109 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 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.

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 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.

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.

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 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 discloses a method for preparing a nano Co3O4 / carbon nanotube integral air electrode catalysis material. The method comprises the following steps: oxidizing the surface of a carbon nanotube to achieve surface functionalization, and combining the carbon nanotube as a carrier with uniform and dense nano Co3O4 particles through chemical bonds by using a thermal treatment method, so as to form an integral air electrode catalysis material which is free of adhesive connection and stable in structure. The integral air electrode catalysis material which is prepared by using the method has high transmission velocities of molecules, ions and electrons of reactants, and has high bidirectional catalytic activity of oxygen reduction / oxygen precipitation, and excellent chemical stability and mechanical strength. The method disclosed by the inention is simple in preparation process, and the obtained integral air electrode catalysis material has great application prospects in applicationin metal-air batteries such as lithium air batteries, sodium air batteries, aluminum air batteries and zinc air batteries, fuel batteries, electrochemical reactors such as hydrogen peroxide synthesisand electrochemical oxygen production, and the like, and in commercial development.