110 results about "Oxygen precipitation" patented technology

A substrate contains dissolved oxygen at a concentration of not more than 8×1017 atoms / cm3 and an impurity which is used as an acceptor or donor at a concentration of not more than 1×1015 atoms / cm3. In the substrate, an oxygen precipitation layer used to suppress occurrence of a slip starting from the rear surface of the substrate is formed. On the substrate, a silicon layer in which circuit elements are formed and which contains dissolved oxygen with at concentration of not more than 8×1017 atoms / cm3 and an impurity which is used as an acceptor or donor at a concentration of not more than 1×1015 atoms / cm3 is formed.

The invention relates to a porous nitrogen-doped carbon supported cobalt nano-material, a preparation method and application thereof. The preparation method comprises the steps of dissolving a cobaltsource in a sodium citrate solution, having a hybrid reaction with cobalt potassium cyanide to obtain a Prussian blue similar nanocube; mixing and stirring with a dopamine aqueous solution in a buffering solution to obtain a dopamine coated cobalt-based Prussian blue composite material; after drying, annealing and roasting at a high temperature; then adding inorganic acid in a reaction kettle foracid-pickling to obtain the porous nitrogen-adopted carbon supported cobalt nano-material. The result shows that the material has a relatively good electronic transmission performance, a huge specificsurface area, good stability and many active site, has relatively good electrocatalytic activity in alkaline electrolyte and can serve as a three-function catalyst for oxygen precipitation, hydrogenprecipitation and oxygen reduction reaction.

The invention relates to a high-load precious metal monatomic catalyst as well as a preparation method and application of the high-load precious metal monatomic catalyst. The high-load precious metalmonatomic catalyst is prepared by adsorbing precious metal acid radical ions or salt ions by taking a nitrogen-doped carbon material as a carrier, and then, radiating the obtained precursor powder byusing ultraviolet with a certain strength for a period of time. The catalyst has high active site density and high precious metal utilization ratio and shows excellent performances in reactions such as electrically-catalyzed hydrogen precipitation, oxygen reduction and oxygen precipitation.

The invention relates to electrochemical power sources and the field of electrochemical catalysis, and particularly relates to a transition metal nitride / carbon electrocatalyst. The transition metal nitride / carbon electrocatalyst comprises a substrate and a shell, the substrate is coated by the shell, and the shell comprises copper nitride and further comprises a carbon material or a nitrogen doped carbon material. The invention further provides a preparation method of the electrocatalyst, and the electrocatalyst is prepared by forming MOF of copper in advance, then further aminating and calcining through one step, and preparing the electrocatalyst. The processes of oxygen precipitation and hydrogen precipitation show the low overpotential in the alkaline environment, and the electrocatalyst can be used as a catalyst material of alkaline efficient electrolysed water.

A process for imparting controlled oxygen precipitation behavior to a single crystal silicon wafer. Specifically, prior to formation of the oxygen precipitates, the wafer bulk comprises dopant stabilized oxygen precipitate nucleation centers. The dopant is selected from a group consisting of nitrogen and carbon, and the concentration of the dopant is sufficient to allow the oxygen precipitate nucleation centers to withstand thermal processing, such as an epitaxial deposition process, while maintaining the ability to dissolve any grown-in nucleation centers.

The present invention relates to a process for forming single crystal silicon ingots or wafers that contain an axially symmetric region in which vacancies are the predominant intrinsic point defect, that are substantially free of oxidation induced stacking faults, and are nitrogen doped to stabilize oxygen precipitation nuclei therein.

This invention generally relates to a process for suppressing oxygen precipitation in epitaxial silicon wafers having a heavily doped silicon substrate and a lightly N-doped silicon epitaxial layer by dissolving existing oxygen clusters and precipitates within the substrate. Furthermore, the formation of oxygen precipitates is prevented upon subsequent oxygen precipitation heat treatment.

A method for controlling oxygen precipitation in a single crystal silicon wafer having a wafer resistivity of less than about 10 milliohm-cm is provided so that the wafer has uniformly high oxygen precipitation behavior from the central axis to the circumferential edge. The single crystal silicon wafer comprises an additional dopant selected from among carbon, arsenic, and antimony.

A process for imparting controlled oxygen precipitation behavior to a single crystal silicon wafer. Specifically, prior to formation of the oxygen precipitates, the wafer bulk comprises dopant stabilized oxygen precipitate nucleation centers. The dopant is selected from a group consisting of nitrogen and carbon, and the concentration of the dopant is sufficient to allow the oxygen precipitate nucleation centers to withstand thermal processing, such as an epitaxial deposition process, while maintaining the ability to dissolve any grown-in nucleation centers.

Nitrogen-doped CZ silicon crystal ingots and wafers sliced therefrom are disclosed that provide for post epitaxial thermally treated wafers having oxygen precipitate density and size that are substantially uniformly distributed radially and exhibit the lack of a significant edge effect. Methods for producing such CZ silicon crystal ingots are also provided by controlling the pull rate from molten silicon, the temperature gradient and the nitrogen concentration. Methods for simulating the radial bulk micro defect size distribution, radial bulk micro defect density distribution and oxygen precipitation density distribution of post epitaxial thermally treated wafers sliced from nitrogen-doped CZ silicon crystals are also provided.

The invention discloses a nanometer metal / carbon composite material as well as a preparation method and application thereof. According to the nanometer composite material, amorphous carbon spheres serve as a skeleton, metal elements are embedded in a carbon layer uniformly, and spherical granules with the granularity of 100 to 500 nm are formed. The amorphous carbon sphere has a loose and porous structure, the specific surface area is between 300 m<2> / g and 1000 m<2> / g, and the grain diameter of the quantum metal elements is between 3 nm and 10 nm. The porous structures in the amorphous carbonspheres provide a large amount of active sites and are favorable for performing oxygen adsorption and precipitation kinetics reaction; meanwhile, the metal elements embedded in the carbon layer can improve the catalytic activity of carbon material oxygen precipitation. The nanometer composite material shows high catalytic activity when serving as a catalyst, has the characteristics of low cost and excellent catalytic property relative to the existing method for preparing the catalyst, and is suitable for large-scale marketization application.

In a method for producing a silicon single crystal by Czochralski method, the single crystal is grown with controlling a growth rate between a growth rate at a boundary where a defect region detected by Cu deposition remaining after disappearance of OSF ring disappears when gradually decreasing a growth rate of silicon single crystal during pulling and a growth rate at a boundary where a high oxygen precipitation Nv region having a density of BMDs of 1×107 numbers / cm3 or more and / or a wafer lifetime of 30 μsec or less after oxygen precipitation treatment disappears when gradually decreasing the growth rate further. Thereby, there is provided a silicon single crystal which does not belong to any of V region rich in vacancy, OSF region and I region rich in interstitial silicon, and has excellent electrical characteristics and gettering capability, so that yield of devices can be surely improved, and also an epitaxial wafer.

The invention provides a preparation method of a nitrogen-doped carbon material supported by cobalt nitride, and belongs to the field of preparation of nanocomposites. The method is to coat the outside of ZnO nanospheres with dopamine by using the ZnO nanospheres as templates to prepare a ZnO core-shell structure precursor, introduce cobalt into the ZnO core-shell structure in a form of cobalt nitrate, grind the ZnO core-shell structure in the presence of melamine, and calcine an obtained solid product at high temperature so as to obtain the nitrogen-doped carbon material supported by Co4N. The invention also provides the nitrogen-doped carbon material supported by Co4N prepared by the method. The material of the invention has excellent electrocatalytic properties and can be widely appliedto oxygen reduction, oxygen precipitation and the like.

The invention discloses a horizontal three-electrode electrochemical rechargeable zinc-air battery, belonging to the technical field of an electrochemical power supply. The battery comprises an oxygen precipitation electrode, a zinc electrode and a battery module and also comprises an oxygen reduction electrode, wherein the oxygen precipitation electrode, the zinc electrode and the oxygen reduction electrode are all horizontally arranged and assembled together by using the battery module, the zinc electrode and the oxygen precipitation electrode form a working loop during charging, and the zinc electrode and the oxygen reduction electrode form a working loop during discharging. The structure disclosed by the invention is favorable for battery sealing, the gravity effect during the charging and discharging process is eliminated, and zinc dendrite generation and zinc electrode deformation are prevented; by using a three-electrode system, the corrosion of oxygen generated during charging of a two-electrode system to an air electrode and the damage to a physical structure are avoided, and the cycle life of the battery is prolonged; and the horizontally-arranged electrodes are immersed in an electrolyte, thus, an oxygen diffusion channel built on the oxygen precipitation electrode is prevented, the electrode structure is greatly simplified, and the electrode fabrication and amplification is promoted.

An annealed wafer in which oxygen precipitation is uniform in the substrate plane and a manufacturing method thereof are provided. A nitrogen-doped silicon single crystal substrate pulled at the cooling rate of 4° C. / minute or more during crystal growth between 1100 and 1000° C. wherein the nitrogen concentration is 1×1014 to 5×1015 atoms / cm3 and V / G satisfies predetermined conditions serves as a substrate, and the substrate is subjected to heat treatment in a non-oxidative atmosphere.

The invention provides a preparation method for a lithium-cobalt-nickel-manganese-vanadium oxygen electrode material, which comprises the following steps of: a-, dissolving soluble salts of lithium, nickel, manganese, cobalt and vanadium into metallic solution formed by water and an organic solvent, evenly mixing the metallic solution with mixed alkali liquor prepared from ammonia water, ammonium carbonate, hydrogen peroxide and polyethylene glycol in proportion; and then, atomizing and heating to form lithium-nickel-cobalt-manganese-vanadium oxygen precipitations; b-, baking and briquetting the lithium-nickel-cobalt-manganese-vanadium oxygen precipitations; calcining under an air atmosphere to obtain a sintered product; cooling, grinding and screening the sintered product; and then calcining under an oxygen atmosphere to form the lithium-cobalt-nickel-manganese-vanadium oxygen material. The preparation provided by the invention is simpler n step, is lower in cost and is milder in high-temperature calcining condition.

In a method for producing a silicon single crystal by Czochralski method, the single crystal is grown with controlling a growth rate between a growth rate at a boundary where a defect region detected by Cu deposition remaining after disappearance of OSF ring disappears when gradually decreasing a growth rate of silicon single crystal during pulling and a growth rate at a boundary where a high oxygen precipitation Nv region having a density of BMDs of 1×107 numbers / cm3 or more and / or a wafer lifetime of 30 μsec or less after oxygen precipitation treatment disappears when gradually decreasing the growth rate further. Thereby, there is provided a silicon single crystal which does not belong to any of V region rich in vacancy, OSF region and I region rich in interstitial silicon, and has excellent electrical characteristics and gettering capability, so that yield of devices can be surely improved, and also an epitaxial wafer.

The invention discloses a lead-carbon battery positive electrode lead plaster added with electroconductive glass fiber, composed of the following constituents in percentage by weight of lead powder: 0.1-0.4% of stannous sulfate, 0.05-0.3% of antimonous oxide, 0.1-1.0% of electroconductive glass fiber, 0-0.2% of graphite, 8.0-10.0% of sulfuric acid with density of 1.40g / mL, and 10.0-15.0% of deionized water. According to the invention, the electroconductive glass fiber partly or completely replaces graphite material, and is directly mixed with the lead powder, thus, electrical conductivity of positive electrode active substance is improved, oxygen precipitation of the positive electrode can be reduced, utilization rate of the positive electrode active substance is improved, battery service life is prolonged, the lead-carbon battery positive electrode lead plaster is matched with a lead-carbon negative electrode, and integral performance of the lead-carbon battery is improved. The electroconductive glass fiber also can play a role in improvement of binding force strength of the lead plaster, and has no adverse effect on the positive electrode active substance; after the volume of addition is increased, electron conduction distance of the battery in a discharging process is shorter, reaction depth is higher, thus, battery capacity, charging receptivity and rate discharge performance are improved markedly.

A silicon wafer having a controlled oxygen precipitation property so as to result in a clean zone extending inwardly from the front surface and oxygen deposits in the body of the wafer sufficient for intrinsic purpose of suction. Specifically, prior to the formation of oxygen precipitates, the wafer body includes dopant-stabilized oxygen precipitate nucleation centers. The dopant is selected from nitrogen and carbon and is present in a concentration sufficient to render the oxygen precipitate nucleation centers resistant to heat treatment such as an epitaxial deposition process while maintaining the ability to dissolve any growing nucleation centers.

The invention relates to a nitrogen-doped carbon-coated nickel composite nano-carbon electrolysis water catalyst as well as a preparation method thereof. The nitrogen-doped carbon-coated nickel composite nano-carbon electrolysis water catalyst is prepared by the following steps: preparing a single-wall carbon nanotube composite material comprising carbon coated nickel by virtue of a DC arc discharging method, then removing amorphous carbon by virtue of oxidation and acid dissolving, further nitriding at a high temperature in an ammonia atmosphere, and obtaining a nitrogen-doped porous netted single-wall carbon nanotube composite material comprising the carbon coated nickel. The preparation method is low in raw material cost, simple and easy in operation and easy in mass production. The single-wall carbon nanotube composite material obtained in the DC arc discharging method has a porous netted structure, so that the precipitation of oxygen and hydrogen is facilitated, after the amorphous carbon is removed and the electron state on the surface of the carbon is optimized in a nitriding manner, the electrolysis water oxygen precipitation catalytic performance has better catalytic activity than the iridic oxide which is widely used in the industry, and the nitrogen-doped carbon-coated nickel composite nano-carbon electrolysis water catalyst has good catalytic hydrogen production activity when being used as an electrolytic water anode catalyst.

The invention provides a high-voltage additive and a high-voltage electrolyte for a lithium battery. The high-voltage additive is a compound containing cyclic enamine and a thiophosphonate structure;the structural formula I is shown in the specification, wherein R1 and R2 are respectively one of an alkyl group with 1-8 carbon atoms, a halogenated alkyl group, an alkenyl group with 2-8 carbon atoms, a halogenated alkenyl group, an alkynyl group with 2-8 carbon atoms, a halogenated alkynyl group, an aryl group with 6-8 carbon atoms or a halogenated aryl group. According to the high-voltage additive, a stable and compact CEI film can be formed on a positive electrode, transition metal ions on the surface of a positive electrode material are stabilized, oxygen precipitation of the positive electrode material is inhibited, and oxygenolysis of an electrolyte is reduced; and a film can be formed on the negative electrode, so that the stability of a negative electrode SEI film is improved, and the performance of the lithium battery under a high-voltage condition is improved.

The invention discloses a composite material for a cathode catalyst layer of a metal-air battery and a preparation method and application thereof. The metal is separated out from the surface of perovskite oxide in situ, doped carbon nanotubes are formed by catalytic in-situ growth of the metal, and the doped elements of the doped carbon nanotubes are at least one of B, N, S and P. The composite material for the cathode catalyst layer of the metal-air battery has the advantages of high specific surface area, high conductivity, rich active sites, multiple active interfaces and low cost, can catalyze an oxygen reduction reaction and an oxygen precipitation reaction at the same time, improves the double-effect activity of perovskite oxide, and improves the conductivity and dispersity of perovskite oxide material. The composite material is applied to the metal-air battery, so that power density of the metal-air battery and the overall performance of the battery can be improved, meanwhile, the use of a noble metal catalyst material is avoided, and the production cost of the metal-air battery is reduced.

The invention relates to a carbon-supported iron-doped tricobalt tetraoxide nanocrystal composite catalyst and a preparation method thereof, belonging to the technical field of composite catalysts. The catalyst has higher oxygen precipitation reaction electrocatalytic activity and durability in the alkaline medium. Iron nitrate and ferrous sulfate are doped as iron salt precursors to obtain the controllable-shape composite catalyst. Compared with catalysts of noble metals, noble metal oxides and the like, the composite catalyst has the characteristics of low price, stable performance, simple preparation process and the like.

The invention relates to a spherical electrocatalytic material and a preparation method thereof, and belongs to the field of electrode materials. The spherical electrocatalytic material has the molecular formula of CuCo2S4. A structure of the material is a spherical structure having the diameter of 1-3 [mu]m and formed by aggregation of nanosheets, and gaps exist between the nanosheets. The structure not only has a large specific surface area and can speed up the electron transport rate, but also can provide abundant active sites and are attached with more discharge products; the prepared spherical electrocatalytic material is indicated to have excellent Li<+> storage performance, and can easily provide more active sites to promote implementation of ORR (oxygen reduction reaction) and OER(oxygen precipitation reaction) when being used as an electrocatalyst for a lithium-oxygen battery, and is also conducive to electron and oxygen transport.

The invention relates to a bifunctional catalyst for the oxygen evolution and oxygen reduction reaction and a preparation method thereof, and belongs to the technical field of new materials and the preparation thereof. The catalyst is a composite material composed of a nano-carbon material, a porphyrin organic skeleton material and a metal oxide or hydroxide. The preparation method of the catalystis that: the porphyrin organic skeleton material intermediate is prepared by the polymerization reaction of the nano-carbon material, a five-membered heterocycle and a polyaldehyde according to a certain proportion, and then the porphyrin organic skeleton material intermediate is mixed with an aqueous solution of a metal salt and an alkali according to a certain proportion to prepare the catalystby the in-situ precipitation method. The high-performance bifunctional catalyst for the oxygen precipitation and oxygen reduction reaction is provided, and the activity of the non-noble metal bifunctional catalyst is greatly improved. The synthesis method of the catalyst has the advantages of simple operation, low cost and easy amplification, the catalyst is expected to be used as a cathode catalytic material for metal-air batteries and fuel cells, and thus the research and application of clean and sustainable energy devices is promoted.

The present invention discloses a method of reducing the white pixels of a CMOS image sensor by C ion implantation. In allusion to the problem that the white pixels of the conventional CMOS image sensor are more, and by an ion implantation technology, the C ions of a certain concentration are implanted in a P+ type isolation region around a photodiode, and by a high temperature annealing process, the aggregation of the C ions to the oxygen in the P+ type isolation region and the adsorption of the oxygen precipitation formed by the oxygen aggregation to the metal ion pollution in the photodiode are promoted, thereby being able to reduce the white pixels of the CMOS image sensor effectively.

A process for producing a single crystal silicon wafer comprising a front surface, a back surface, a lateral surface joining the front and back surfaces, a central axis perpendicular to the front and back surfaces, and a segment which is axially symmetric about the central axis extending substantially from the front surface to the back surface in which crystal lattice vacancies are the predominant intrinsic point defect, the segment having a radial width of at least about 25% of the radius and containing agglomerated vacancy defects and a residual concentration of crystal lattice vacancies wherein (i) the agglomerated vacancy defects have a radius of less than about 70 nm and (ii) the residual concentration of crystal lattice vacancy intrinsic point defects is less than the threshold concentration at which uncontrolled oxygen precipitation occurs upon subjecting the wafer to an oxygen precipitation heat treatment.

The invention provides a preparation method of a transition metal and nitrogen doped multistage pore-passage three-dimensional graphene. Soluble full-aromatic polybenzimidazole (PBI) serving as carbon and nitrogen sources, transition metal salt and a PBI solution react to obtain a PBI and transition metal ion complex, nano calcium carbonate is added in the mixed liquid to serve as a template agent, even mixing and concentration are performed to coat and regularly arrange the complex on the surface of the template agent, the template agent is removed through pyrolysis, the transition metal and nitrogen doped three-dimensional graphene with a multistage pore-passage structure is obtained, and multistage thorough pore passages can strengthen mass transfer. The viscosity average molecular weight of the PBI is 2-40 thousand. The molar ratio of the PBI to the transition metal is 1:2 to 2:1. The template agent is calcium carbonate, and the particle size of the template agent is 30-100 nm. The mass ratio of the PBI to the template agent is 2:1 to 1:4. Pyrolysis temperature is 800-1100 DEG C. The product can be used for oxidation-reduction reaction catalysts, fuel cells, metal air batteries, oxidation-reduction reaction catalysts, electrolytic water oxygen precipitation catalyst, supercapacitors and other fields.

The invention relates to a preparation of 3D graphene co-doped with cobalt and nitrogen. The 3D graphene co-doped with cobalt and nitrogen is prepared by regularly arranging complexes formed by soluble all-aromatic PBI (polybenzimidazole) and cobalt salt on template nanoparticle surfaces through pyrolysis, template removal and other process routes. PBI is selected from all-aromatic polymers such as ABPBI, mPBI and the like, and the viscosity average molecular weight ranges from 20,00 to 40,000; the mass ratio of PBI to cobalt salt is 1:2-2:1; the template is nanoparticles such as nano magnesium oxide, iron oxide, ferric hydroxide and the like and has the particle size of 5-50 nm; the mass ratio of PBI to the template is 3:1-1:3; the pyrolysis temperature is 700-1,100 DEG C. The product can be applied to the fields of redox reaction catalysts, fuel cells, metal-air battery redox catalysts, water electrolysis oxygen precipitation catalysts, supercapacitors and the like.

The invention relates to an electrolyzed water catalyst of nonconventional local area structure and a preparation method thereof. In the preparation method, A-position element of perovskite is selectively dissolved by using a method of treatment through an ultrasonic-assisted ferric iron solution, perovskite crystal oxide with small specific surface area is converted into amorphous hydroxide of ananostructure, and the hydroxide has extraordinary local area electron structure and geometric structure, thereby having ultrahigh oxygen precipitation performance. In consideration of pH difference of AB-position elements of a perovskite material, ferric iron with proper acidity is selected as a regulator, material structure is changed, and new active sites are introduced, so that ultrahigh OER activity is caused; the catalyst can be applied in the field of fuel cells, metal-air cells and water electrolysis.