29results about How to "High doping" patented technology

The invention provides a low-on-resistance trench gate silicon carbide VDMOS and a preparation method thereof, and the method comprises the steps: depositing metal on the lower side surface of a silicon carbide substrate, and forming a drain metal layer; epitaxially growing on the upper side surface of the silicon carbide substrate to form a drift layer; performing ion implantation to form a low-resistance region; forming a barrier layer, etching, performing ion implantation, and forming a P + well region, a P-type well region and an N-type source region; a barrier layer is formed again, and the insulating medium is etched and deposited; forming a barrier layer again, etching and depositing metal, and forming a suspension gate; forming a barrier layer again, etching the barrier layer, and depositing to form an insulating medium layer; forming a barrier layer again, etching and depositing metal, and forming a gate metal layer; the barrier layer is re-formed, the barrier layer is etched to form a through hole, the drift layer is etched to the upper side face of the P-type well region, metal is deposited, a source electrode metal layer is formed, the barrier layer is removed, preparation is completed, gate-drain capacitance is reduced, the switching speed of the device is increased, and switching loss is reduced.

The invention relates to a fly ash sintered material with high fly ash mixing amount and a preparation method and application thereof. The method comprises the following steps: uniformly mixing silicon powder, alkali, water and a dispersing agent, and stirring and reacting at 75-95 DEG C for 4-12 hours to obtain a special silicon aggregate solution; uniformly mixing a sintering aid and the waste incineration fly ash to obtain solid powder, and then putting the solid powder and the special silicon aggregate solution into a forming and granulating device for forming and granulating to obtain formed particles; the waste incineration fly ash is calcined for 0.2-1.2 h in high-temperature treatment equipment at the temperature of 600-900 DEG C, the fly ash sintered material is obtained, the mass fraction of the waste incineration fly ash in the fly ash sintered material is 70-85%, and the mass fraction of the sintering aid is 2-5%; according to the method, the high doping amount of the waste incineration fly ash can be achieved in the fly ash sintering heat treatment process, the sintering temperature can be reduced, and the fly ash sintered material with the heavy metal leaching toxicity reaching the standard and the strength reaching the standard can be obtained by conducting low-temperature sintering treatment on the waste incineration fly ash with the high fly ash doping amount.

This invention discloses a nitrogen-phosphorus-boron-iron co-doped coconut shell activated carbon carrier, its preparation method, and its application. The method includes the following steps: S1, pulverizing coconut shell activated carbon and activating it with Ar / steam to obtain pretreated activated carbon; S2, mixing chitosan solution and urea solution, adding phytic acid, adjusting the pH to 5.5-6.0, and stirring to obtain a wetting agent; S3, adding the pretreated activated carbon to the wetting agent, heating, stirring, then filtering, washing, and vacuum drying to obtain nitrogen-phosphorus pre-activated activated carbon; S4, dissolving ferric ammonium citrate and sodium citrate in deionized water, adding ethylene glycol, stirring, then adding the nitrogen-phosphorus pre-activated activated carbon, heating, stirring again, then adding a potassium borohydride mixed solution dropwise, and calcining to obtain a nitrogen-phosphorus-boron-iron co-doped coconut shell activated carbon carrier. The nitrogen-phosphorus-boron-iron co-doped coconut shell activated carbon carrier provided by this invention, after loading a metal catalyst, can solve the common problems of low conversion rate and poor selectivity in nitro hydrogenation reactions.

The invention relates to the field of batteries, in particular to a ternary positive electrode material as well as a preparation method and application thereof. The preparation method of the ternary positive electrode material comprises the following steps: (a) carrying out primary sintering and crushing on a mixed system containing a lithium source, a ternary precursor and a first doping element; (b) carrying out secondary sintering on a mixed system containing the crushed product and a coating agent; and (c) carrying out tertiary sintering on a mixed system containing a product obtained after secondary sintering and a second doping element to obtain the ternary positive electrode material. The preparation method of the ternary positive electrode material is simple and does not need to depend on harsh equipment or conditions, and the prepared ternary positive electrode material has high power and high stability and can show excellent low-temperature charging and discharging performance in a low-temperature environment.

The embodiment of the invention provides an N-type IBC battery negative electrode grid line silver paste, an N-type IIBC battery and a preparation method thereof, the N-type IBC battery negative electrode grid line silver paste provided by the embodiment of the invention comprises an organic auxiliary agent, silver powder, an organic binder and doped glass powder, and the doped elements of the doped glass powder are antimony, tellurium and tungsten. The antimony, tellurium and tungsten elements are doped in the glass powder, and the antimony element and phosphorus are pentavalent elements, so that the doping of an N region can be increased; the tellurium and the tungsten have a silver dissolving effect, so that the contact resistivity of the silver grid line can be reduced, the filling factor is improved, and the photoelectric conversion efficiency of the cell is improved; therefore, the problem that the photoelectric conversion efficiency of the N-type IBC battery is poor due to the fact that an n + region cannot be formed in an existing N-type IBC battery is solved.

The invention discloses a preparation method of a loose body based on an optical fiber preform, and relates to the technical field of optical fiber processing. The method comprises the following steps: SS01, depositing a barrier layer by adopting an MCVD (modified chemical vapor deposition) process; sS02, multi-time deposition of a loose core layer is conducted through the MCVD deposition technology; sS03, preparing a doping solution containing rare earth ions and aluminum ions; sS04, off-line solution doping is carried out, and a vacuum pressurization alternate driving mode is adopted in the doping process. The porosity of the loose core layer is gradually reduced from inside to outside, a permeation resistance gradient is formed, the high porosity of the inner layer provides sufficient permeation channels, the low porosity of the outer layer plays a role of a barrier layer, rare earth ions are prevented from being adsorbed by the surface layer too early and exhausted in the doping process, and the rare earth ions are prevented from being adsorbed by the surface layer too early and exhausted through the forced permeation effect of vacuum pressurization alternate driving. Dissolved gas is discharged through vacuumizing operation after each stage of pressurization, space is vacated for next-stage permeation, and the rare earth ions are evenly distributed in the radial direction of the loose body.

This invention discloses a method for preparing functional carbon materials with atomically dispersed Lewis acid-base sites, comprising: (1) polymer preparation to obtain a polymer sample; (2) polymer modification to obtain a modified polymer sample; (3) polymer carbonization: the modified polymer sample is heat-treated in a non-oxidizing atmosphere to carbonize the modified polymer sample; after carbonization, the system is naturally cooled; then, after washing and drying, the target functional carbon material is obtained. This invention utilizes atomically dispersed Lewis acidic metal sites and basic N sites to modify carbon materials in situ. The prepared functional carbon material has a large specific surface area, well-developed pore structure, abundant acid-base sites, and an atomically distributed structure, which can significantly improve the density of functional sites on the surface of the carbon material and its adsorption efficiency for boron, phosphorus, and metal impurities. Its application in the purification of chlorosilanes can greatly reduce the load of subsequent distillation and impurity removal, and improve the yield and quality of high-purity chlorosilanes.

The present application relates to the field of NdFeB magnets, and specifically to a magnet remanufactured using waste NdFeB magnets and its preparation process. A preparation method for remanufactured magnets using waste NdFeB magnets, comprising: preliminary crushing and analysis, preparation of magnetic powder, mixing and sintering and tempering, wherein magnetic powder is prepared using waste NdFeB magnets, and then nano-gallium nitride and nano-aluminum carbide are added to the magnetic powder and mixed evenly to obtain a mixed powder, which is then sintered at high temperature and heat treated. In the present application, nano-gallium nitride gradually decomposes during sintering, increases the liquid phase content, promotes the doping of nano-aluminum carbide into the grain boundary, and improves the magnetic properties of the remanufactured magnet; and nano-aluminum carbide can enhance the chemical stability of the neodymium-rich phase, thereby further improving the corrosion resistance of the remanufactured magnet; compared with the prior art, the present application effectively improves the utilization rate of waste NdFeB magnets on the basis of maintaining the magnetic properties of the remanufactured magnet, and improves the corrosion resistance of the remanufactured magnet.

The invention discloses a preparation method of a Ti4O7 doped high-emissivity film layer. The method comprises the following steps: 1, cleaning and drying a substrate; secondly, after the mask plate and the base body are attached, multi-arc ion plating deposition is carried out; 3, micro-arc oxidation; and 4, putting the substrate subjected to micro-arc oxidation into a hydrothermal solution containing Ti4O7 nanoparticles for hydrothermal treatment, and washing, drying and curing to obtain the substrate with the Ti4O7 doped high-emissivity film layer. The composite film layer is prepared by combining multi-arc ion plating, micro-arc oxidation and hydro-thermal treatment processes, the specific surface area and roughness of a matrix are increased by constructing a convex columnar array structure through multi-arc ion plating, and a large number of Ti4O7 nanoparticles are promoted to deposit into the film layer prepared through micro-arc oxidation through hydro-thermal treatment, so that the emissivity of the film layer is greatly improved; and the film is high in film-substrate binding force and high in high-temperature resistance, and is suitable for the field of heat dissipation of key structural parts of aerospace ion electric propulsion.

The preparation method of the carbon material catalytic electrode material provided by the present invention can form a core-shell structure in which the core is a metal-N-doped carbon core with a low surface work function and the shell is a MAX semiconducting phase, the core or small microsphere inside the core-shell structure has a low surface work function, forming a high catalytic carbon core, and can prevent the direct contact between the catalytic carbon core and the electrolyte, greatly reducing the shedding of metal-doped atoms and the occurrence of side reactions, the outer polymer large microsphere inherits the topological structure of the phenolic-phenolic amine-pyrrole polymer, can effectively regulate the carbonization reaction process of the conjugated skeleton, and the side chain carbon formed while the shell directly constructs a developed pore structure can further selectively adsorb and desorb the reactant, greatly improving the catalytic efficiency of the electrocatalytic material. Thereby, the catalytic electrode material finally prepared produces a large current density and a high Faraday efficiency at a low overpotential, and can ensure that the catalytic electrode material has high mechanical strength.

This application relates to the field of solar cell technology, providing an aluminum paste and its manufacturing method, a PERC cell, a module, and a system. The manufacturing method of the aluminum paste for PERC cells includes: preparing a boron-aluminum-silicon composite oxide; adding the boron-aluminum-silicon composite oxide to a glass base material to form a glass raw material; and using the glass raw material to prepare the aluminum paste. Thus, because the glass raw material of the aluminum paste includes the boron-aluminum-silicon composite oxide, boron can be better retained in the laser-drilled grooves, increasing the doping of the back electric field, thereby improving the back passivation effect of the PERC cell and contributing to improved photoelectric conversion efficiency.

The embodiment of the invention provides an N-type IBC battery positive electrode grid line silver-aluminum paste, an N-type IBC battery and a preparation method thereof, and the N-type IBC battery positive electrode grid line silver-aluminum paste provided by the embodiment of the invention comprises an organic auxiliary agent, silver powder, aluminum powder, boron powder, gallium powder, an organic binder and glass powder. The silver powder, the boron powder and the gallium powder are added into the positive electrode grid line slurry, the slurry is directly printed on the passivation layer area above the p + doped area, and then high-temperature sintering is carried out, so that the slurry can be in contact with the p + doped area to form the positive electrode grid line, the step of secondary laser grooving is omitted, the passivation layer is prevented from being damaged by secondary laser grooving, and the service life of the positive electrode grid line is prolonged. The formation of a metal recombination center is reduced, and the open-circuit voltage of the battery can be improved.

The invention discloses a preparation method and application of heteroatom-doped anthracite-based carbon spheres, and relates to the technical field of water system symmetric supercapacitor electrode materials. According to the preparation method of the heteroatom (nitrogen, oxygen, boron and phosphorus)-doped anthracite-based carbon sphere and the application of the electrode material in the water system symmetric supercapacitor, the heteroatom (nitrogen, oxygen, boron and phosphorus)-doped anthracite-based carbon sphere is prepared by taking anthracite and an organic polymer containing a heteroatom functional group as carbon sources through an organic copolymerization reaction, so that the heteroatom (nitrogen, oxygen, boron and phosphorus)-doped anthracite-based carbon sphere is obtained. And the obtained polymer is subjected to a one-step high-temperature carbonization-inorganic matter activation pyrolysis process to obtain the water system symmetric supercapacitor carbon-based electrode material. The heteroatom (nitrogen, oxygen, boron and phosphorus) doped anthracite-based carbon sphere prepared by the method has the characteristics of high heteroatom doping amount and simple preparation process, and is suitable for popularization and application in the field of energy storage by simulating and representing the rapid charge / discharge and long-term cycle stability of the water system symmetric supercapacitor electrode material.

This invention relates to the field of secondary battery technology, and discloses an inorganic superionic conductor material, its preparation method, and its applications. The inorganic superionic conductor material comprises apatite and dopant ions doped into the apatite; wherein the dopant ions include metal cations and non-metal anions. The inorganic superionic conductor material provided by this invention can be used as a modified filler to achieve synergistic effects on electrolyte mechanical and electrochemical performance. Simultaneously, it can be introduced as a modifier into iodine cathodes to activate the 4-electron reaction of the iodine cathode, and introduced into bromine cathodes to stabilize the redox reaction of bromine, reducing bromine loss, thereby significantly improving the capacity and cycle stability of the full battery. Furthermore, by using 3D printing technology, screen printing, digital light processing, and fused deposition modeling, the inorganic superionic conductor material can be assembled with interdigitated positive and negative electrodes into flexible batteries, exhibiting excellent application effects when integrated with flexible LEDs.

The present application relates to a p-type AlGaN material and a preparation method thereof, and a preparation method of an ultraviolet photoelectronic device, and belongs to the field of semiconductor technology. The preparation method of the p-type AlGaN material comprises: introducing an organic metal source and an N source at a first temperature to grow the p-type AlGaN material; pausing the introduction of the organic metal source and maintaining the temperature at a second temperature for a certain period of time to allow some Ga atoms in the p-type AlGaN material to escape, thereby generating cation vacancies in the p-type AlGaN material; wherein the second temperature is higher than the first temperature, and the difference between the second temperature and the first temperature ranges from 20°C to 200°C. Thus, the hole concentration of the p-type AlGaN material is increased.

The invention discloses a preparation method of a nickel-manganese-titanium-zinc sodium ion battery positive electrode material precursor. The specific process comprises the following steps: simultaneously adding a nickel-manganese mixed salt solution, a titanium complexing solution, a zinc-ammonia complexing solution and an alkali solution into a reaction kettle containing a kettle bottom solution through four feeding pipes, and carrying out a co-precipitation reaction to prepare a nickel-manganese-titanium-zinc sodium ion battery positive electrode material precursor; the method can realize simultaneous precipitation of four metal ions of Ni < 2 + >, Mn < 2 + >, Ti < 4 + > and Zn < 2 + >, elements in the obtained precursor are uniformly distributed, the molar ratio completely meets a target value, and the nickel-manganese-titanium-zinc sodium ion battery positive electrode material precursor prepared by the method is uniform in morphology, good in consistency, high in tap density, uniform in element distribution and free of segregation.

The invention discloses a ruthenium oxide nano material doped with two or more than two p-region metals and / or transition metals. The molecular formula of the ruthenium oxide nano material is one of the following types: type I: two or more than two p-region metal doped ruthenium oxide nano materials P < 1 > x < 1 > P < 2 > x < 2 >... P < n > x < n > Ru < 1-x-x < 2 >...-x < n > O < 2 >; or the type II is as follows: two or more than two transition metal doped ruthenium oxide nano materials T < 1 > y < 1 > T < 2 > y < 2 >... T < n > y < n > Ru < 1-y < 1-y < 2 >...-y < n > O < 2 >; or a type 3: a ruthenium oxide nanomaterial P < 1 > x < 1 > P < 2 > x < 2 >... P < n > x < n > T < 1 > y < 1 > T < 2 > y < 2 >... T < n > y < n > Ru < 1-x-x-x-2 >...-x < n >-y < 1-y > 2...-y < n > O < 2 > co-doped with the p-region metal (P) and the transition metal (T); wherein P < 1 > x < 1 >, P < 2 > x < 2 >,..., P < n > x < n > are p-region metal, and the p-region metal is selected from one or more of gallium, indium, germanium, tin, lead, antimony and bismuth; t1y1, T2y2,..., Tnyn are transition metals, and the transition metals are selected from one or more of titanium, zirconium, hafnium, cadmium, vanadium, niobium, tantalum, chromium, molybdenum, tungsten, manganese, rhenium, iron, cobalt, nickel, copper, zinc, palladium, osmium, cerium and praseodymium. The invention also discloses a preparation method of the nano material and application of the nano material in an electrode material.

The invention provides a pyroelectric ceramic material and a preparation method thereof, and belongs to the technical field of pyroelectric material preparation, the preparation method comprises the following steps: taking Pb3O4, ZrO2, TiO2, Nb2O5, MnO2, Sb2O3 and Al2O3 as raw materials, adding Zr balls to carry out primary ball milling, then drying and pre-sintering, adding Zr balls into the obtained intermediate material to carry out secondary ball milling, and then successively carrying out granulation, dry pressing molding, sintering, silver coating and polarization to obtain the pyroelectric ceramic material. The pyroelectric ceramic material is prepared. By adjusting the formula and the preparation process of the pyroelectric ceramic material, the performance of the pyroelectric ceramic material is optimized, so that the pyroelectric ceramic material has better comprehensive performance, the performance is more stable, and the requirement of the infrared detection market for the comprehensive performance of the material is met.

The invention discloses a metal-fluorine co-doped carbon composite material rich in monatomic sites as well as a preparation method and application of the metal-fluorine co-doped carbon composite material. According to the material, trifluoroacetic acid is particularly adopted as a fluorine source, and the density of monatomic sites is improved by increasing the fluorine doping amount. In the preparation process, triethylamine is added to provide an alkaline environment, and the yield is improved. The carbon material prepared by the preparation method provided by the invention has more excellent conductivity.

The invention discloses a method for preparing a multidimensional carbon-based iron nanocatalyst, with polyaniline as a carrier, through planetary high-energy ball milling, the iron phthalocyanine molecule is partially destroyed, the generated fragments or degradation products are loaded in the polyaniline structure, and the fixing and dispersion effect is played, and the ethylene glycol therein is used as both abrasive and protective agent for iron fragments; the dicyandiamide added subsequently forms carbon nanotubes with iron nanoparticles during high-temperature pyrolysis, and the carbon in the iron phthalocyanine forms carbon nanosheets with dicyandiamide, forming a multidimensional carbon-based iron nanocatalyst; dicyandiamide also increases the doping amount of nitrogen in carbon nanotubes and carbon nanosheets, greatly enriching active sites such as Fe-N and Fe-N-C. The present invention is a new method for preparing a multidimensional carbon-based iron nanocatalyst, and the process is simple, the conditions are easy to control, and the product has excellent oxygen reduction reaction electrocatalytic activity, and has a wide range of application prospects in electrochemical new energy fields such as fuel cells and metal-air batteries.

The invention relates to the field of building materials, in particular to sludge ash for concrete and a preparation method and application thereof. The sludge ash for the concrete contains the following components in percentage by mass: 10 to 15 percent of Al2O3, 15 to 25 percent of Fe2O3, 30 to 40 percent of SiO2 and 15 to 20 percent of CaO. The problems that phase components are unreasonable and the hydration reaction effect is poor when the sludge ash for the concrete is directly applied to concrete preparation are solved, the sludge ash for the concrete is used for 100% replacement of fly ash, the doping amount of the sludge ash in cement-based concrete reaches up to 60%, and the cement-based concrete can be recycled. The technical effects of high compressive strength and high breaking strength of the concrete can be achieved, and resource reutilization of sludge waste pollutants is achieved while the use cost of the concrete is reduced.

The invention relates to a universal method for synthesizing silicon oxide nanoparticle doped dye and drug molecules by utilizing coprecipitation. In the reaction system provided by the invention, tetraethyl orthosilicate is used as a synthetic raw material, and a universal method suitable for doping dye molecules and drug molecules is provided. The method shows that 98 dyes and drug molecules can be directly doped into the silicon oxide nanoparticles. The reaction is simple and convenient, substances involved in the reaction have good biocompatibility, dye molecules and drug molecules can be efficiently doped into the silicon oxide nanoparticles, and the morphology and a certain doping rate of the silicon oxide nanoparticles can be ensured by regulating and controlling synthesis parameters according to the determined synthesis proportion. The method can be used as a safer and more efficient platform technology to dope various dye molecules and drug molecules into the silicon oxide nanoparticles, and the special microenvironment of the silicon oxide nanoparticles can better protect the dye molecules and drug molecules from being damaged by a harsh environment.

The invention relates to the technical field of organic solid waste recycling, in particular to adsorption cross-linking-reductive amination reinforced iron-nitrogen-doped high-catalytic-performance sludge biochar and a preparation method of the adsorption cross-linking-reductive amination reinforced iron-nitrogen-doped high-catalytic-performance sludge biochar. The preparation method comprises the following steps: performing pretreatment and preliminary pyrolysis on sludge to obtain sludge biochar; carrying out oxidation alkali washing on the sludge biochar to obtain hydrophilic biochar; mixing the hydrophilic biochar with polyethyleneimine and ferric salt for adsorption crosslinking, then adding a reducing agent in an inert atmosphere for reductive amination reaction, and then performing secondary pyrolysis in the inert atmosphere to obtain the sludge biochar with high catalytic performance. According to the invention, efficient utilization and atomic-scale close synergy of iron and nitrogen elements are realized, and a high-proportion FexN active site is formed in the biochar. When the prepared biochar activates peroxymonosulfate to degrade antibiotic wastewater, the biochar shows high catalytic activity and removal efficiency which are obviously superior to those of a traditional method, and a catalyst with excellent performance is provided for treating refractory organic wastewater by using waste to treat waste.

The application discloses a preparation method of a buried heterojunction for a distributed feedback laser, which can reduce the threshold current of a laser, greatly improve the consistency of a device and has strong process compatibility. The method introduces a selective Zn diffusion treatment process step after growing a buried layer on a top cladding layer. A high-concentration p-type region formed through the diffusion step can form a more ideal ohmic contact with a metal electrode. In addition, an extra thin gold layer with a thickness of 5-10 nm is evaporated on the top cladding layer, which can significantly reduce the ohmic contact. The ohmic contact is reduced from 1.2e ‑5 to 4.5e ‑7 , about 26.6 times. In addition, while reducing the ohmic contact, the current limiting effect is significantly enhanced. The threshold current of the laser prepared by the method can be reduced to 15-18 mA. In addition, the method has low process difficulty, high operability, high freedom and greatly improved device consistency. Moreover, the method has strong process compatibility. The method is suitable for popularization and application in the field of semiconductor lasers.

A positive electrode active material for a lithium secondary battery according to an embodiment of the present disclosure includes a lithium transition metal oxide containing nickel (Ni), cobalt (Co), manganese (Mn), strontium (Sr), and sulfur (S). The mole fraction of nickel in the total mole number of nickel, cobalt, and manganese in the lithium transition metal oxide is 0.8 or more. The molar ratio of cobalt to manganese in the lithium transition metal oxide is 0.9 to 1.5. The molar ratio of strontium (Sr) to sulfur (S) in the lithium transition metal oxide is greater than 0 and 4 or less. Provided is a lithium secondary battery including a positive electrode active material for a lithium secondary battery, providing improved life stability and high capacity / power.

The invention provides a sodium niobate-based energy storage ceramic material and a preparation method thereof. The general chemical formula of the ceramic material is (1-x) (0.6 NaNbO < 3 >-0.4 Sr < 0.7 > Bi < 0.2 > Mg < 1 / 3 > Nb < 2 / 3 > O < 3 >)-xBaTiO < 3 > (I), in the formula (I), x is mole fraction, and x is more than or equal to 0.05 and less than or equal to 0.20. The material is prepared by sintering a NaNbO3-Sr0. 7Bi0. 2Mg1 / 3Nb2 / 3O3 substrate material and a BaTiO3 material through a solid-phase reaction method. The (1-x) (0.6 NaNbO3-0. 4Sr0. 7Bi0. 2Mg1 / 3Nb2 / 3O3)-xBaTiO3 ceramic material prepared by the preparation method disclosed by the invention not only has high polarization intensity and high breakdown strength, but also has extremely high energy storage density. The ceramic material is lead-free environment-friendly excellent energy storage ceramic, the performance of the ceramic material is obviously superior to that of other system ceramics, and the application requirements of the ceramic material in the aspects of pulse dielectric capacitors and the like can be met.

The invention discloses an aluminum nitride detector with a full-vertical structure and a preparation method of the aluminum nitride detector. The aluminum nitride detector comprises an aluminum nitride substrate, a first semiconductor and an anode metal laminated layer which are arranged on the upper surface of the substrate, and a second semiconductor and a cathode metal laminated layer which are arranged on the lower surface of the substrate, ohmic contact electrodes are formed on the surfaces of the first semiconductor and the second semiconductor respectively, and mesa terminals are formed on the surfaces, not covered by the ohmic contact electrodes, of the first semiconductor and the second semiconductor and the upper surface and the lower surface of the aluminum nitride substrate in an etching mode. After bias voltage is applied to the full-vertical MSM structure, full collection of energy of high-energy particles is realized; the aluminum-gallium-nitrogen interface layers are introduced to the front surface and the back surface of the aluminum nitride substrate at the same time to realize excellent ohmic contact, so that the sensitivity and the energy collection rate of the aluminum nitride high-energy particle detector are improved; and the mesa terminal is prepared by etching the groove in the area outside the active area, so that electric leakage is reduced, and the energy resolution of the aluminum nitride high-energy particle detector is further improved.

The invention relates to a preparation method of a Zr-doped RuO2 acidic water electrolysis anode catalyst, which can be realized only by means of room-temperature stirring and subsequent low-temperature annealing: firstly, sufficiently dissolving a metal precursor under a stirring condition, then evaporating a solvent in a vacuum drying oven, and centrifugally washing solid powder for several times; finally, the dried solid powder is placed in a muffle furnace to be annealed, a crucible is taken out to be naturally cooled, and the Zr-doped RuO2 acidic water electrolysis anode catalyst can be obtained. Compared with an existing preparation method, the preparation method provided by the invention is simple and easy to implement, mild in reaction condition, easy to control, high in repeatability and suitable for large-scale production, and solves the technical problems of high cost, complicated process flow, difficulty in batch synthesis and the like of an electrolytic water catalyst in the prior art; the prepared catalyst shows remarkably enhanced catalytic activity and stability in acidic water electrolysis as an anode material, is superior to self-made RuO2 and commercial RuO2, shows good application potential in large-scale water electrolysis, and has a relatively high industrial research prospect.

The invention relates to a p-type AlGaN material and a preparation method thereof, and a preparation method of an ultraviolet electronic device, and belongs to the technical field of semiconductors, and the preparation method of the p-type AlGaN material comprises the following steps: at a first temperature, introducing an organic metal source and an N source, and growing the p-type AlGaN material; stopping introducing the organic metal source, and keeping for a certain time at a second temperature to enable part of Ga atoms in the p-type AlGaN material to escape so as to generate cation vacancies in the p-type AlGaN material; wherein the second temperature is higher than the first temperature, and the difference between the second temperature and the first temperature ranges from 20 DEG C to 200 DEG C. Therefore, the hole concentration of the p-type AlGaN material is improved.