11results about How to "Improve light absorption efficiency" patented technology

The invention relates to the technical field of photocatalytic processes, in particular to a catalyst for preparing methanol through photocatalytic reduction of CO2 as well as a preparation method and application of the catalyst. The catalyst comprises a composite carrier and active sites dispersed on the surface or in pores of the composite carrier, the composite carrier is of a heterojunction composite structure formed by a hollow TiO2 sphere and MCN, the hollow TiO2 sphere comprises a shell layer and a spherical cavity structure located in the shell layer, the shell layer is formed by TiO2 nanoparticles, and the MCN has a mesoporous pore structure; a II-type or Z-type heterojunction interface is formed between the hollow TiO2 spheres and the MCN through physical contact and chemical action; the active sites comprise copper nano species, sulfur vacancy defects and amino groups; the copper nano species are copper nano particles or clusters, and the valence state of copper is 0 and / or + 1 valence amino is grafted on the surface of the composite carrier through an organic long chain. The catalyst provided by the invention can greatly improve the yield and selectivity of methanol prepared by photocatalytic reduction of carbon dioxide.

The invention belongs to the technical field of optical detectors. The invention provides a preparation method of a broadband optical detector for dynamic encryption communication. The preparation method comprises the following steps: S1, providing a SiO2 / Si substrate; s2, sequentially transferring a first transition metal sulfide and a second transition metal sulfide on the SiO2 / Si substrate in a directional transfer manner to form a transition metal sulfide layer; s3, spin-coating a PbSe QDs solution or a PbS QDs solution on the transition metal sulfide layer to form a quantum dot film with uniform quantum dots; s4, an EDT acetonitrile solution is dropwise added to the surface of the quantum dot thin film, standing reaction is conducted for preset time, and then spin coating is conducted to remove redundant ligands and reaction by-products; and S5, placing the mixed dimension quantum dot / transition metal sulfide heterostructure optical detector on a heating table for annealing treatment to complete the preparation of the mixed dimension quantum dot / transition metal sulfide heterostructure optical detector. Wherein the energy barrier at the quantum dot / transition metal sulfide heterostructure can be independently and cooperatively regulated and controlled through the drain-source voltage and the gate-source voltage, and the confidentiality of the photoelectric detector can be improved.

The invention relates to the technical field of photocatalysts, in particular to a nonmetal plasmon heterojunction material, a preparation method and application thereof and a method for preparing p-aminophenol through reduction of p-nitrophenol. The nonmetal plasmon heterojunction material provided by the invention comprises a C3N4 nanosheet and a WO3-x nanoplate (x is 0.1 to 0.3) positioned on the surface of the C3N4 nanosheet. The WO3-x local surface plasmon characteristic can effectively expand the spectral response range of the non-metal plasmon heterojunction material in a visible region to a near-infrared region, and the light absorption efficiency of the non-metal plasmon heterojunction material is remarkably enhanced. The nonmetal plasmon heterojunction material provided by the invention can realize efficient reduction of p-nitrophenol based on the synergistic effect of an interface heterojunction, a built-in electric field and oxygen vacancies, is high in selectivity, has excellent photocatalytic activity for reduction of p-nitrophenol, and is excellent in photocatalytic activity stability.

The invention relates to a graphene / Cu NPs / silicon heterojunction-based Schottky solar cell preparation method, which relates to the photovoltaic technical field, and comprises the following steps: 1) pre-treating a silicon wafer; 2) evaporating a copper nano film on the surface of the pretreated silicon wafer; 3) depositing a graphene film on the copper nano film; 4) carrying out annealing treatment on the heterojunction; 5) evaporating an electrode layer on the back surface of the silicon wafer; and 6) evaporating an electrode layer on the front surface of the silicon wafer. According to the preparation method of the Schottky solar cell based on the graphene / Cu NPs / silicon heterojunction, the photoelectric conversion efficiency of the Schottky solar cell is remarkably improved to 15% or above, meanwhile, the material cost is reduced to 1 / 100 of that of a traditional precious metal system, and 2-5 nano copper nanoparticles formed after annealing have triple functions in the cell at the same time, so that the photoelectric conversion efficiency of the Schottky solar cell is greatly improved. As a back electrode material, the material cooperates with a silver-aluminum electrode to provide a low-resistance conductive path, the contact resistance is lower than 0.1 ohm square centimeter, an efficient Schottky junction is formed with a silicon substrate interface to enhance light capture, and the light absorption efficiency is improved by 30%.

The application discloses a kind of tannin-based Mn-Fe diatomic metal polyphenol nano-carrier loaded hypocrellin B nano-assemblies and its preparation method and application.The nano-assemblies use tannin as ligand, by step coordination driven self-assembly strategy, first with Mn 2+ Forming pre-assembly template, then introducing Fe 3+ Constructing Mn-Fe diatomic metal polyphenol network with atomic level uniform dispersion, and loading traditional Chinese medicine source photosensitizer hypocrellin B to obtain nano-preparation.The preparation realizes Fe 2+ / Fe 3+ Self-circulation, and can sustainably catalyze H2O2 in tumor microenvironment to generate hydroxyl radical, realizes long-acting chemical kinetics treatment;Meanwhile, in-situ oxygen production relieves tumor hypoxia, improves photodynamic therapy effect, and consumes glutathione to amplify oxidative stress.The preparation process of the application is mild, and biocompatibility is good, and it breaks through the bottleneck of insufficient effect of traditional treatment in anoxic tumor.

The invention relates to the technical field of texturing additives for monocrystalline silicon wafers, and discloses a texturing additive for a pyramid textured monocrystalline silicon wafer and a preparation method of the texturing additive. Comprising the following raw materials in parts by mass: 1-1.5 parts of organic sulfonate, 1-2 parts of a polyamine high-molecular compound, 1-2 parts of a high-molecular polymer, 0.5-1 part of a surfactant, 0.2-0.5 part of a composite additive and 90-110 parts of deionized water. The composite additive contains a large number of carboxyl groups, hydroxyl groups and amino groups, the adsorption performance of the texturing additive on the surface of the monocrystalline silicon wafer can be enhanced, then a uniform pyramid structure is formed, the reflectivity is reduced, and the contained modified nano titanium dioxide can form a nano composite film on the surface of the monocrystalline silicon wafer, so that the texturing effect is improved. And the surface roughness and the scattering effect are further improved.

The invention discloses a preparation method of a blue light absorbing material layer of a blue light absorbing photoresist, and relates to the technical field of photoresists, and the preparation method comprises the following steps: preparing a mixed matrix, adding a polyether siloxane copolymer, tetrakis [beta-(3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid] pentaerythritol ester, a modified mica sheet and a blue light absorbent into a resin solution, stirring, and carrying out vacuum drying to obtain the blue light absorbing material layer of the blue light absorbing photoresist. Dispersing, adding 2, 4, 6-triamino-1, 3, 5-triazine, stirring, filtering and curing; the blue light absorbent is added, a beta-diketone group in the molecular structure of the blue light absorbent can specifically absorb blue light in the wave band of 400-500 nm, the light absorption efficiency is high, almost no absorption is generated on ultraviolet light and long-wave visible light, the blue light can be accurately blocked, meanwhile, the photoetching exposure process is not disturbed, the blue light absorbent and zinc ions of the modified mica sheet can also form coordinate bonds, and the blue light absorbent can be used for absorbing blue light in the wave band of 400-500 nm. The coating is stably attached to the surface of mica, light absorption performance reduction caused by self-molecule agglomeration is avoided, and it is ensured that the blue light absorption effect of the film is uniform and lasting.

This invention discloses a black radiation-cooling thin film and its preparation method. The thin film comprises, from bottom to top, a substrate Sub, a black reflective module, and a radiation module. The structure of the black reflective module, from bottom to top, is MD1AD2, where M is a metal layer, D1 is a first dielectric layer, A is a visible light absorption layer, and D2 is a second dielectric layer. The structure of the radiation module, from bottom to top, is (A'1A'2A'3). s L, where A'1, A'2, and A'3 are the first, second, and third absorption layers, respectively, which have absorption in the 8μm-13μm band and high transmission in the 0.3μm-2.5μm band; L is a low refractive index protective layer; and s is the number of stacked periods, s≥1. This invention achieves good cooling performance while maintaining a black color.

The invention relates to the photovoltaic field, and discloses a back contact solar cell and a back side coarsening method thereof. In the first direction, first type regions and second type regions which are alternately distributed at intervals are arranged on the back surface of the substrate; in the second direction, a dielectric layer and a first type polycrystalline silicon layer are sequentially arranged on the back surface of the substrate in the first type region from inside to outside, and a dielectric layer and a second type polycrystalline silicon layer are sequentially arranged on the back surface of the substrate in the second type region; the surfaces, deviating from the substrate, of the first type polycrystalline silicon layer and the second type polycrystalline silicon layer are rough surfaces; a first type region electrode and a second type region electrode. The surface roughness of the first type polycrystalline silicon layer and the second type polycrystalline silicon layer away from the substrate is large, the adhesive force of the first type region electrode and the second type region electrode can be improved, meanwhile, the local current density and the contact resistance are reduced, the light scattering capacity of the surface of the first type polycrystalline silicon layer and the second type polycrystalline silicon layer away from the substrate can be improved, and the service life of the device is prolonged. And the cell conversion efficiency is improved.

The invention relates to the technical field of photovoltaic energy devices, in particular to a curved surface solar photovoltaic cell panel which comprises a cell panel body, a substrate, a supporting frame, light sensing mechanisms and an adjusting mechanism, the substrate is located below the cell panel body, the supporting frame is installed below the substrate, the light sensing mechanisms are arranged on the two sides of the cell panel body respectively, and the adjusting mechanism is arranged on the substrate. The adjusting mechanism is located on the supporting frame, the overturning angle of the cell panel is changed according to different light incidence angles in different time periods, the cell panel is made to be perpendicular to the light irradiation direction, and then the light energy absorption efficiency of the cell panel is improved.

This application relates to a material for degrading organic pollutants in soil and its preparation method, characterized by the following steps: (1) weighing zinc salt, indium salt and sodium acetate; (2) adding the zinc salt, indium salt and sodium acetate weighed in step (1) to a mixed solvent of ethylene glycol / water, and stirring magnetically to form a uniform mixed solution; placing the uniformly mixed solution in a reaction vessel and reacting at 150-180°C in an oven for 10-15 hours; (3) centrifuging the solution obtained in step (2) after natural cooling to obtain the product, and washing it alternately with ethanol and deionized water; (4) placing the washed material in a tube furnace and calcining it at 300-400°C for 1-2 hours to obtain a zinc oxide-indium oxide composite material. The material has a stable structure, a simple preparation process, and a high degradation rate for organic pollutants in soil.