96 results about "Quantum dot solar cell" patented technology

A new solar cell structure called a heterojunction barrier solar cell is described. As with previously reported quantum-well and quantum-dot solar cell structures, a layer of narrow band-gap material, such as GaAs or indium-rich InGaP, is inserted into the depletion region of a wide band-gap PN junction. Rather than being thin, however, the layer of narrow band-gap material is about 400-430 nm wide and forms a single, ultrawide well in the depletion region. Thin (e.g., 20-50 nm), wide band-gap InGaP barrier layers in the depletion region reduce the diode dark current. Engineering the electric field and barrier profile of the absorber layer, barrier layer, and p-type layer of the PN junction maximizes photogenerated carrier escape. This new twist on nanostructured solar cell design allows the separate optimization of current and voltage to maximize conversion efficiency.

Efficient photovoltaic devices with quantum dots are provided. Quantum dots have numerous desirable properties that can be used in solar cells, including an easily selected bandgap and Fermi level. In particular, the size and composition of a quantum dot can determine its bandgap and Fermi level. By precise deposition of quantum dots in the active layer of a solar cell, bandgap gradients can be present for efficient sunlight absorption, exciton dissociation, and charge transport. Mismatching Fermi levels are also present between adjacent quantum dots, allowing for built-in electric fields to form and aid in charge transport and the prevention of exciton recombination.

The invention discloses a nanocrystalline composite center-based stacked solar cell and a preparation method thereof. Specifically, the preparation method comprises the following three steps: (1) preparation of a front sub-cell; (2) preparation of a composite center; and (3) preparation of a back sub-cell. With lead sulfide nanocrystal as a hole transport layer of the composite center, the stacked solar cell has the characteristic that a solvent method process is simple in operation and has the device stability that a traditional solvent method material is short of. A novel composite center and lead sulfide colloidal quantum dot solar cell system has the compatibility; the efficiency is much higher than that of a lead sulfide quantum dot lamination device reported at present; the temperature of the overall preparation process is controlled within 140 DEG C; the whole preparation process is carried out in air; the technology is simple; and an inert gas atmosphere is not needed. The preparation method disclosed by the invention breaks through existing technical bottlenecks, and provides a certain guidance function for further improvement of the photoelectric conversion efficiency of the device and promotion of commercialized development.

The invention relates to a photoelectrode material used in a solar cell and a preparation method thereof, especially relates to a photoelectrode material of a nanometer porous metal load semiconductor and a preparation method thereof, belonging to the photoelectrode chemistry technical field. The photoelectrode material of a nanometer porous metal load semiconductor comprises a nanometer porous metal with a thickness of 50 nanometer to 100 micrometer and a semiconductor layer with a thickness of 1 nanometer to 1 micrometer, wherein after deposition the semiconductor layer uniformly coats the three dimensionally continuous hole wall surface of the nanometer porous metal. Compared with the photoanode material of traditional quantum dot solar cell, nanometer porous metal of the photoelectrode material used in solar cell produced in the invention has a three dimensional porous structure which provides better electrical transmission approach for material.

The invention discloses a quantum dot material, a quantum dot photoresist and a preparation method of the quantum dot photoresist and belongs to the field of quantum dot material modification. The quantum dot material comprises (a) a quantum dot core, (b) a quantum dot shell wrapping the outside of the quantum dot core, and (c) a surface ligand covering the surface of the quantum dot shell, wherein a general formula of the surface ligand is HS-(-CH2-)n-R, wherein n is an integer of 0-11 and R is groups containing unsaturated bonds. According to the quantum dot material, by adopting a sulfhydryl short-chain compound with unsaturated bond groups as the surface ligand, through polymerization reaction of the groups containing the unsaturated bonds and free radicals and cations decomposed from a photoinitiator material or polymerization reaction among the groups containing the unsaturated bonds between surface ligands, direct contact of the free radicals and cations and the quantum dot shell is avoided, the crosslinking degree of a polymer on the surface of the quantum dot shell is improved and a stable protective layer is formed on the surface of the quantum dot shell, so that the activity of the quantum dot material is ensured and the stability and the optical efficiency of the quantum dot material are improved.

The present invention relates to a method for synthesizing anatase titanium dioxide nanorod. The method comprises firstly adding a certain amount of acetic acid in a container, then adding butanedioic acid, ultrasonic agitating, and then adding N,N-dimethyl acetamide, carrying out ultrasonic agitating and finally adding titanium tetrabutoxide, mixing well, adding into a hydrothermal reaction vessel, reacting while heating to obtain anatase titanium dioxide nanorod after the reaction is completed. The titanium dioxide nanorod is a one-dimensional nanorod having anatase crystalline morphology. The anatase titanium dioxide nanorod prepared by the invention has characteristics of controllable size, simple preparation process and low cost. The anatase titanium dioxide nanorod can be used as a working electrode material of dye-sensitized solar cells and quantum dot solar cells.

The invention relates to a mechanical laminated solar cell and a preparation method thereof. The mechanical laminated solar cell is a mechanical laminated solar cell composed of a top-layer transparent perovskite solar cell and a bottom-layer heterojunction quantum dot solar cell; the top-layer transparent perovskite solar cell comprises a transparent counter electrode, a hole transport layer, a perovskite light absorption layer, a titanium dioxide electron transport layer and FTO transparent conductive glass which are distributed from top to bottom sequentially; and the bottom-layer heterojunction quantum dot solar cell includes FTO transparent conductive glass, a TiO2 light anode, a p-n quantum dot heterojunction and a Ag counter electrode which are distributed from top to bottom sequentially. The invention also provides a preparation method of the mechanical laminated solar cell. According to the whole preparation process of the mechanical laminated solar cell, an all-solution method is adopted, and therefore, the preparation method has the advantages of simple preparation process, low energy consumption, low cost and the like, and can effectively improve the photoelectric conversion efficiency of the perovskite solar cell and make it have more potential for market application.

The invention relates to a novel silicon quantum dot solar cell which belongs to the field of solar cells and is characterized in that a silicon quantum dot layer is added on a pn junction of a traditional crystalline silicon cell. The structure of the solar cell is as follows: phosphorus oxychloride (or boron tribromide) is diffused on a napped p type (or n type) crystalline silicon substrate, then a silicon dioxide layer containing n type (or p type) silicon quantum dots is prepared, silver positive electrodes are finally respectively added on the front surface and the back surface, and an aluminum back surface field of a silver aluminum back electrode is embedded. The cell has simple structure, strong light absorption capacity and large photo-generated current, and the preparation steps are compatible with the preparation process of the existing crystalline silicon solar cell, thereby providing a good solution way for improving the conversion efficiency of the existing crystalline silicon cell.

The invention relates to a method for preparing an antase titanium dioxide nanowire array by virtue of a one-step process. The method comprises the steps of adding a certain amount of crystal face inducer to a container at first, secondly, adding acetic acid and ultrasonically stirring until dissolving, thirdly, adding N,N-dimethylacetamide and ultrasonically stirring until being even, finally, adding a certain amount of tetrabutyl titanate, evenly mixing and adding the obtained mixture to a hydrothermal reaction in which a conductive substrate subjected to spin-coating treatment previously, heating for reacting, taking out a sample after the reaction is finished, washing the surface of the sample, and drying to obtain the antase titanium dioxide nanowire array. The one-dimensional antase titanium dioxide nanowire array prepared by the method has the characteristics of controllable dimension, simple preparation process, low cost and the like. The one-dimensional antase titanium dioxide nanowire array can be used as a working electrode material for a dye-sensitized solar cell and a quantum dot solar cell.

The invention provides a solar battery electrolyte and an application thereof, belonging to the technical field of solar batteries. The electrolyte can be liquid, jellylike or quasi-flow colloid. The invention is characterized in that the electrolyte at least comprises S<2->/Sx<2-> redox couples, and organic cation solvent matched with S<2->/Sx<2-> or a mixture of solvent and gelatinizer, wherein x is an integer between 2 and 6. The invention also relates to an application of the electrolyte in dye-sensitized solar batteries and quantum point batteries. By utilizing the S<2->/Sx<2-> redox couple electrolyte into the dye-sensitized solar batteries and quantum point solar batteries, most of flow concentration materials can be directly used and can not be corroded by the electrolyte, thus the preparation process of batteries can be greatly simplified, the production cost can be lowered, and the performance of the prepared battery is approximate to that of the battery in the prior art.

The invention discloses a convection assembly deposition method-based lead sulfide colloid quantum-dot solar cell and a fabrication method thereof. The lead sulfide quantum-dot solar cell is fabricated by a convection assembly deposition method, attractive forces among quantum dots and between quantum-dot substrates are increased, so that the quantum-dot average distance is reduced, the permeationeffect between the quantum dots and an array structure substrate is improved, a closely-stacked quantum-dot thin film is formed, the resistance of the quantum dots on an air atmosphere can be obviously improved during the expression and fabrication process of a quantum-dot photovoltaic device, and a bulk heterojunction quantum-dot solar cell with a favorable permeation structure is obtained. Since a temperature of the convection assembly process is relatively low, the quantum-dot device can be compatible with a flexible substrate, the process is performed in air, and the process is simple. With the lead sulfide quantum-dot solar cell disclosed by the technical scheme, the morphology of the quantum-dot thin film is effectively improved, the photoelectric conversion efficiency of the quantum-dot photovoltaic device is further improved, the quantum-dot semiconductor device is fabricated and used on a large scale, and the lead sulfide quantum-dot solar cell has a positive effect on commercial promotion.

The invention discloses a quasi-solid electrolyte. The quasi-solid electrolyte is characterized by being prepared through gelatinizing a liquid electrolyte in a manner of introducing at least one amide organic micromolecular gelatinizer of a specific structure into the liquid electrolyte, wherein the amide organic micromolecular gelatinizer is prepared through the chemical reaction between acyl chloride and amine or an amine derivative or between the acyl chloride and an ammonium salt or ammonium salt derivative. The electrolyte can be applied to the fields of dye-sensitized solar cells, quantum-dot solar cells and the like, the problem that liquid-electrolyte cells are difficult in seal and easy in leakage is solved, and the long-term stability of the solar cells can be improved effectively.

The invention discloses a preparation method of a lead sulfide quantum dot photovoltaic cell. The method comprises the steps of firstly infiltrating a broadband gap oxide thin film of which the thickness is 2-20 microns into a mixed solution of lead acetate, sodium sulfite and a slow-release agent nitrilotriacetic acid trisodium salt and standing at 5-50 DEG C in a dark place for 10-120 minutes; secondly sequentially infiltrating the obtained thin film in two precursor solutions of a positive ion resource and a negative ion source, controlling the infiltration time at 0.5-5 minutes and repeating the steps for 1-8 times; and finally combining a prepared photoelectrode and polysulfide electrolyte and cuprous sulfide counter electrodes to assemble a quantum dot solar cell. PbS quantum dots which are uniform in size and uniform in distribution can be prepared on the broadband gap oxide thin film, so that the charge transport characteristic can be improved and the charge collection efficiency can be improved while broad spectrum adsorption is ensured; and an efficient and stable quantum dot solar cell device is prepared.

The invention discloses a multi-junction solar cell containing an InAs quantum dot structure, wherein the multi-junction solar cell can be applied to a concentrated photovoltaic power generation system. The multi-junction solar cell is characterized by taking semiconductor single chips such as Si, Ge, GaAs as substrates, growing a multi-function solar cell material containing an InAs/GaAs quantum dot structure by adopting an MOCVD (metal organic compound chemical vapor deposition) technology or an MBE (molecular beam epitaxy) technology, taking an InAs/GaAs quantum dot solar cell with a p-i-n structure as a bottom cell, taking a GAiNAs cell as an intermediate cell, and taking a GaInP cell as a top cell, thus the bandwidth match of a multi-junction cell is optimized, and the conversion efficiency of the solar cell is improved.

The invention belongs to the technical fields of solar cells and energy resources, and particularly relates to a method for preparing a Cd1-xMnxSe quantum dot solar cell. The method includes the steps that TiO2, ZnO, SnO2 or Zn2SnO4 porous photo-anodes 4-20 micrometers in film thickness are stood in a reaction solution having the molar concentration ranging from 0.03 to 0.50 and composed of Cd2+, Mn2+ and Se sources and controlled release formulations according to a specific proportion, a reaction is carried out for 1-5 hours at 5-40 DEG C under the light shading condition, and Cd1-xMnxSe quantum dots are formed at the original positions of the surfaces of oxide particles of the porous photo-anodes, wherein the x ranges form 0 to 0.8. Photo-anode thin film carrying the quantum dots, the polysulfide electrolytes having the molar concentration ranging from 0.1 to 3.0 and Cu2S counter electrodes are assembled to form the quantum dot solar cell. The efficient quantum dot solar cell is obtained and is simple in preparation process, low in cost, prone to achieving batch production, wide in application prospect and high in research value.

The invention discloses a full-spectrum absorption multilayer perovskite/quantum dot solar cell device and a manufacturing method thereof. On an electron transport layer, two perovskite/quantum dots with mutually matched energy levels are used as active layer raw materials and dissolved in a solvent, and the two materials are mutually superposed for multiple times to form a film by adopting a spin-coating method, a Czochralski method or a film scraping method so that a perovskite/quantum dot multilayer superposed light absorption layer with different light absorption bands is obtained. According to the method for preparing a perovskite active layer at a low temperature, the obtained solar cell device can achieve full-spectrum absorption of sunlight, and is high in efficiency, good in repeatability and good in stability; and the manufacturing method provided by the invention is simple and convenient in process, low in cost, good in film uniformity and capable of realizing large-scale production.

The invention discloses a method for preparing a quantum dot solar battery based on a light absorbing coating, and belongs to the field of solar batteries. The method comprises the steps that a semiconductor quantum dot is loaded on broadband gap material nanocrystalline particles to obtain a brand-band gap material/quantum dot complex; the brand-band gap material/quantum dot complex is used for preparing the light absorbing coating capable of absorbing sunlight; due to the screen printing technology, the light absorption coating is printed on a conductive glass substrate to obtain a photo-anode; the photo-anode, an electrolyte and a counter electrode are assembled into the quantum dot solar battery of the sandwiched structure. The method is easy and convenient to implement, economical andrapid; the prepared light absorption coating is low in cost, the preparation process needs not high temperature sintering, energy consumption is lowered, and the production cost is lowered; the method is applicable to preparing large-area devices, and the application prospect of the quantum dot solar battery is improved.

The invention discloses a quantum dot sensitized solar cell and a preparation method thereof. The quantum dot sensitized solar cell comprises a quantum dot layer which is formed on the surface of nano-crystal particles of a nano-crystal porous layer. A surface modification material precursor is deposited on the surface of the quantum dot layer by an atomic layer deposition method to form a surface modification layer. According to the application, a wide-band gap semiconductor material or insulating material is deposited on the surface of the quantum dot layer by an atomic layer deposition technology to form the surface modification layer. Compared with a traditional quantum dot solar cell which is not modified or adopts a ZnS passivation layer, compounding of photo-generated electrons and electrolyte can be inhibited more effectively and the conversion efficiency of the cell is enhanced due to atomic size deposition, tiny growth particles and a more compact surface modification layer film. The method is innovative only in that the surface modification layer is added on the basis of the existing quantum dot layer. Even if the surface modification layer is added, high-temperature treatment is not needed, and drying can be performed at room temperature. The preparation technology is simple.