1152 results about "Perovskite (structure)" patented technology

The invention relates to a cross-system lattice constant modeling method, device and medium based on Pareto frontier optimization and symbolic regression collaboration, and the method comprises the steps: collecting theoretical calculation and experimental data of a perovskite and spinel cubic phase system, and constructing an initial data set containing geometric and electronic structure parameters; preprocessing the data; performing global search by adopting a Pareto frontier optimization algorithm to improve prediction precision and feature consistency to obtain an optimal feature subset; generating a lattice constant analytical model with physical significance through genetic programming by using a symbolic regression algorithm; the model is finely adjusted through experimental data, and a cross-system prediction general formula suitable for experimental conditions is obtained. Compared with the prior art, the method has the advantages that the global optimal feature subset is efficiently searched in the multi-material system, the explicit quantitative relation between the lattice constant and the key material attribute is established, and an efficient and reliable calculation means is provided for lattice constant prediction and mechanism analysis of the complex material system.

The invention provides a perovskite solar cell, a preparation method thereof and a photovoltaic module. The perovskite solar cell comprises a first electrode, a hole transport layer, a perovskite layer, an electron transport layer and a second electrode which are stacked in sequence. The material of the hole transport layer comprises a biomolecular material which is fixed on a self-assembly monomolecular layer material through an intermolecular force, and the biomolecular material comprises one or more of guanine, adenine, thymine, uracil, cytosine, hydroxymethylcytosine, xanthine, hypoxanthine, 6-mercaptopurine and corrin. According to the perovskite cell provided by the invention, the biomolecular material with a plurality of nitrogen heterocyclic structures and amino groups is added to generate multipoint hydrogen-bond interaction and pi-pi accumulation with the tail end of the SAM, so that the orderliness of molecular arrangement is improved, and the dipole direction and strength of the whole interface are regulated and controlled; and a coordination bond or hydrogen bond network is formed by the coordination compound and uncoordinated cations or anions in perovskite, so that interface defects are effectively passivated, and the thermal stability and the humid and hot life of a device are enhanced.

The invention discloses a perovskite solar cell and a preparation method thereof, and belongs to the technical field of perovskite solar cells. SAM molecules are introduced between the hole transport layer and the perovskite active layer, the photoelectric conversion efficiency of the perovskite solar cell is improved, an interface modification layer comprising a sheet-shaped P-type semiconductor material is further introduced at the interface of the hole transport layer and the SAM layer, the interface of the hole transport layer / the SAM layer / the perovskite active layer is improved, and the photoelectric conversion efficiency of the perovskite solar cell is improved. The hole transport layer and the perovskite active layer are separated from each other, the energy level difference between the functional layers is reduced, the carrier extraction and transmission of an interface are enhanced, the sheet structure of the sheet P-type semiconductor material can cooperate with the compact SAM layer to block the direct contact between the hole transport layer and the perovskite active layer, and the hole transport efficiency is improved. And the reduction reaction of halide ions in an interinterface hole transport material and a perovskite material is effectively prevented.

The invention discloses a perovskite cell panel surface defect detection method based on improved YOLOv9, and belongs to the technical field of image processing and defect identification. The method comprises the following steps: optimizing a backbone network structure by introducing an ExtraDw module, enhancing feature expression ability and reducing parameter quantity; a neck network is improved by adopting GsConv and SlimNeck, so that the multi-scale feature fusion efficiency is improved; a MobileMQA module and a Bottleneck Transform structure are utilized to enhance the global perception capability and the calculation efficiency of the model; and a Slide Loss function is used to optimize the training process, and the problem of imbalance between difficult samples and positive and negative samples is adaptively processed. According to the method, the detection precision and the model generalization capability of the fine defects on the surface of the perovskite battery piece are remarkably improved while relatively low computing resource occupation is maintained, and the method is suitable for an industrial real-time quality detection scene.

The invention discloses a perovskite type composite metal oxide oxygen carrier catalyst as well as a preparation method and application thereof, and belongs to the field of biomass chemical chain gasification / reforming. The oxygen carrier catalyst is of a La, Fe and Ni co-doped SrTiO3 perovskite structure, and active components Fe and Ni are embedded into a main body SrTiO3 perovskite crystal phase structure in an oxide or simple substance form; the method comprises the following steps: preparing an aqueous solution of lanthanum nitrate, strontium nitrate, nickel nitrate, ferric nitrate and citric acid, adding a mixed solution of tetrabutyl titanate and ethylene glycol into the aqueous solution, heating in a water bath, and stirring to form gel; drying and calcining the gel to obtain intermediate powder; and the intermediate powder is oxidized and reduced to form a high-temperature crystal structure under different atmospheres, and the perovskite type composite metal oxide oxygen carrier catalyst is obtained. The oxygen carrier catalyst provided by the invention has high tar conversion rate and stable cycle activity in the biomass chemical chain gasification / reforming process.

The invention discloses a high-temperature lead-free piezoelectric ceramic material, a preparation method thereof and a piezoelectric ceramic device. The method comprises the following steps: S1, obtaining 0.7 BiFeO3-0. 3 BaTiO3 ceramic powder of a perovskite phase structure, namely Ba (Zr < 0.2 > Ti < 0.8 >) O3 ceramic powder; s2, (1-x) (BF-BT)-xBZT ceramic powder is prepared according to the structural general formula (1-x) (0.7 BiFeO3-0.3 BaTiO3)-x (Ba (Zr0. 2Ti0. 8) O3), and (1-x) (BF-BT)-xBZT ceramic powder is obtained; wherein x is more than or equal to 0.02 and less than or equal to 0.06; s3, (1-x) (BF-BT)-xBZT prefabricated powder is obtained; s4, performing granulation and compression molding on the prefabricated powder to obtain a ceramic green body; and S5, heating, glue discharging and solid-phase sintering are carried out on the ceramic green body, and the piezoelectric ceramic material is obtained. The piezoelectric ceramic material can replace the traditional lead-based piezoelectric ceramic to be applied in a high-temperature and low-electric field.

The invention provides a perovskite solar cell, a preparation method thereof and a photovoltaic module, and the perovskite solar cell comprises a substrate, a first carrier transmission layer, a perovskite absorption layer, a second carrier transmission layer and an electrode layer which are sequentially stacked. And a nano-silver particle layer is arranged between the first carrier transport layer and the perovskite absorption layer. According to the invention, the nano-silver particle layer is used as a crystal nucleus, so that the crystallization of the perovskite absorption layer is promoted, and the high-quality perovskite thin film with large grain size and low defect density is formed; in addition, the particle surface of the nano-silver particle layer can reflect sunlight, a light trapping structure is formed, and the utilization rate of light can be remarkably improved. In conclusion, the photoelectric property of the perovskite solar cell can be effectively improved, and the perovskite solar cell has a wide application prospect.

The invention discloses a perovskite thin film, a photoelectric device and a method for improving the surface quality of the perovskite thin film. The method for improving the surface quality of the perovskite thin film comprises the following steps: S1, preparing the perovskite thin film; s2, performing picosecond pulse laser surface polishing treatment; and S3, guanidine ion implantation and repair: applying a guanidine salt solution to the surface of the perovskite thin film, removing the redundant guanidine salt solution on the surface of the perovskite thin film after the guanidine ions are implanted into the surface of the perovskite thin film, and then carrying out annealing treatment. According to the method, the surface of the perovskite thin film is polished through the picosecond pulse laser, the roughness of the surface of the perovskite is effectively reduced, a surface layer rich in defects is removed, guanidine ions are selectively implanted again through a multi-A-site vacancy structure formed on the surface of the perovskite thin film subjected to laser polishing, multiple hydrogen bonds are formed through the guanidine ions and a perovskite framework, and the surface roughness of the perovskite thin film is effectively reduced. And deep and stable defect passivation and lattice strengthening are realized, and the high-quality perovskite thin film with smooth surface, low defect density and high stability is obtained.

The invention belongs to the technical field of perovskite solar cells, and particularly relates to a preparation method for improving the quality of a perovskite thin film by using a local high-temperature field, and the method comprises the steps: 1, forming a perovskite precursor thin film on an electron transmission layer; step 2, when the precursor film is in an intermediate phase or an incompletely crystallized state, placing the precursor film below a heating plate with a microstructure array, keeping a gap between a convex part of the microstructure array and the surface of the precursor film, and forming a periodically distributed local high-temperature field on the surface of the precursor film; step 3, maintaining the local high-temperature field to act for a period of time, so that the local area of the precursor film is preferentially crystallized; and 4, removing the heating plate, and uniformly annealing the precursor film. According to the method, a local high-temperature field is applied to induce a hot spot region to preferentially nucleate, abnormal growth and Ostwald ripening of crystal grains are inhibited, and the large-area uniform perovskite thin film with narrow crystal grain size distribution, low defect density and a flat film surface is obtained, so that the efficiency and consistency of a device are improved.

The invention relates to the technical field of photovoltaic solar cells, and discloses a perovskite thin film, a preparation method and application, the perovskite thin film is prepared from a perovskite precursor solution by adopting a one-step spin-coating method or a two-step deposition method, and the perovskite precursor solution comprises 2, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5- The perovskite material is prepared from 2, 4-oxazolidinedione, a raw material for synthesizing the perovskite material with the ABX3 crystal structure, and a solvent. According to the invention, 2, 4-oxazolidinedione (OD) molecules are simply introduced into a perovskite precursor solution, especially into an inorganic precursor solution (such as a lead iodide precursor solution), and the porous PbI2 can be obtained by utilizing the interaction between electron-donating groups in the OD molecules and lead iodide, so that when the organic ammonium salt is spin-coated in the second step, the porous PbI2 can be obtained. The organic ammonium salt solution can rapidly diffuse and fully react, so that the perovskite thin film with larger and more uniform crystal grains is obtained, and the residual amount of harmful PbI2 is remarkably reduced.

The invention discloses a method for preparing a perovskite solar cell based on a nanoimprint technology, which belongs to the technical field of solar cell devices, and comprises the following steps: preparing a PDMS (Polydimethylsiloxane) soft film with a nano conical column structure on the surface, and then carrying out thermal nanoimprint on a perovskite thin film. The nano cone-column structure can induce regular and uniform growth of perovskite grains, so that the perovskite grains are regular in size and orderly arranged, and the grain boundary density and holes are reduced; and meanwhile, the nano conical column structure on the surface of the perovskite thin film can scatter incident light to increase the effective optical path length in the device, so that the light absorption of the device is enhanced, and the efficiency and the stability of the finally obtained perovskite solar cell are remarkably improved.

The invention discloses a trans-perovskite solar cell and a preparation method thereof. The trans-perovskite solar cell comprises a conductive substrate, a hole transport layer, a passivation layer, a perovskite absorption layer, an electron transport layer and a back electrode layer which are arranged in sequence, the hole transport layer is made of nickel oxide; the passivation layer is made of cerium oxide, and the thickness of the passivation layer is 2-5nm; the light incidence direction of the solar cell is from one side of the conductive substrate to one side of the back electrode layer. Ce < 3 + > in cerium oxide is preferentially combined with dangling bonds on the surface of NiOx to form Ce-O-Ni bonds, so that interface defects are eliminated; the cerium oxide energy level is located between the perovskite and the hole transport layer, so that an energy level buffering effect is achieved, and the photoelectric conversion efficiency is improved; the Ce < 3 + > / Ce < 4 + > valence state conversion characteristic of cerium oxide can efficiently absorb and convert ultraviolet photons and prevent the ultraviolet photons from damaging a perovskite lattice structure; the fluorite structure of CeO gamma forms an ion diffusion barrier to block Ni < 2 + > from migrating to a perovskite layer and protect the perovskite structure.

The invention discloses a doped perovskite catalyst with a noble metal exposed on the surface, a preparation method and application thereof, belongs to the technical field of catalytic materials, and particularly relates to application in catalytic removal of volatile organic compounds. The method comprises the following steps: performing composite molding on rare earth elements / alkaline earth metals, transition metals and noble metals by adopting a sol-gel method, and performing strong acid surface etching and other operations. The surface of the catalyst is provided with a noble metal nanocluster or noble metal nanoparticle structure, so that the surface area is increased, more active sites can be provided, the adsorption of reactant molecules is enhanced, and the conversion rate and selectivity of a catalytic reaction are further improved. Based on the structure and performance advantages, the catalyst disclosed by the invention can be used for efficiently removing volatile organic compounds, can effectively reduce the initial temperature of the catalytic oxidation reaction of the volatile organic compounds, and has a wide application prospect in treating various industrial processes needing high-temperature and efficient catalysis.

The invention discloses a perovskite crystalline silicon laminated cell structure and a preparation method thereof, the structure comprises a crystalline silicon bottom cell, a nanometer tunneling layer and a perovskite top cell which are arranged in sequence from bottom to top, and the nanometer tunneling layer is of a non-full coverage structure. By implementing the structure, the performance of the crystalline silicon / perovskite laminated solar cell can be improved, a perovskite film forming technology suitable for a suede crystalline silicon substrate is developed, the design of the middle tunneling layer is optimized to reduce light loss and non-radiative recombination loss, and the photoelectric performance and stability of the laminated solar cell are remarkably improved.

The invention relates to the technical field of perovskite solar cell functional thin film packaging, in particular to a solar cell with a perovskite active layer packaged by a double-sided thin film and a preparation method of the solar cell. Al2O3 is used for depositing a layer of Al2O3 thin film between the perovskite active layer and a P-type carrier transport layer (hole transport layer HTL); a layer of SiO2 thin film is deposited between a perovskite active layer and an N-type carrier transport layer (electron transport layer ETL), and a double-sided thin film wrapping layer is formed by an Al2O3 thin film and the SiO2 thin film; through the design and preparation method of the Al2O3 / SiO2 double-sided thin film packaging perovskite active layer, the core stability problem of the perovskite active layer is effectively solved. The double-sided packaging structure can efficiently block water and oxygen permeation, and the perovskite is prevented from being decomposed due to water and oxygen erosion; meanwhile, diffusion of metal electrode ions to a perovskite layer and migration of halogen ions in perovskite to the electrode can be inhibited, bidirectional damage is reduced, and the sensitivity of perovskite to water and oxygen and performance degradation caused by interface ion migration are relieved fundamentally.

The invention provides a perovskite pseudo-single crystal thin film and a preparation method thereof. The preparation method comprises the following steps: (1) preparing a perovskite polycrystalline thin film on a hydrophilic substrate; (2) pressing a hydrophobic substrate on the perovskite polycrystalline thin film to obtain a sandwich structure; (3) performing hot-pressing annealing treatment on the sandwich structure; and (4) after hot-pressing annealing treatment, removing the hydrophilic substrate and the hydrophobic substrate to obtain the perovskite pseudo-single crystal film. On the basis of the hot pressing technology, full diffusion, dissolution and recrystallization of crystal grains are promoted, the perovskite quasi-single crystal thin film with large crystal grains, low defects and high orientation is formed, and the method is suitable for various perovskite materials, simple in process, good in repeatability and capable of meeting the actual requirements of novel photoelectric devices.

The invention relates to a quantum dot foaming diffusion plate and a preparation method, and belongs to the technical field of optical diffusion plates. The quantum dot foaming diffusion plate is formed by uniformly mixing a plastic base material, a composite nucleating system, a composite foaming system and an auxiliary agent and then performing extrusion molding, the composite nucleating system comprises calcium carbonate, modified nano silicon dioxide and talcum powder, and the modified nano silicon dioxide is prepared by modifying a silane coupling agent and the organic acid salt; the auxiliary agent further comprises perovskite quantum dots; the composite foaming system comprises an alkaline component and an auxiliary agent; the diameter of foam holes of the quantum dot foaming diffusion plate ranges from 150 micrometers to 500 micrometers. According to the scheme provided by the invention, through the synergistic effect of the composite nucleating system and the composite foaming system, the uniformly distributed foam structure with the foam diameter in the range of 150-500 microns can be obtained, and the narrow-band emission characteristic of the perovskite quantum dots can be cooperated with the light scattering effect of the foam structure, so that the dual functions of scattering and fluorescence conversion are realized; and the color gamut coverage rate of the diffusion plate is improved.

The utility model provides a perovskite photovoltaic assembly. The perovskite photovoltaic assembly comprises a substrate, a perovskite solar cell module, a packaging structure, a covering layer and a protective layer. The perovskite solar cell module is located on one side of the substrate; the packaging structure is located on one side, away from the substrate, of the perovskite solar cell module, and the packaging structure wraps the upper surface and the side face of the perovskite solar cell module; the covering layer is located on one side, deviating from the substrate, of the packaging structure; the orthographic projection of the covering layer on the substrate covers the orthographic projection of the packaging structure on the substrate. The covering layer is arranged in the perovskite photovoltaic module, so that defects such as holes, dirt spots and the like of the perovskite layer can be visually covered, and the attractive effect of the perovskite solar cell is improved. And meanwhile, water and oxygen in the environment can be blocked, so that the service life of the perovskite photovoltaic module is prolonged, and the reliability of the perovskite photovoltaic module in the storage and use processes is improved.

The invention relates to the technical field of environmental governance, and particularly discloses a bismuth ferrite-based photo-Fenton catalyst and application thereof. The bismuth ferrite-based photo-Fenton catalyst comprises a bismuth ferrite matrix or a catalyst, the bismuth ferrite matrix comprises Fe (NO) 9HO and Bi (NO) 5HO in a molar ratio of 1: 1-1: 1.1, the catalyst is one of metal-doped bismuth ferrite, non-metal-doped bismuth ferrite or a bismuth ferrite composite material, and the loading amount of metal in the metal-doped bismuth ferrite is 0.5-5 wt%. Fe (NO) 9HO and Bi (NO) 5HO are adopted as precursors, the stoichiometric ratio of a bismuth ferrite matrix can be regulated and controlled, generation of impurity phases is inhibited, and it is ensured that the matrix has a complete perovskite structure and a good photoresponse characteristic; meanwhile, modification means such as metal doping, non-metal doping or composite carrier loading are adopted.

The invention discloses a space high-temperature environment tolerant perovskite cell and a preparation method thereof, and relates to the technical field of solar cells, the perovskite cell comprises a substrate, a conductive layer, a hole transport layer, a first oxide layer, a perovskite light absorption layer, a second oxide layer, an electron transport layer, an interface layer and a metal electrode layer which are stacked in sequence, wherein the hole transport layer is made of nickel oxide; the crystal structures of the first oxide layer and the second oxide layer are perovskite crystal structures; the perovskite light absorption layer is made of inorganic metal halide with an ABX3 type structure; the interface layer is made of metal chromium; according to the invention, the problems of easy material decomposition and interface failure of the perovskite cell under a high-temperature condition are improved, and the high-temperature resistance of the perovskite cell is improved, so that the perovskite cell meets the requirement of long-term stable work in a space high-temperature environment.

The invention relates to the technical field of solar cell equipment, in particular to a macro high-yield perovskite thin film air exhaust crystallizer which comprises a horizontal vacuum narrow cavity structure, a substrate connection system, a vacuum air exhaust system, an active air inlet system and a crystallization control system. The horizontal type vacuum narrow cavity structure is of a slit type (the height is smaller than or equal to 100 mm), the top plate is provided with an airflow pumping structure with a strip-shaped air pumping / air inlet, a rectification unit and a uniform flow dispersion transition face (the equivalent curvature radius is larger than or equal to 5 mm), the substrate connection system comprises a flexible ejector pin supporting and vacuum adsorption positioning unit, the vacuum air pumping system can achieve 50-5000 L / s pumping speed and 0.1-1000 Pa vacuum degree adjustment, and the horizontal type vacuum narrow cavity structure can achieve uniform flow dispersion. According to the macro high-yield perovskite thin film air exhaust crystallizer, stable two-dimensional laminar flow can be formed, the uniformity of a film layer can be improved, defects can be reduced, a large-area thin film can keep high compactness and crystallinity, the photoelectric conversion efficiency and the production yield of an assembly can be improved, and commercialization requirements can be met.

The invention discloses a foldable integrated perovskite solar cell and a manufacturing method thereof, the foldable integrated perovskite solar cell is innovatively realized, specifically, a laser segmentation process is used to replace a hinge structure with a large physical size and a complex installation process, and the manufacturing cost is reduced. The light and thin perovskite cell is endowed with foldable performance while segmentation and packaging of the perovskite cell unit are realized, the production process is simplified, the manufacturing cost is reduced, the perovskite cell unit is kept flat in the folding process, the problem that the performance of the cell is reduced due to the fact that a functional layer is damaged when the perovskite cell unit is directly bent is avoided, and the performance of the cell is improved. According to the perovskite solar cell, the excellent photoelectric characteristic of the perovskite material is fully exerted, the efficiency loss caused by the failure of the perovskite cell unit is effectively reduced, the overall efficiency of the perovskite solar cell is improved, and the service life of the cell is prolonged. The bending characteristic is provided by the crease structure, so that the perovskite solar cell has great space utilization efficiency.

The invention discloses a perovskite solar cell with an internal interface modification layer, a photovoltaic module and a preparation method thereof, and belongs to the technical field of solar cells. The perovskite solar cell sequentially comprises a substrate, a bottom electrode, a first carrier transport layer, a perovskite light absorption layer, a second carrier transport layer and a back electrode from a light receiving front side to a light receiving back side, and the second carrier transport layer is of a multi-layer composite structure and comprises a first sub-layer, an inner interface modification layer and a second sub-layer. The inner interface modification layer is located between the first sub-layer and the second sub-layer. According to the invention, polyvinyl butyral or a derivative thereof is introduced into the inner interface of the carrier transport layer with the double-layer composite structure to serve as a modification layer, so that the photoelectric conversion efficiency of the perovskite cell is improved, and the air stability of the perovskite cell on rigid and flexible substrates is improved.

The invention discloses a perovskite solar cell and a preparation method thereof, and relates to the technical field of solar cells. A perovskite solar cell conductive substrate; the hole transport layer is arranged on one side of the conductive substrate; the hole selection layer is arranged on one side, far away from the conductive substrate, of the hole transmission layer; the perovskite absorption layer is arranged on one side, far away from the conductive substrate, of the hole selection layer; wherein the hole transport layer comprises an inorganic hole transport layer and an interface modification layer, the interface modification layer is arranged between the inorganic hole transport layer and the hole selection layer, and the interface modification layer has a hydroxyl nano capillary structure, so that the solution wettability of the surface of the hole transport layer is improved; the binding force between the hydrophilic group in the material of the hole selection layer and the hole transmission layer is improved, and the interface recombination and voltage loss between the hole transmission layer and the hole selection layer can be reduced.

The invention discloses a high-entropy perovskite hydroxide, a preparation method thereof and application of the high-entropy perovskite hydroxide in electro-catalysis of nitrate to synthesize ammonia, and belongs to the technical field of high-entropy perovskite hydroxides. The high-entropy perovskite hydroxide is ASn (OH) 6, and A is one or more of Zn, Mn, Co, Ni and Cu. The high-entropy perovskite hydroxide electrocatalyst which is simple in synthesis method, stable in structure and easy in raw material obtaining is obtained, the electrocatalyst can be applied to electrocatalysis of nitrate to synthesize ammonia, the highest NH3 Faraday efficiency is 98.16%, and the yield is 5.12 mg h <-1 > mgcat <-1 >. And a foundation is laid for developing other high-entropy perovskite compounds as electrocatalysts for electrocatalytic synthesis of nitrate.

Disclosed are a compound, an organic hole transport layer material, and a perovskite solar cell, relating to the technical field of perovskite solar cells. The compound has a structure represented by formula I, uses a carboxyl group, a sulfonic acid group, and a phosphoric acid group as anchor groups, and is connected to a carbon position at an active reaction site in an N-containing fused ring (the number of rings is greater than or equal to 3) by means of a double bond, thereby maintaining the long-axis rigidity of a molecule, so that the compound can be more effectively conjugated, and a functional group is introduced on the short axis of the molecule, thereby improving the overall rigidity and functionality of the compound. The use of the compound as an organic hole transport material can improve the extraction and transport of holes. The introduction of the functional group on the short axis of the molecule further improves perovskite thin film crystallization and passivates interface defects. The design of the structure of the compound in the organic hole transport material achieves more excellent HOMO energy level and valence band energy level matching between the organic hole transport material and an active layer material, thereby further improving the device efficiency and stability of perovskite cells.

The invention provides an amide-based additive and an application thereof in preparation of a perovskite solar cell. The molecular structural formula of the acylamino additive is shown as a formula I; r in the formula I is selected from any one of-H,-CH2OH,-CH2Cl and-CH = CH2. According to the invention, the amide-based additive is used in the hole transport layer and the perovskite light absorption layer and can be neutralized with PEDOT / PSS of the hole transport layer in the narrow-band-gap perovskite solar cell, so that the reaction between the PEDOT / PSS and perovskite is slowed down, and the growth of perovskite grains is promoted. Meanwhile, when the film is used for a narrow-band-gap perovskite light absorption layer, an amide group can be oxidized into carboxylic acid, oxidation of Sn < 2 + > in a perovskite precursor is avoided, and the defects of the film are reduced; the Pb vacancy is filled and combined by an amide group when the Pb vacancy is applied to a wide-band-gap perovskite absorption layer, so that the defect of a passivated film is improved; therefore, the perovskite energy level is better matched, the film quality is improved, and the photoelectric conversion efficiency and the stability of the perovskite solar cell can be remarkably improved.

The application provides a method for regulating halogen perovskite microstructure at a frozen temperature by using a laser and an electric field, and relates to a device, which is a customized TEM in-situ sample rod equipped with a laser optical fiber and a liquid nitrogen Dewar bottle, and a Nd:YAG pulse laser system with a wavelength of 532 nm, adjustable pulse frequency and a pulse duration of 7 ns coupled into a transmission electron microscope through the optical fiber; first, at a frozen temperature, perovskite nanocrystals are etched by controlling the energy, frequency and action time of the pulse laser, then at the frozen temperature, the small crystal nucleus rotation of the perovskite nanocrystals is controlled by using a low-energy pulse laser and applying an electric field, and the perovskite nanocrystals are recrystallized along specific crystal faces, so that perovskite nanocrystals with specific exposed surfaces, reduced microstructure defects and increased radiation resistance are obtained, and the method has great value for large-scale industrial production.

This invention discloses a method for preparing a (111) preferred-oriented perovskite thin film based on substrate control, comprising: providing a substrate; forming a SnO2 electron transport layer on the substrate; forming a zinc oxalate (ZnOX) interlayer on the electron transport layer; and preparing the perovskite active layer on the ZnOX interlayer using a two-step sequential deposition method, wherein the perovskite active layer has a (111) preferred orientation; in this invention, the interaction between oxalate anions and PbI2 induces the formation of a porous PbI2 film, which, combined with Zn... 2+ The defect compensation and lattice regulation effects of the embedded perovskite lattice successfully induced the growth of a (111) preferred orientation perovskite thin film with large grains (up to 3 μm in size) and low defect density, and the (111) / (100) peak intensity ratio was improved by nearly 5 times. This invention achieves the simultaneous optimization of perovskite thin film structure and device performance with a simple and effective interface modification strategy, providing a new path that is both scientific and practical for the industrialization of high-performance long-life perovskite solar cells.

The invention discloses an ultrasonic microreactor, system and method for preparing perovskite quantum dots. The ultrasonic microreactor comprises at least two feeding inlet ends, a discharging outlet end, a microchannel structure and an array microstructure. The micro-channel structure comprises a main channel and a plurality of branch channels, the main channel comprises a flow dividing section and a flow converging section, the flow dividing section is communicated with the feeding inlet end, the flow converging section is communicated with the discharging outlet end, and the inlet ends of the branch channels are arranged at intervals in the internal flowing direction of the flow dividing section; the outlet ends of the branch channels are arranged at intervals in the internal flowing direction of the confluence section, and the array microstructure comprises a plurality of three-dimensional protruding units arranged on the inner walls of the main channel and the branch channels in a protruding mode. Under the action of an ultrasonic field, the local shearing, turbulence and cavitation intensity is remarkably enhanced, so that rapid mixing and mass transfer enhancement of reactants under the micro-scale are realized, and continuous-flow and highly-controllable preparation of perovskite quantum dots is realized.