48results about How to "Increase photovoltage" patented technology

The invention discloses an efficient and stable silicon-based photocatalytic hydrogen evolution electrode, a preparation method and applications thereof, wherein the efficient and stable silicon-basedphotocatalytic hydrogen evolution electrode comprises a p-type silicon substrate, a cadmium sulfide heterojunction layer, a titanium oxide protection layer and a platinum co-catalyst. The preparationmethod mainly comprises four steps of silicon wafer substrate surface cleaning, cadmium sulfide layer deposition, titanium oxide layer deposition and platinum aid loading. According to the present invention, the preparation of silicon and cadmium sulfide heterojunction is effectively achieved, the photo-generated voltage is increased, the problem that the silicon-based photocathode is unstable inthe aqueous solution is solved, and the stability of the material is improved; and the preparation method has advantages of simple operation process, strong controllability, stable photoelectrocatalytic performance of the product, and good repeatability.

The invention belongs to the technical field of photoelectrochemical cell semiconductor electrodes, and discloses a pyramid silicon-based photocathode with a uniform pn homojunction layer and a preparation method thereof. The uniform pn homojunction layer is diffused on a pyramid morphology p-type silicon substrate, a titanium dioxide protective layer is deposited on an atomic layer on the pn homojunction layer, and platinum nanoparticles are photoelectrically deposited on the titanium dioxide protective layer to serve as a catalyst. The preparation method mainly comprises five steps of silicon wafer substrate pyramid morphology etching, surface cleaning, spin coating and high-temperature diffusion, titanium dioxide layer deposition and platinum catalyst loading. the uniform pn homojunction layer is effectively prepared on the pyramid-shaped silicon substrate, and the photo-generated voltage and the stability are improved; AND the preparation method has the advantages of safe and simple operation process, cheap and easily available raw materials, stable photoelectrocatalysis performance and good repeatability.

The invention relates to a photoelectrochemical cell 100 for light-driven production of hydrogen and oxygen, especially from water or another electrolyte based on aqueous solution, having a photoelectric layer structure 1 and an electrochemical layer structure 2 in a layer construction 40, where - the photoelectric layer structure 1 for absorption of light 3 uninfluenced by the electrolyte 10 forms a front side 41 of the layer structure 40, and - the electrochemical layer structure 2, for accommodation of the electrolyte 10, forms a reverse side 42 of the layer construction 40, and - a conductive and corrosion-inhibiting coupling layer 13 forms electrical contact between the photoelectric layer structure 1 and the electrochemical layer structure 2 in the layer construction 40, where - the electrochemical layer structure 2 has an electrode structure of a front electrode 21 and an electrode structure of a rear electrode 22, between which is arranged an ion exchange layer 61 such that an integrated layer construction 40 is formed with the ion exchange layer 61 in contact with the electrode structure of the front electrode 21 formed for conversion of the electrolyte 10 and/or with the electrode structure of the rear electrode 22.

The present invention discloses a TiO2 nano-tube doped with a cobalt element and a preparation method thereof and applications. The preparation method comprises the following steps: preparing a TiO2 nano-scale powder doped with the cobalt element via a TiCl4 hydrolysis method; and preparing the TiO2 nano-tube doped with a cobalt element by using a hydrothermal synthesis method combined with a liquid-phase deposition treatment. The TiO2 nano-tube doped with the cobalt element can maintain good tubular morphology under 400 DEG C heat treatment, the crystal structure is an anatase/ rutile mixed crystal structure, and the nano-tube has relatively high specific surface area. The recombination of photo-generated electron-hole pair is effectively inhibited via cobalt element doping combined withthe liquid-phase deposition process, so that the activity of photo-catalytic degradation of methyl orange is largely improved, and an assembled dye-sensitized solar cell taking the prepared TiO2 nano-tube doped with the cobalt element as an anode material shows excellent photoelectric conversion performance.

The invention discloses a carbon-based perovskite solar cell based on a multifunctional interface modification layer, which belongs to the field of photoelectric devices, and particularly relates to alkali metal hydroxide as an interface modification layer between an electron transport layer and a perovskite light absorption layer and used for a perovskite solar cell. The carbon-based perovskite solar cell based on the multifunctional interface modification layer structurally comprises a transparent conductive substrate, an electron transport layer, a perovskite layer and a carbon electrode. Alkali metal hydroxide is modified between the electron transport layer and the perovskite layer mainly by a coating method. The modification layer improves the film forming quality of the perovskite layer by reducing the interfacial tension and the work function of the electron transport layer so as to promote carrier transport between interfaces and weaken non-radiative recombination in the film.The photoelectric conversion efficiency and the open-circuit voltage of the all-inorganic carbon-based perovskite solar cell integrated by the method are remarkably improved, and the stability and the hysteresis effect are remarkably improved.

The invention discloses an efficient ternary organic solar cell prepared based on a step-by-step deposition method, and the solar cell comprises a substrate, an anode, an anode modification layer, anactive layer, a cathode modification layer and a cathode from bottom to top, wherein the active layer is a wide-band-gap polymer donor (PM6) film and a non-fullerene receptor compound (a mixture of BO-4Cl and BTP-S2) film which are sequentially deposited on the anode modification layer by adopting a spin-coating process. By utilizing poor compatibility between BTP-S2 and PM6 and large shearing force during film formation of a spin-coating process, the active layer can have an ideal PiN morphology structure, namely, a donor rich phase is formed at the interface of the anode modification layer,a receptor rich phase is formed at the interface of the cathode modification layer, and a bulk heterojunction thick film in which a donor and a receptor are uniformly mixed is formed in the middle. Therefore, according to the ternary organic solar cell obtained by the invention, efficient generation and efficient collection of photocurrent are realized at the same time, the PCE is not only higherthan that of a corresponding bulk heterojunction ternary cell, but also the highest efficiency (18.50%) of the organic solar cell so far is obtained.

The invention discloses a perovskite solution with a controllable and adjustable operation time window, a cell, a preparation method and application, and belongs to the field of perovskite solar cells. The perovskite solution comprises perovskite ABX3, an acetonitrile solvent and a coordination type solvent, A site is a methylamine ion, B site is a lead ion, X site is a halide ion, and the coordination type solvent is selected from dimethyl sulfoxide, N-methyl pyrrolidone and 4-tert-butylpyridine. The preparation method comprises the following steps: placing perovskite single crystals or iodine methylamine and lead iodide powder prepared by stoichiometric ratio in a methylamine atmosphere to obtain a yellow perovskite precursor solution, or dissolving the perovskite single crystals or iodine methylamine and lead iodide powder prepared by stoichiometric ratio in a methylamine ethanol solution to obtain a viscous yellow perovskite precursor solution, and then, uniformly mixing the coordination solvent and acetonitrile to obtain the perovskite ink. The invention also provides the perovskite cell, the preparation method and the application. The ink disclosed by the invention can realize adjustment of a processing time window and is extremely high in industrial applicability.

The invention discloses a fabrication method of a Sb2S3-based full-inorganic thin film solar cell. The fabrication method comprises the steps of firstly, fabricating a layer of compact TiO2 thin filmon an FTO by employing a sol-gel method; secondly, depositing a Sb2S3 thin film by thermal evaporation after annealing of the TiO2 thin film, and performing surface vulcanization and simultaneously performing annealing on the Sb2S3 thin film by employing thioacetamide; and finally, transferring a graphene thin film grown by a chemical vapor deposition method to the Sb2S3 thin film to form a TiO2/Sb2S3/Gr thin film structure. The device obtains an open-circuit light voltage being 560mV, a short-circuit light current being 6.8 mA/cm<2> and photoelectric conversion efficiency being 1.17% under simulation sunlight source irradiation of 100 mW/cm<2> in a room temperature. Graphene is used as a hole transmission layer and a transparent conductive electrode of the Sb2S3-based solar cell, thus, the Sb2S3-based solar cell is low in cost and is simple to fabricate; and compared with the Sb2S3-based solar cells mostly employing organic hole transmission holes, the Sb2S3-based full-inorganic thinfilm solar cell has more stable device performance.

The invention relates to an organic photoactive component, especially a solar cell or a photodetector, built up from a plurality of layers, wherein at least one of the layers comprises at least one di-indeno[1,2,3-cd:1′,2′,3′-lm]perylene compound of the general formula in Illustration 1, wherein each R¹-R¹⁶ is independently selected from hydrogen, halogen, unsubstituted or substituted, saturated or unsaturated C₁-C₂₀-alkyl, C₁-C₂₀-heteroalkyl, C₆-C₂₀-aryl, C₆-C₂₀-heteroaryl, saturated or unsaturated carbocycle or heterocycle, which may be the same or different, wherein two adjacent radicals R¹-R¹⁶ may also be part of a further saturated or unsaturated, carbocyclic or heterocyclic ring, wherein the ring may comprise C, N, O, S, Si and Se, and the use of the said component.

The invention provides a method for filling surface molecular layer defects of a wide bandgap semiconductor adopting a nano structure, and effectively solves the problems that the interface charge composition is fast and the charge collecting efficiency is reduced during short-circuit due to the use of a cobalt-based single electron mediator with characteristics of low charge transfer reorganization energy and the like. The method comprises the steps as follows: an electrode of the wide bandgap semiconductor adopting the nano structure is soaked in a dye solution for dyeing; then a dyed semiconductor film is soaked in a solution containing a filling agent for filling the dye molecular layer defects; and the solubility of the dye in the solution containing the filling agent is smaller than 10 micromoles per litre. The invention further provides an application of the semiconductor electrode obtained with the method for filling the molecular layer defects of the wide bandgap semiconductor in dye-sensitized solar cells. According to the method for filling the surface molecular layer defects of the wide bandgap semiconductor adopting the nano structure, an electron tunneling distance of an interface composite reaction can be effectively controlled, so that the interface charge composition of the dye-sensitized solar cells is slowed down, and photovoltage, photocurrent and power conversion efficiency of a device can be improved.

The invention discloses a preparation method of TiO2 nanoparticles with photonic crystal characteristics. The preparation method comprises the following steps: preparing a precursor solution by mixing TiCl4 solution, absolute ethyl alcohol and deionized water; and with butterfly wings as a bio-template, treating the template by a solution impregnation method and removing the template at a high temperature to obtain the TiO2 nanoparticles. The preparation method disclosed by the invention has the advantages of simple technology, easily available raw materials, good product structure and performance and the like; and the prepared TiO2 nanoparticles with photonic crystal characteristics have a good application prospect in the field of thin-film solar cell study.

The invention discloses an unbiased photoelectrochemical hydrogen production system based on an InGaN nanorod photoelectrode on graphene and application thereof. The system comprises a photo-anode, a photo-cathode, an electrolyte, a light source and an electrolytic tank, the photo-anode structure sequentially comprises a substrate, graphene on the substrate and an InGaN nano column growing on the graphene from bottom to top, and the photo-cathode structure sequentially comprises a substrate and an InGaN nano column growing on the substrate from top to bottom; graphene is used so that the selection range of the substrate is widened, the graphene can be used as a conductive electrode, and the cost is reduced; a Schottky barrier can be formed between the graphene and the nanorod so that photon-generated carriers can be separated, the carrier transport performance can be enhanced, and the photoelectric property of the nanorod can be greatly improved; meanwhile, due to the light transmission of the graphene, the InGaN nanorod integrated photoelectrode can be prepared, spectral absorption can be widened, the photovoltage needed by water decomposition can be improved, and unbiased photoelectric water decomposition hydrogen production is achieved.

The invention discloses a full-oxide lead-free ferroelectric photovoltaic device with a sandwich structure and a preparation method thereof. The photovoltaic device comprises a substrate, wherein thesubstrate is covered with a BFO layer, the BFO layer is covered with an ITO layer, and the BFO layer is a BiFeO3-delta film which grows in an epitaxial mode. The photovoltaic device is advantaged in that oxygen vacancy doping is ingeniously utilized to increase light absorption efficiency of a ferroelectric layer, and the built-in potential caused by the work function difference between the upperelectrode and the lower electrode is utilized to cooperate with the ferroelectric depolarization field, and thereby separation of photo-induced electron hole pairs is effectively promoted, and photoelectric conversion performance of the device is improved.

The invention discloses a silicon nanowire-based thin-film silicon crystalline silicon laminated solar photovoltaic cell, which comprises an NIP amorphous silicon laminated cell located on an upper layer and a PIN heterojunction silicon cell located on a lower layer, wherein the NIP amorphous silicon laminated cell and the PIN heterojunction silicon cell are connected in series through an amorphous silicon tunnel junction; and a silicon nanowire array is arranged on the upper surface of crystalline silicon of an absorption layer of the PIN heterojunction silicon cell. The silicon nanowire array is introduced into the laminated cell, so that the cell has a light trapping advantage of the nanowire array, and relatively high open-circuit voltage and short-circuit current of the laminated cell at the same time.