16results about How to "Avoid recombination" patented technology

The invention provides a manufacturing method of a back contact solar cell and the back contact solar cell, and belongs to the technical field of solar cells. The manufacturing method of the back contact solar cell comprises the steps that a semiconductor substrate is provided, the semiconductor substrate is provided with a first surface and a second surface which are opposite, the first surface is a textured surface or a plane, and the second surface is a plane; and a first carrier collection region, a second carrier collection region and an isolation region between the first carrier collection region and the second carrier collection region are arranged on the second surface of the semiconductor substrate.

The invention discloses a near-infrared light mediated heterogeneous composite photocatalyst as well as a preparation method and application thereof, the heterogeneous composite photocatalyst is an up-conversion luminescent material loaded semiconductor material, and can realize up-conversion luminescent catalysis under the irradiation of 980nm near-infrared light; the up-conversion luminescent material is rare earth ion doped fluoride nanoparticles, fluoride is one or two of yttrium fluoride and sodium yttrium tetrafluoride, the doped rare earth ions comprise rare earth luminescent center ions and light absorption ions, the luminescent center ions comprise one of Er < 3 + >, Tm < 3 + >, Tb < 3 + > and Pr < 3 + >, and the light absorption ions comprise Yb < 3 + >; the semiconductor material is of a heterojunction structure which is tightly formed by Co3O4 quantum dots and g-C3N4 nanosheets. The up-conversion nanoparticles are synthesized by adopting a simple hydrothermal method and are loaded on the g-CN nanosheets modified by the CoO quantum dots, and the obtained composite material can effectively convert near-infrared light into visible green light, so that generation of photocatalytic reaction species is increased, and the up-conversion nanoparticles are recycled and reused for multiple times without inactivation.

The invention belongs to the technical field of photocatalysts, and particularly discloses a CoMo6 / Fe3O4 (at) ZnO composite material and a preparation method and application thereof.The photocatalytic mechanism of the prepared CoMo6 / Fe3O4 (at) ZnO composite material is as follows: after the composite material CoMo6 / Fe3O4 (at) CeO2 is excited by light, photo-induced electrons on CoMo6 are transferred to the surface of Fe3O4 (at) ZnO, meanwhile, photo-induced holes absorb an electron donor H2O on the surface of POM polyanions to react to generate. OH, and the CoMo6 / Fe3O4 (at) ZnO composite material is obtained. The. OH free radical with strong oxidation capability oxidizes eosin B to generate oxidation products such as CO2 and the like. In the experiment, a small amount of electrons absorb an electron acceptor O2 and reduce the electron acceptor O2 to generate. O2 <->, and the two free radicals act at the same time to promote the photocatalytic reaction. When a magnetic field is added outside, the oxidation capacity and rate of. OH are also accelerated, so that the degradation rate of eosin B is improved; the highest degradation rate on an eosin B dye can reach 92.21%; after an external magnetic field is applied, the degradation rate is obviously accelerated, and the reaction is almost complete 40 minutes after illumination is started.

The present invention discloses a yeast peptide-hydroxytyrosol complex with high ROS capture ability and its preparation method and application. The yeast peptide-hydroxytyrosol complex contains hydroxytyrosol and yeast peptide, and the yeast peptide is a peptide with a molecular weight greater than or equal to 1kDa and less than 3kDa produced by hydrolysis of yeast protein; the preparation method of the yeast peptide-hydroxytyrosol complex with high ROS capture ability, the yeast peptide and hydroxytyrosol are dispersed in a low ionic strength PBS buffer respectively, and then the yeast peptide dispersion and the hydroxytyrosol dispersion are mixed; the application of the complex with high ROS capture ability in the manufacture of antioxidant drugs. The yeast peptide-hydroxytyrosol complex provided by the present invention has high ROS capture performance, has higher free radical and peroxide scavenging ability than using hydroxytyrosol or yeast peptide alone, and shows excellent application potential in the fields of food and medicine.

The present invention provides a method for synthesizing a nitrogen-doped tungsten trioxide complete photocatalyst for water splitting. Catalysts of different shapes are obtained within different ranges of the molar ratio of the tungsten precursor to hydroxylamine hydrochloride. The band structure of nitrogen-doped tungsten trioxide is regulated by adjusting the content of the N atom dopant, and the hierarchical structure morphology is controlled to increase the number of active sites and the diffusion and mass transfer capacity of water molecules. The synthesized four different types of nitrogen-doped tungsten trioxide complete photocatalysts for water splitting can effectively meet different requirements for the photocatalytic water splitting rate. Compared with the prior art, the method provided by the present invention significantly improves the solar energy to hydrogen (STH) conversion efficiency of the catalyst for complete photocatalytic water splitting, and the maximum conversion efficiency value can reach 3.8%, and reduces the cost of catalyst materials, which has practical significance for reducing the cost of green hydrogen production. The method provided by the present invention is suitable for large-scale preparation of complete photocatalytic water splitting catalysts.

The application discloses a kind of Pt nanoparticle load Fe-based MOF photocatalyst and its preparation method and application, belong to environmental energy technical field.The preparation method disclosed in the application uses 2-amino terephthalic acid, FeCl3·6H2O and aqueous solution of chloroplatinic acid hexahydrate as raw material, through hydrothermal reaction, Pt nanoparticle is dispersed in situ and loaded NH2-MIL-101 (Fe), reduces interface charge transfer resistance, inhibits the recombination of photo-generated carriers, to further improve the photocatalytic nitrogen fixation activity, using the synergistic effect of NH2-MIL-101 (Fe) composite photocatalyst containing Pt nanoparticle to achieve the purpose of improving the yield of photocatalytic conversion of nitrogen to ammonia, significantly solve the high energy consumption and environmental pollution problem of traditional industrial nitrogen fixation Haber-Bosch method.

The invention provides a solar cell and a photovoltaic module. The solar cell comprises a silicon substrate, a doped semiconductor layer, an anti-reflection layer and an electrode, the electrode comprises a seed layer and a transmission layer; the doped semiconductor layer is arranged on at least one surface of the silicon substrate; an anti-reflection layer is arranged in at least partial region of one side, deviating from the silicon substrate, of the doped semiconductor layer; the surface of the doped semiconductor layer comprises a target region without an anti-reflection layer; the seed layer is arranged on the side, away from the silicon substrate, of the doped semiconductor layer and at least covers the target area, and the transmission layer is arranged on the side, away from the doped semiconductor layer, of the seed layer; the height of the position in the edge region of the seed layer is greater than the height of the position, deviating from the edge region, in the seed layer. According to the design, the blocking effect of the seed layer on the transmission layer can be improved, and the electrical performance of the solar cell is ensured.

The invention discloses an organic light-emitting compound and an organic electroluminescent device thereof, the compound is used as a bipolar main body material, and an electron donor unit D (Donat), an electron acceptor unit A (Aceppt) and a large steric hindrance construction unit are introduced, so that the transmission of current carriers can be effectively balanced, excitons can be uniformly distributed, and the light-emitting efficiency is improved. The recombination of carriers at an interface is avoided, and the quenching of triplet state-triplet state under high exciton concentration is reduced, so that the performance and the stability of the device are improved.

The invention relates to the technical field of photoelectricity, in particular to a laminated solar cell and a preparation method thereof, a power generation device and a power utilization device. The laminated solar cell comprises a top cell, a bottom cell and a middle connecting layer arranged between the top cell and the bottom cell, the middle connecting layer comprises a transparent conductive oxide layer and a doped conductive oxide layer which are stacked, the transparent conductive oxide layer is arranged close to the bottom cell, and the doped conductive oxide layer is arranged close to the top cell; the doped conductive oxide layer is doped with a rare earth element.

This invention belongs to the field of nanocomposite material preparation and application technology, and discloses a method for preparing and applying a dendritic ternary SrCO3-TiO2 / CdS composite material. First, SrCO3-TiO2 nanoparticles are synthesized using a simple hydrothermal one-pot method with tetrabutyl titanate and Sr(NO3)2 as raw materials. These nanoparticles are then dispersed in deionized water to form a suspension. Finally, a dendritic ternary SrCO3-TiO2 / CdS composite material is prepared using an in-situ hydrothermal growth method. The dendritic ternary SrCO3-TiO2 / CdS composite material prepared by this invention can be used to produce hydrogen peroxide under visible light and simultaneously degrade oxytetracycline. The dendritic ternary SrCO3-TiO2 / CdS composite material prepared by this invention forms a unique dendritic structure by combining SrCO3-TiO2 composite particles with CdS. By utilizing the synergistic effect among the three, the transport and separation of photogenerated electron pairs at the interface are accelerated, and their recombination is effectively inhibited, thereby improving the catalytic activity of the dendritic ternary SrCO3-TiO2 / CdS composite material. It has broad application prospects in the synthesis of green chemicals and water pollution treatment.

The present invention discloses a method for preparing a cadmium telluride detector with separated electron and hole transmission channels, comprising: providing a substrate, coating a photoresist mask layer on both sides of the substrate; providing a mask plate, the mask plate having an exposure window, using the exposure window to expose the to-be-doped region on both sides of the substrate; injecting doping ions into the to-be-doped regions on both sides of the substrate by an ion implantation device, so as to construct an N-type electron transmission channel in the substrate, forming a periodic PN structure. The present invention constructs an N-type electron transmission channel that penetrates both sides in a P-type cadmium telluride crystal by a double-sided ion implantation method, so that the transmission of electrons and the transmission of holes are separated in space, so as to effectively avoid the problem of carrier recombination, weaken the influence of carrier recombination and hole tailing effect on the attenuation constant, and improve the image quality of the detector.

The invention discloses a preparation method of a silicon carbide MOSFET device, and relates to the technical field of semiconductors. Comprising an N + Sub layer, an N-Drift layer, an N + region with the doping concentration of 1E17-5E18cm <-2 >, a CSL layer, a gate oxide layer, a Poly layer, an isolation dielectric layer and a front electrode metal layer which are sequentially arranged from bottom to top, a plurality of P + regions extending downwards are arranged on the top surface of the N + region; the doping concentration of the P + region is 3E17-1E19cm <-2 >; a heavily-doped N + region and a heavily-doped P + region are formed at the bottom of a P-body region in a planar gate SiC MOSFET, so that a hole of a parasitic PN junction body diode is cut off in the N + region in the middle of the P + region in the follow current process of the device and cannot move to a Drift layer, thereby preventing the hole from being compounded with electrons of the Drift layer, reducing the bipolar degradation effect, and improving the long-term stable use of the device.

The invention discloses a zeolite-based photocatalytic material with cadmium sulfide nanoflowers and nanoparticles coexisting on the surface and a preparation method and application thereof.The preparation method includes the steps that HMOR serves as a carrier, CdS nanoparticles grow on HMOR zeolite, growth and distribution of the CdS nanoparticles of two phase structures on the surfaces of the HMOR zeolite are achieved under the action of an HMOR electric field, the content of ammonia water in a system is controlled, and the photocatalytic material is prepared. Cadmium ions and a sulfur source react on the surface of HMOR, the zeolite-based photocatalytic material with cadmium sulfide nanoflowers and nanoparticles coexisting on the surface is prepared, phase heterojunctions between cubic-phase CdS and hexagonal-phase CdS can effectively promote separation of photo-induced electron-hole pairs, the CdS nanoparticles and HMOR can generate a synergistic effect, methylene blue is subjected to photocatalytic degradation, and the photocatalytic effect is good. The removal efficiency of methylene blue is improved. HMOR is used as an electron acceptor, can accelerate the transfer efficiency of photoelectrons, inhibit the recombination of charges and improve the photocatalytic efficiency, and has good environmental protection benefits and economic benefits.

The application relates to the technical field of semiconductor photoelectric devices, and particularly relates to a nanocrystal detection chip capable of perceiving multi-spectrum (covering 300 nm-15 mu m). By adopting a solution processing type nanocrystal thin film, rigid dependence on expensive single crystal infrared epitaxial wafers such as indium gallium arsenide (InGaAs) and indium antimony arsenide (InAsSb) of a traditional infrared detector is effectively broken, a patterned nanocrystal filter layer is prepared on an independent transparent optical substrate, a multi-band spectral modulation array is constructed through multiple photoetchings, and high-precision vertical heterojunction integration is realized with a bottom photoreceptive pixel. By utilizing the band tunable characteristics of nanocrystal materials, the physical band gap limitation of a traditional silicon-based sensor is broken, and full-spectrum photoelectric detection response from ultraviolet, visible light to medium-long wave infrared (300 nm-15 mu m) is realized. The application forms an in-situ physical barrier through a vertical heterojunction integration structure, and at the same time of completing micron-level spectral spectral modulation, reliable physical isolation and chemical protection are provided for the fragile nanocrystal active layer.

This invention discloses a heterogeneous nanostructure photocatalyst, its preparation method, and its application. The invention modifies the surface of the g-C3N4 photocatalyst by introducing carbon quantum dots (CDs) through doping technology. The CDs / g-C3N4 composite photocatalyst abandons conventional metal catalysis, and its preparation process is simple, low-cost, and reusable without deactivation, making it a promising new composite photocatalyst in the field of visible light catalytic oxidation technology. Applying this catalyst to the visible light selective catalytic oxidation synthesis of the key intermediate 3-(4-nitro-1-oxo-1,3-dihydro-2H-isoindol-2-yl)piperidine-2,6-dione demonstrates good yields.

The invention belongs to the technical field of functional materials, and particularly relates to a phosphoric acid functionalized nickel porphyrin covalent organic framework / carbon nanotube composite material, which comprises: a nickel porphyrin covalent organic framework, which is a polymer formed by connecting a plurality of nickel porphyrin monomers through a covalent organic framework ligand; the carbon nano tube and the nickel porphyrin covalent organic framework form a heterojunction through in-situ growth; and the phosphoric acid functional group is chemically bonded on the covalent organic framework ligand of the nickel porphyrin covalent organic framework in the form of an alpha-phosphoramidate bond. The composite material provided by the invention integrates the photocatalytic reduction of nickel porphyrin, the photothermal conversion of carbon nanotubes and the selective adsorption function of phosphate groups on uranium, and the three components cooperate to form a virtuous cycle of rapid mass transfer, efficient capture, in-situ reduction and active site regeneration, so that the efficiency and rate of extracting uranium from seawater are greatly improved.