping of a crystalline silicon solar battery, which comprises the following steps that: a first layer of film-boron doped silicon oxide film is deposited on the surface of a silicon chip after the wool making, a second layer of film-silicon oxide film is deposited on the first layer of the film to be used as a barrier layer, then the silicon chip is processed at high temperature, so boron atoms can be diffused into a silicon basic body to form a boron doped layer. Due to the adoption of the method, a boron transmission electrode (p+) can be prepared on an n-type silicon chip, or a boron back surface (p+) is formed on a p-type silicon chip. Through the barrier layer, single-faced boron doping can be realized, and a boron source is free from being sucked into a diffusion furnace tube, so the corrosion of the furnace tube can be reduced, and the service life can be prolonged; and if a phosphorus source is introduced during the high-temperature annealing process, the boron doping and phosphorus doping can be respectively realized on two sides of the silicon chip.

The invention discloses a laser boron doped selective emitter TOPCon structure cell and a preparation method thereof. The method comprises the following steps: cleaning and texturing an n-type siliconwafer; during boron diffusion, promoting the formation of a P++ layer with high boron surface concentration without an oxidation process; promoting the doping in a grid line region by laser; after cleaning, putting the n-type silicon wafer back to a diffusion furnace for oxidization to form a selective emitter; removing BSG and a P+ layer on the back, and preparing a tunneling oxide layer and a doped film silicon layer on the back; removing the polycrystalline silicon produced by roll plating on the front and the BSG obtained in step II, and depositing a passivation layer and a SiNx antireflection film on both sides; and screen-printing a double-sided electrode. The preparation method of the invention can not only improve the open circuit voltage of the cell, but also improve the fillingfactor of the cell and finally improve the conversion efficiency of the Topcon solar cell.

The invention belongs to the field of solar photovoltaic industry and particularly provides a double-sided selective emitter efficient crystalline silicon cell and a preparation method thereof. The double-sided selective emitter efficient crystalline silicon cell is characterized in that a double-sided selective emitter structure is adopted, a boron-doped heavily-doped region is a polycrystallinesilicon structure in which aluminum oxide replaces silicon oxide to serve as a tunneling layer, a constant surface concentration increase fill factor (FF) exceeding 1E20atom/cm <3> can be achieved, alightly-expanded region is pure boron doping, a heavily-expanded boron doping process and a lightly-expanded boron doping process can be realized in one step, and the process is simplified. Silicon oxide is adopted as a tunneling layer for a phosphorus-doped region, a heavily-doped region is of a double-layer poly structure, the surface concentration is high, metallization contact is improved, a lightly-expanded region is of a single-layer lightly-doped poly structure, and then the open-circuit voltage (Voc) is increased. The formation of the double-sided selective emitter effectively utilizesa mask etching mode. The double-sided selective emitter efficient crystalline silicon cell is advantaged in that the structure can effectively improve battery efficiency, and is suitable for batch production.

The invention discloses a method for realizing hole local passivation contact, which can realize selective boron doping by adopting printing boron slurry or printing boron ink, and can also realize selective boron doping by selective boron ion implantation, and the boron surface concentration of the formed local boron-doped polycrystalline silicon is not lower than 7E19cm <-3>; and the polycrystalline silicon or amorphous silicon thin film region without local boron doping is etched through alkaline solution chemical etching, and the local boron-doped polycrystalline silicon region is metalized to form the hole local passivation contact structure. Furthermore, the invention also discloses a crystalline silicon solar cell with the hole local passivation contact structure and a correspondingcell preparation method. According to the preparation method of the hole local passivation contact and the preparation method of the corresponding crystalline silicon solar cell, the process is simple, the cost is low, and the industrial potential is good.

The invention relates to a method for preparing a cathode material of a lithium-sulfur battery, and relates to an electrode formed by an active material. The method is characterized in that the graphene oxide reduction, boron doping and solvent thermal reaction are completed by one step, and the cathode material of the lithium-sulfur battery with a boron-doped graphene/sulfur composite three-dimensional structure is prepared by a one-step method. The defects that the cathode material of the lithium-sulfur battery has small and uneven sulfur load content, and low active material load and utilization rate, resulting in poor electrochemical performance of the lithium-sulfur battery in the prior art are overcome.

The invention provides a method for manufacturing a PERT crystalline silicon solar battery by adopting a novel doping mode. The method comprises the steps that texturing is carried out on the single face of a silicon chip, cleaning is carried out, phosphorosilicate glass deposits on the front, borosilicate glass deposits on the back, high-temperature annealing is carried out, n doping layers are formed on the front, p doping layers are formed on the back, plasma edge etching is carried out, the phosphorosilicate glass and the borosilicate glass remaining on the surface of the silicon chip are cleaned and removed, an aluminum oxide/silicon nitride laminating film deposits on the single face of the back, a silicon nitride antireflection film deposits on the front, the film is partially opened from the back so that the boron doping layers can be exposed, a back electrode and an aluminum layer are printed on the back, a silver grid line is printed on the front, and sintering and testing are carried out. The preparing method is simple in step, easy to operate, and capable of efficiently manufacturing the crystalline silicon solar battery in a mass mode, and has the advantages that on the basis of commercialized industrial equipment, conventional battery production equipment possessed by an enterprise production line at present is fully utilized, the equipment investment is greatly reduced, and the manufacturing cost of per watt of the battery is not increased.

There are provided silicon single crystal, silicon wafer, and epitaxial wafer having a sufficient gettering effect suitable for a large-scale integrated device. The silicon single crystal which is suitable for an epitaxial wafer is grown with nitrogen doping at a concentration of 1x1013 atoms/cm3 or more, or with nitrogen doping at a concentration of 1x1012 atoms/cm3 and carbon doping at a concentration of 0.1x1016-5x1016 atoms/cm3 and/or boron doping at a concentration of 1x1017 atoms/cm3 or more. The silicon wafer is produced by slicing from the silicon single crystal, and an epitaxial layer is grown on a surface of the silicon wafer to produce the epitaxial wafer. The present invention provides an epitaxial wafer for a large-scale integrated device having no defects in a device-active region and having an excellent gettering effect without performance of an extrinsic or intrinsic gettering treatment, which is a factor for increasing the number of production steps and production costs.

An object of the present invention is to provide an epitaxial wafer on which dislocation is preventable even when a LSA treatment is performed in device processes. An epitaxial wafer according to the present invention includes a wafer 11 whose nitrogen concentration is 1×10¹² atoms/cm³ or more or whose specific resistance is 20 mΩ·cm or less by boron doping, and an epitaxial layer 12 provided on the wafer 11. On the wafer 11, if a thermal treatment is performed at 750° C. for 4 hours and then at 1,000° C. for 4 hours, polyhedron oxygen precipitates grow predominantly over plate-like oxygen precipitates. Therefore, in the device processes, plate-like oxygen precipitates cannot be easily formed. As a result, even when the LSA treatment is performed after various thermal histories in the device processes, it is possible to prevent the dislocation, which is triggered by oxygen precipitates, from generating.

The invention provides a boron-doped nanocrystalline diamond film. The boron-doped nanocrystalline diamond film is prepared by using the following steps of: preparing a boron-doped nanocrystalline diamond film on a monocrystalline silicon substrate by adopting a CVD (Chemical Vapor Deposition) method and annealing the film in vacuum at 800-1200 DEG C for 30-60 min to obtain the boron-doped nanocrystalline diamond film. By using the vacuum annealing method, the invention ensure that boron atoms aggregated on a grain boundary of the nanocrystalline diamond film are dispersed into nanocrystalline diamond grains and the amount of trans-polyacetylene on the grain boundary is greatly reduced, thereby effectively improving the p-type conductive performance and the electrochemical performance of the boron-doped nanocrystalline diamond film. The invention has very important scientific meaning and engineering values to the application of the boron-doped nanocrystalline diamond film in nano-electronic devices and the electrochemical field, such as water treatment, heavy metal detection, and the like.

The invention relates to a preparation method of boron-doping carbon nitride as well as a product and application thereof. By virtue of a hydrothermal reaction way of melamine and boric acid, on one hand, boron atoms have chemical reaction with melamine, so that the boron and carbon-nitrogen elements are mixed in an atomic level; on the other hand, the hydrothermal reaction is performed for the melamine in an acid environment, so that a supermolecule-like structure is formed, and the separation of a carbon nitride lamina structure in the subsequent roasting process can be facilitated; and a precursor synthesized in the reaction is roasted to prepare boron-doped carbon nitride which is uniform in doping and has a thinner lamina structure. The boron-doping carbon nitride prepared by adoptingthe preparation method of the invention is uniform in element doping, thinner in lamina, better in optical catalysis, simple in preparation operation, low in difficulty and suitable for enlarged production.

The invention relates to a method for improving heat conductivity of a carbon/carbon compound material, and belongs to the technical field of carbon/carbon compound material preparation. According to the method, mesophase pitch with high orientation characteristics is adopted for replacing original general pitch or resin to serve as a base body carbon precursor, and boron-doped graphene is added into the mesophase pitch to serve as a heat-conducting additive for further improving the heat conductivity of the carbon/carbon compound material, wherein the orientated flowing of the mesophase pitch can realize that the orientations of a sheet layer of graphene and base body carbon are basically the same, and the overall graphitization degree of the material can be increased at a lower temperature due to doping of a graphitization catalyst-boron; boron and graphene are bonded together and a catalytic graphitization mechanism of boron is that the overall graphitization degree of the material is increased by making up dimensional structure defects in the carbon material, so that a new boron catalyst/base body carbon interface cannot be introduced in a boron doping process, but the compatibility and the bonding strength of base body carbon of the mesophase pitch and graphene can be effectively improved.