28 results about "Oxygen doping" patented technology

The invention discloses a surface defect and oxygen doping co-modified pore-rich g-C3N4 nano material as well as preparation and application thereof. The preparation method comprises the following steps: mixing a white viscous melamine-cyanuric acid suspension with an oxalic acid solution to obtain a melamine-cyanuric acid-oxalic acid suspension solution, carrying out hydrothermal treatment to obtain a hydrogen bond connected self-assembled supramolecular aggregate, and finally carrying out thermal polycondensation on the self-assembled supramolecular aggregate and formaldehyde to obtain the surface defect and oxygen doping co-modified porous g-C3N4. The surface defect and oxygen doping co-modified g-C3N4 nano material with different morphologies and physicochemical properties is obtained. The preparation method is simple in process flow, efficient, low in cost and suitable for large-scale production, and the synthesis process meets the green chemical requirement; the obtained nano material has a higher specific surface area and more active sites, and has higher catalytic reaction and adsorption performance on organic pollutants, namely levofloxacin, ciprofloxacin and tetracycline hydrochloride, in a water body.

The present application relates to the field of fluorescent carbon nanomaterials, in particular to a method for preparing pure purple light oxygen-doped carbon quantum rings with a half-peak width of 18 nm and a quantum yield close to 100% and applications thereof. The present application uses 2,3-dihydroxynaphthalene as a carbon source precursor, and prepares narrow-band purple light carbon quantum rings with a quantum yield close to 100% through a solid-phase catalytic reaction. The carbon quantum rings prepared by the present application have a hexagonal ring structure with oxygen doping, and have a wide application prospect in the field of display devices.

The invention relates to the technical field of oxygen doping, in particular to a high-stability hydrogen doping pressure regulator and an implementation method thereof.The high-stability hydrogen doping pressure regulator comprises a main body, a left gas tank, a hydrogen tank and a mixing tank are arranged in the main body, a gas guide pipe is arranged between the hydrogen tank and the mixing tank in a communicating mode, and a pressure regulating pipe is arranged at the end, located in the mixing tank, of the gas guide pipe in a communicating mode; an opening and closing speed reduction mechanism is arranged in the pressure adjusting pipe and comprises a rotating cylinder rotationally connected to the end of the pressure adjusting pipe, a pull rod is slidably connected to the interior of the rotating cylinder in a penetrating mode, and a sealing plate is fixedly connected to the end, located in the rotating cylinder, of the pull rod. When high-pressure hydrogen conveyed by the pressure regulating pipe reaches a bearing threshold value of the mixing tank, the rotary drum can automatically cut off conveying of the hydrogen, pressure relief is performed through the gas guide box, and the phenomena that hydrogen doping is stopped instantly, the hydrogen loses a flowing channel, the pressure in the pressure regulating pipe is increased, and a water hammer occurs are prevented.

The invention relates to the field of materials engineering and relates to an AlN-based hard material layer on bodies of metal, hard metal, cermet or ceramics and to a method for the production thereof. The aim of the invention is to provide an AlN hard material layer which has improved hardness and wear resistance and can be produced in an inexpensive and time-efficient manner. According to the invention, an AlN-based hard material layer is provided, which is an individual layer or a multi-layered layer system, wherein at least the one layer or at least one layer of the multi-layered layer system is an AlN-based hard material layer with a hexagonal lattice structure that has a <002> texture and is oxygen-doped, wherein the oxygen doping is in the range of 0.01 at. % to 15 at. %. The hard material layer can be used as a wear-protection layer for cutting tools.

The invention relates to an oxygen-doped carbon nitride photo-anode and a preparation method and application thereof, and belongs to the technical field of photoelectrochemical cathode protection. The preparation method of the oxygen-doped carbon nitride photo-anode comprises the following steps: dissolving melamine and cyanuric acid in a solvent I to obtain a precursor solution, centrifuging the precursor solution, collecting precipitate, washing the precipitate, and drying to obtain a precursor; mixing the precursor with a solvent II to obtain slurry, coating a substrate with the slurry, and drying to obtain a precursor film; and calcining the precursor film and melamine in inert gas to obtain the composite material. According to the oxygen-doped carbon nitride photoanode and the preparation method thereof, the carbon nitride photoanode with different oxygen doping amounts is obtained by regulating and controlling the proportion of cyanuric acid to melamine, and the oxygen-doped carbon nitride photoanode is prepared by introducing part of an oxygen-containing structure into a carbon nitride skeleton through condensation and rearrangement of cyanuric acid and amino while the completeness of the carbon nitride triazine skeleton is kept.

This invention discloses a modified hard carbon material, its preparation method, and its application. The preparation method includes the following steps: S1, heating and holding biomass hard carbon in an aerobic environment to obtain oxygen-doped biomass hard carbon, wherein the heating temperature is 250~350℃, the heating rate is 2~5℃ / min, and the holding time is 2~5h; S2, introducing a protective atmosphere before the end of S1, heating and holding to obtain stabilized biomass hard carbon, wherein the heating temperature is 400℃~800℃, the heating rate is 2~10℃ / min, and the holding time is 0.5~2.5h; S3, heating and holding the biomass hard carbon treated in S2 under a protective atmosphere. This invention combines oxygen doping treatment and stabilization process of biomass hard carbon to obtain hard carbon material through carbon layer rearrangement at high temperature, which can improve carbon yield, eliminate impurities, and has the advantages of high initial charge capacity and high initial efficiency.

The application relates to the photovoltaic technology field, in particular to a back contact cell, a preparation method thereof, a back contact laminated cell and a photovoltaic module. The back contact cell comprises a substrate and a first passivation structure, and a first surface of the substrate is sequentially provided with a first hydrogenated amorphous silicon oxide layer, a second hydrogenated amorphous silicon oxide layer and a P-type doped layer. The oxygen doping ratio of the first hydrogenated amorphous silicon oxide layer is X1, the oxygen doping ratio of the second hydrogenated amorphous silicon oxide layer is X2, and X1 and X2 satisfy X1>X2. By arranging the laminated structure with the oxygen doping ratio gradient design, the asymmetric carrier transport channel can be formed, the blocking effect on the electrons and the transmission effect on the holes can be improved, the selective transmission of the carriers can be realized, the parasitic absorption at the interface can be reduced, the probability of the repeated absorption of the light by the substrate can be increased, the open-circuit voltage and the short-circuit current of the back contact cell can be improved, and the photoelectric conversion efficiency of the back contact cell can be improved.

The invention provides a preparation method and device of a composite negative electrode of a flow battery and electronic equipment. Based on the method, molybdenum powder and a carbon-based material are subjected to first chemical modification operation to form molybdenum nitride, nitrogen doping is formed on the surface of the carbon-based material, and a composite catalyst material is obtained; mixing the composite catalyst material with a matched adhesive and a solvent to obtain negative electrode slurry; coating the surface of a carbon-based negative electrode with the negative electrode slurry to obtain an initial negative electrode; and finally, performing second chemical modification operation on the initial negative electrode to form a molybdenum nitride layer modified by molybdenum oxide on the surface of the composite catalyst material coated on the surface of the initial negative electrode, and forming oxygen doping on the body of the initial negative electrode to obtain a target negative electrode meeting the requirement. Therefore, through multiple chemical modification operations, the target negative electrode with relatively high conductivity, relatively good hydrophilicity and relatively large specific surface area can be prepared at relatively low cost.

The application belongs to the technical field of semiconductors and relates to a low-resistance TiN film and a preparation method and application thereof, and the preparation method at least comprises the following steps: TiCl4 and NH3 are used as precursors, a TiN film is prepared through atomic layer deposition, and the obtained TiN film is treated with SiH4 during the deposition process; wherein the resistance of the TiN film is less than or equal to 305 ohms / square. In the deposition process of the TiN film, a strong reducing gas SiH4 is introduced to selectively reduce the adsorbed oxygen and weakly combined oxygen on the surface of the TiN, so as to reduce the oxygen doping concentration, significantly reduce the film resistance, and fundamentally inhibit the high-resistance problem caused by oxygen doping and lattice defects.

The invention relates to the technical field of high-temperature protective coatings, in particular to a preparation method of a high-temperature oxidation resistant coating for the surface of a turbine blade of an aero-engine, which is realized by cleaning an N5 alloy blade, depositing an oxygen-doped coating by multi-arc ion plating and performing vacuum annealing treatment. The thermal expansion coefficient difference between the coating and an oxidation film is reduced through oxygen doping, stress accumulation is reduced, meanwhile, an N5 alloy target homogenized with a matrix is adopted, element mutual diffusion is avoided, and the stability of a gamma / gamma'double-phase structure is maintained. The preferred process parameters comprise the flow ratio of Ar to O2, the deposition temperature and the annealing condition. The prepared coating is excellent in oxidation resistance at the temperature of 1000 DEG C, the weight increment is only 0.5 mg / cm, the peeling and cracking phenomena do not exist in circulating oxidation, the problem that a traditional coating is prone to failure is solved, and the method is suitable for large-scale industrial application.

The invention provides a hierarchical pore structure carbon material, a preparation method thereof and application of the hierarchical pore structure carbon material in oil gas recovery, and relates to the technical field of active adsorption. The carbon material disclosed by the invention is a nitrogen and oxygen doped hierarchical pore structure carbon material, the nitrogen doping amount of the carbon material is 1%-5%, and the oxygen doping amount of the carbon material is 0.5%-5%; the micropore rate is 50%-60%, and the average pore size is 0.5-20 nm. The benzene adsorption activity of the hierarchical pore structure carbon material is 295-332 mg / g, the benzene adsorption selectivity is 90%-93%, the adsorption retention rate is greater than or equal to 90%, the desorption temperature is low, the process can be simplified and the energy consumption can be reduced in oil gas adsorption and recovery, the regeneration efficiency is high, the applicability is strong, and the process efficiency of oil gas volatile gas recovery can be effectively improved.

Disclosed is a method for depositing an amorphous carbon film, the method including: (a) loading a substrate into a process chamber; (b) vacuumizing an inner space of the process chamber; and (c) converting hydrocarbon gas into plasma in the process chamber to deposit an amorphous carbon film on the substrate, wherein in the step (c), an oxygen-containing source is converted into plasma to dope oxygen into the deposited amorphous carbon film.

The invention discloses a nitrogen-oxygen co-doped zirconium-based halide solid electrolyte material and a preparation method thereof, the chemical formula of the nitrogen-oxygen co-doped zirconium-based halide solid electrolyte material is Li1 + 3x + 2yZrNxOyCl5, 0.15 < = x < = 0.3, 0 < = y < = 0.15, 1 + 3x + 2y + 1 = ax + by + 5, and a and b are respectively weighted average valences of N and O. The invention also discloses the preparation method of the solid electrolyte material. According to the nitrogen-oxygen co-doped zirconium-based halide solid electrolyte and the preparation method thereof, the nitrogen-oxygen co-doped zirconium-based halide solid electrolyte is obtained by performing mechanochemical synthesis according to a given stoichiometric ratio, the ionic conductivity and the positive electrode compatibility of the solid electrolyte are improved through nitrogen-oxygen doping, the defect that the oxidation stability of halide to a high-voltage positive electrode is relatively weak is overcome, and the stability of the solid electrolyte is improved. The halide solid electrolyte Li2ZrCl6 is subjected to nitrogen oxide anion co-doping to form the solid electrolyte with high room-temperature ionic conductivity, high oxidation potential and long cycle stability, and the solid electrolyte can be used for preparing a lithium ion all-solid-state battery.

The application discloses a high specific surface area high nitrogen and oxygen doped lignin porous carbon material and a preparation method and application thereof. The method comprises the following steps: firstly, preparing a supramolecular complex through a solvothermal reaction of lignin, magnesium hydroxide, cyanuric acid and melamine; then, directly carbonizing the supramolecular complex to obtain a nitrogen doped lignin carbon / magnesium oxide composite; and finally, activating the nitrogen doped lignin carbon / magnesium oxide composite by using a weak corrosive potassium salt to increase a micro-mesopore structure, so as to prepare the lignin porous carbon material with an ultrahigh specific surface area, rich micro-mesopore and nitrogen and oxygen doping. The high specific surface area high nitrogen and oxygen doped lignin porous carbon material has the advantages that the high specific surface area can provide a large number of active sites, the high nitrogen and oxygen doping can improve the wettability of the carbon material, the utilization rate of the active sites is improved, the problem of the mismatch between the pore size of the carbon material and the carriers is improved due to the rich micro-mesopore structure, and the specific capacitance of a zinc ion hybrid capacitor is significantly improved.

The application belongs to the technical field of lithium batteries, and particularly relates to a surface oxygen-rich sulfide solid electrolyte material and a preparation method and application thereof. The sulfide solid electrolyte material contains lithium ions and anions containing at least a sulfur element, and further contains oxygen elements. The oxygen elements are unevenly distributed, so that the oxygen elements are substantially enriched on the outer surface of the sulfide solid electrolyte material. Compared with the prior art, the surface oxygen-rich sulfide solid electrolyte material can greatly reduce the doping amount, improve the air stability and the stability to oxide positive electrodes by using oxygen doping, and does not affect the ion conductivity.

The invention relates to the technical field of solar cells, in particular to a solar cell, a preparation method thereof and a photovoltaic module. The solar cell of the present application comprises: a silicon substrate; the silicon substrate is provided with a first surface and a second surface which are oppositely arranged; the first intrinsic layer, the N-type doped layer and the first transparent conductive film layer are sequentially arranged on the first surface; the second intrinsic layer, the P-type doped layer and the second transparent conductive film layer are sequentially arranged on the second surface; the P-type doped layer comprises a first P-type doped layer, a second P-type doped layer and a third P-type doped layer which are arranged in sequence; the oxygen doping concentration of the third P-type doping layer is greater than the oxygen doping concentration of the second P-type doping layer and is less than or equal to the oxygen doping concentration of the first P-type doping layer; the boron doping concentration of the third P-type doping layer is larger than or equal to the boron doping concentration of the second P-type doping layer and larger than the boron doping concentration of the first P-type doping layer. According to the solar cell, carrier transportation can be enhanced, a hole contact barrier is reduced, and the conversion efficiency of the cell is remarkably improved.

The invention relates to the field of biosensing materials, and particularly discloses a composite material for detecting oxidative stress biomarkers in sweat, a preparation method of the composite material and application of the composite material in AD diagnosis. The composite material comprises a carbon nanotube substrate, molybdenum disulfide (MoS2-X) which grows on the surface of the carbon nanotube substrate and is subjected to oxidation treatment, and titanium dioxide nanoparticles compounded on the surface of the carbon nanotube substrate. The preparation method comprises the following steps: growing high-crystallinity MoS on CNTs through a hydrothermal reaction and high-temperature calcination, then carrying out oxidation treatment by using a hydrogen peroxide solution to introduce oxygen doping and surface defects, and finally compounding TiO nanoparticles through a secondary hydrothermal reaction. The composite material prepared by the invention has high conductivity, excellent biocompatibility and abundant catalytic active sites, can efficiently and specifically detect oxidative stress related biomarkers in sweat, and has high detection sensitivity and strong anti-interference capability. The composite material can be used for preparing a biosensor and is beneficial to early diagnosis of Alzheimer's disease.

The application provides a gap oxygen-doped Ti-Zr-Nb-Al medium-entropy alloy with a superhard oxide layer, and an expression is as follows: (Ti a Zr b Nb c Al d ) 100‑e O e , 40 at.%≤a≤50 at.%, 36 at.%≤b≤45 at.%, 3 at.%≤c≤17at.%, 1 at.%≤d≤7 at.%, 0.5 at.%≤e≤2.0 at.%, a+b+c+d=100 at.%. A preparation method comprises the following steps: mixing raw materials, smelting to prepare a cast ingot, polishing after wire cutting, and polishing to obtain the gap oxygen-doped Ti-Zr-Nb-Al medium-entropy alloy with the superhard oxide layer. Then, the gap oxygen-doped Ti-Zr-Nb-Al medium-entropy alloy with the superhardoxide layer is obtained by heat oxidation for 6h under the condition that the temperature is 500 DEG C and the air atmosphere is air, and natural cooling to room temperature. An application is also provided, and is used for medical orthopedic implant materials. The gap oxygen-doped Ti-Zr-Nb-Al medium-entropy alloy with the superhard oxide prepared by the application has a low elastic modulus, the surface of the alloy in an oxidized state has superhigh hardness, has good wear resistance, and can be used for medical orthopedic implant materials.

The application relates to the technical field of oxygen doping, in particular to a high-stability hydrogen-doping pressure regulator and an implementation method thereof. The high-stability hydrogen-doping pressure regulator comprises a main body, a left gas tank, a hydrogen tank and a mixing tank which are arranged in the main body, a gas guide pipe is arranged in communication between the hydrogen tank and the mixing tank, one end of the gas guide pipe in the mixing tank is arranged in communication with a pressure regulating pipe, an opening-closing speed-reducing mechanism is arranged in the pressure regulating pipe, the opening-closing speed-reducing mechanism comprises a rotating cylinder which is rotationally connected to the end of the pressure regulating pipe, a pull rod is slidably connected to pass through the rotating cylinder, one end of the pull rod in the rotating cylinder is fixedly connected with a closing plate, when the high-pressure hydrogen gas delivered by the pressure regulating pipe reaches the bearing threshold of the mixing tank, the rotating cylinder automatically cuts off the delivery of the hydrogen gas, and pressure relief is carried out through a gas guide box, so that the hydrogen doping is prevented from being instantaneously stopped, the hydrogen gas loses the flow channel, the pressure in the pressure regulating pipe is increased, and the water hammer phenomenon occurs.

An oxygen-nitrogen co-doped hollow carbon nanoparticle and a preparation method therefor and an application for electrosynthesis of hydrogen peroxide. Carbon nanoparticles are taken as a base material, firstly, in an oxygen-containing atmosphere, high-energy oxygen plasma generated by radio frequency (RF) excitation bombard the surface of the carbon nanoparticles, forcing carbon-carbon bonds in the carbon material to break and exerting a strong ablation effect on graphite layers of carbon, thereby forming a special hollow carbon structure. After an oxygen doping reaction is finished, the oxygen-containing atmosphere is switched to a nitrogen-containing atmosphere to prepare an oxygen-nitrogen co-doped hollow carbon nanoparticle catalyst.

The invention discloses a double-defect g-C3N4 photocatalyst with oxygen doping and nitrogen vacancy and a preparation method thereof, and belongs to the technical field of photocatalytic materials, the preparation method comprises the following steps: (1) pre-pressing original g-C3N4 powder into sheets to obtain a sample, and then loading the sample into a sample cavity of a high-pressure device; (2) putting the high-pressure device filled with the sample into a pressing machine, applying pressure to 5.0-6.0 GPa, then raising the temperature to 200-500 DEG C under the pressure of 5.0-6.0 GPa, and keeping the temperature and the pressure for 10-120 minutes at the temperature of 200-500 DEG C; (3) after heat preservation is finished, heating is stopped, the sample is cooled to the room temperature along with the furnace, pressure is relieved, and the sample is taken out; and (4) washing the taken sample with water, drying and grinding to obtain the double-defect g-C3N4 photocatalyst with oxygen doping and nitrogen vacancy. According to the preparation method disclosed by the invention, in a single high-temperature and high-pressure process, oxygen element doping of g-C3N4 and construction of nitrogen vacancy defects are synchronously realized, two defect sites can generate a synergistic effect, an electronic structure of the photocatalyst is more effectively regulated and controlled, and separation and migration of photon-generated carriers are promoted.

Interconnect structure of a multilayer interconnect feature of an integrated circuit device, wherein the interconnect structure comprises the following: a first interlayer dielectric layer, ILD layer (210); a second ILD layer (270) arranged above the first ILD layer (210); a first copper interconnect (230) located in the first ILD layer (210); a second copper interconnect (290) arranged in the second ILD layer (270); and an aluminum nitride contact etch stop layer, aluminum nitride-CESL (250), arranged between a section of the first copper interconnect (230) and the second ILD layer (270) and between the first ILD layer (210) and the second ILD layer (270), wherein the second copper interconnect (290) extends through the aluminum nitride-CESL (250) to physically contact the first copper interconnect (230), and wherein a surface nitrogen concentration at an interface between the aluminum nitride-CESL (250) and the first copper interconnect (230) is approximately 20 at% or higher, which further exhibits the following: an oxygen-doped silicon carbide CESL (260) arranged above the aluminum nitride CESL (250); and an aluminum oxide CESL (262) arranged above the oxygen-doped silicon carbide CESL (260), wherein the second copper interconnect (290) extends through the oxygen-doped silicon carbide CESL (260) and the aluminum oxide CESL (262).

The invention provides a deep ultraviolet LED epitaxial wafer and an epitaxial growth method thereof, and the deep ultraviolet LED epitaxial wafer is characterized in that a dislocation shielding layer (the oxygen content is higher than the background level) which is of an AlGaN-based composite structure and is intentionally doped with an oxygen element is arranged between an intrinsic layer and an electron injection layer; on one hand, the density of dislocation extending upwards is reduced through the scattering effect of oxygen doping on lattice defects, the crystal quality of the electron injection layer is improved, and the non-radiative recombination center is reduced; on the other hand, the pressure stress of an intrinsic layer with high Al components is relieved through the lattice expansion effect, the quantum confinement stark effect is inhibited, and the electron-hole wave function overlapping rate is increased. The dual-mechanism synergistic effect of the dislocation shielding layer significantly improves the luminous efficiency of the deep ultraviolet LED epitaxial wafer.

The application provides an oxygen order regulation method for ultrathin YBCO nanowires under a packaging boundary condition. The application realizes oxygen order regulation in the nanowires by ultraviolet light treatment on the ultrathin YBCO nanowires under a packaging condition, thereby improving the oxygen distribution uniformity of the ultrathin YBCO nanowires and improving the superconducting performance of the material. During the ultraviolet light treatment process, ultraviolet light irradiation can provide energy for oxygen atoms in the YBCO nanowires, so that the oxygen atoms obtain a certain migration ability in the crystal lattice, thereby inducing local rearrangement and gradually tending to a more ordered arrangement state. The ultrathin YBCO nanowire device processed by the method has more uniform oxygen doping distribution, effectively improves the superconducting performance of the material, provides a simple, controllable and good applicability oxygen order regulation method for the preparation of high-performance superconducting nanowire devices, and has important application value for the development of superconducting electronic devices and related quantum functional devices.

The invention discloses a preparation method and application of a wafer-level ultra-flat boron nitride / graphene heterogeneous film, and belongs to the technical field of two-dimensional material and integrated circuit packaging. According to the invention, through layer-by-layer dry transfer of the ultra-flat single crystal boron nitride film, complete packaging of two-dimensional materials such as graphene and the like is realized; in the boron nitride / two-dimensional material / boron nitride heterogeneous film structure, the ultra-flat single crystal boron nitride not only effectively protects a packaged material from being damaged in plasma, water and oxygen doping and deposition processes, but also can be used as an ideal seed layer for deposition of a high-k medium (such as hafnium oxide), so that the uniformity and interface quality of a medium film are ensured. The method has universality and expandability, and a key material basis is provided for packaging and integration of two-dimensional material electronic devices.

The invention discloses a combustion stabilizing device and method for oxygen-enriched combustion, and belongs to the technical field of power station boiler combustion. The device mainly comprises a hearth combustion assembly, an oxygen-doped stable combustion assembly and an oxygen supply regulation and control assembly. A plurality of groups of direct-current pulverized coal combustors of the hearth combustion assembly are arranged at the corners of the hearth of the tangential combustion boiler, so that an imaginary tangential circle can be formed; a plurality of oxygen-doped self-service stable-combustion combustors of the oxygen-doped stable-combustion assembly are arranged in a gap between a direct-current primary air nozzle and a direct-current secondary air nozzle and can form flames, and the flames and flames of the direct-current combustors form an actual flame area; the oxygen supply regulation and control assembly accurately supplies oxygen to the direct-current primary air pipeline and the inner secondary air pipeline through the two independent oxygen supply branches, and oxygen doping regulation and control under different loads are achieved in cooperation with the flow regulation and oxygen concentration monitoring component. According to the method, through a differential oxygen introduction strategy, on the premise of not depending on an external combustion-supporting technology, stable combustion of a coal power unit in a 15%-30% rated load interval is achieved, meanwhile, the reducing atmosphere and high-temperature corrosion risk of a hearth are reduced, and the deep peak regulation requirement is met.

The invention relates to the technical field of photovoltaic, in particular to a back contact cell, a preparation method thereof, a back contact laminated cell and a photovoltaic module. The back contact battery comprises a substrate and a first passivation structure, a first hydrogenated amorphous silicon oxide layer, a second hydrogenated amorphous silicon oxide layer and a P-type doping layer are arranged on the first surface of the substrate in a stacked mode, the oxygen doping ratio of the first hydrogenated amorphous silicon oxide layer is X1, the oxygen doping ratio of the second hydrogenated amorphous silicon oxide layer is X2, and X1 and X2 meet the condition that X1 is larger than X2. By arranging the laminated structure with the oxygen doping ratio gradient design, an asymmetric carrier transmission channel can be formed to improve the blocking effect on electrons and the transmission effect on holes, so that selective transmission of carriers is achieved, parasitic absorption at an interface can be reduced, the probability that light is repeatedly absorbed by a substrate is increased, and the light emitting efficiency is improved. Therefore, the open-circuit voltage and the short-circuit current of the back contact cell can be improved, and the photoelectric conversion efficiency of the back contact cell can be improved.

The present application relates to a kind of for antibacterial oxygen-doped carbon nitride and its preparation method and application.Preparation method includes: after mixing urea, melamine, oxygen source and solvent, it is made into supermolecular state solid, wherein the mass ratio of the urea, the melamine and the oxygen source is (2-5):(1-3):(0.5-4);The supermolecular state solid is calcined, and oxygen-doped carbon nitride is obtained, the morphology of the oxygen-doped carbon nitride is nanosheet, and oxygen doping rate is 5%-60%.The oxygen-doped carbon nitride obtained by the preparation method has excellent photocatalytic activity, and has excellent inhibitory effect on bacteria.