3051 results about "Perovskite (structure)" patented technology

The invention relates to the field of solar cells, and discloses a buried interface modified trans-perovskite solar cell and a preparation method thereof. The trans-perovskite solar cell structurally comprises a substrate, a conductive layer, a hole transport layer, a perovskite light absorption layer, an electron transport layer and a metal counter electrode which are sequentially layered, the hole transport layer adopts a hole transport material [4-(3, 6-dimethyl-9H-carbazole-9-yl) butyl] phosphoric acid (Me-4PACz), and the hole transport layer adopts a hole transport material [4-(3, 6-dimethyl-9H-carbazole-9-yl) butyl] phosphoric acid (Me-4PACz). According to bottom-buried interface modification provided by the invention, a hole transport material Me-4PACz is modified by adopting a (2-phenethyl) phosphonic acid small molecule material, the modified Me-4PACz hole transport layer has high perovskite layer coverage rate, the preparation process is simple, the efficiency of the assembled solar cell is high, the stability is obviously improved, and the commercial application value is very good.

The present invention provides a method and device for controlling the heat-affected zone of a perovskite battery laser processing, the method comprising: performing multi-source data collection and calibration processing on the perovskite battery stack structure to obtain a calibration data set including temperature distribution, surface morphology and electrical characteristics; based on the calibration data set, comprehensively analyzing the area where ion thermosensitive reactions are generated to obtain the risk zoning result of the heat-affected zone; based on the risk distribution result of the heat-affected zone, differentially configuring the energy output and movement path of the laser etching to obtain a control instruction set for local etching; according to the control instruction set, executing the laser etching process to obtain an etching control scheme for managing the heat-affected zone. The method monitors and identifies heat-sensitive areas in real time based on the collection and analysis of multi-source data, controls the temperature distribution and local thermal stress during laser processing, reduces thermal damage by accurately adjusting the laser power and scanning path, and improves the long-term stability of the perovskite battery.

Provided is a laminate capable of electrolyzing an oxygen compound gas represented by CO2 with high conversion efficiency and suppressing deterioration in electrolytic performance. In this laminate having a structure in which an electrolyte layer is sandwiched between an anode catalyst layer and a cathode catalyst layer, a perovskite oxide and CuFe2O4 are contained in the cathode catalyst layer, and the content of CuFe2O4 in the cathode catalyst layer is at least 10 mass%.

The invention discloses a method for passivating a perovskite solar cell by using diphenylamine ammonium salt and a derivative thereof, and belongs to the technical field of perovskite solar cells. According to the method, diphenylamine ammonium salt and a derivative thereof are introduced as an interface modification layer of perovskite through a solution spin-coating process, so that in-situ passivation is realized. The diphenylamino ammonium salt and the derivative thereof can effectively reduce surface defects of perovskite, passivate uncoordinated lead ions, supplement iodine vacancies, significantly reduce non-radiative recombination of a perovskite layer and promote charge extraction by virtue of unique properties of the diphenylamino ammonium salt and the derivative thereof, so that the open-circuit voltage and fill factors of the perovskite solar cell are improved. Meanwhile, large-volume ammonium cations can be gathered on a crystal boundary, so that the defect of the crystal boundary is filled, and ion migration is inhibited. In addition, after passivation, moisture can be effectively prevented from invading the three-dimensional perovskite structure, and the humidity stability and the storage stability of a cell device are remarkably improved. The invention aims at improving the photoelectric conversion efficiency of the perovskite solar cell and realizing the long-term stability of the device performance.

The invention belongs to the technical field of perovskite solar cells, and provides synthesis and application of a novel self-assembled monomolecular hole transport material with conjugated extended tail ends. According to the self-assembled monomolecular hole transport material, a carbazole group is used as a terminal core, an aromatic ring is introduced to the terminal of carbazole to extend a conjugated structure, an alkyl chain is used as a connecting unit, phosphoric acid or acetic acid is used as an anchoring group, and the self-assembled monomolecular hole transport material with conjugated extended terminal is formed. And the stability, the hole transport property, the hole extraction capability and the interface passivation capability of the material are improved. Experiments show that the self-assembled monomolecular hole transport material has an HOMO energy level matched with a perovskite layer, and hole transport is facilitated. When the self-assembled monomolecular hole transport material disclosed by the invention is applied to a trans-perovskite solar cell with a band gap of 1.53 eV, the photoelectric conversion efficiency as high as 26.11% is obtained, and excellent device stability is shown.

The invention discloses a high-entropy perovskite oxide catalyst as well as a preparation method and application thereof, and belongs to the technical field of catalysts. The chemical general formula of the high-entropy perovskite oxide catalyst is La (MMN) O3, and M is a transition metal element with high electronegativity. M is a mixture of Ni, Cu, Co and Fe elements. The molar ratio of La to Ni to Cu to Co to Fe to Mn is (0.9 to 1): (0.15 to 0.25): (0.15 to 0.25): (0.15 to 0.25): (0.15 to 0.25): (0.15 to 0.25): (0.15 to 0.25). The La (MMN) O3 catalyst is of a rod-shaped structure formed by stacking particles. According to the high-entropy perovskite oxide catalyst as well as the preparation method and the application thereof, the B site of perovskite is doped by the high-electronegativity transition metal element, so that the Mn-O covalence is enhanced, and the catalytic performance is improved; the catalyst is prepared in an electrostatic spinning and calcining mode, a rod-shaped structure with accumulated nano-particles is obtained, the surface area of the catalyst is increased, and the catalytic effect is improved.

The invention discloses a perovskite solar cell based on 1, 2PDADI (1, 2-propane diamine hydriodic acid) interface modification and a preparation method thereof, and belongs to the technical field of perovskite solar photovoltaics. The device structure of the cell sequentially comprises ITO conductive glass, a SnO2 electron transport layer, a 1, 2PDADI modification layer, a perovskite light absorption layer, a hole transport layer and an Ag counter electrode from bottom to top, the preparation method specifically comprises the following steps: (1) cleaning and blow-drying the ITO conductive glass; (2) spin-coating SnO2 nano dispersion liquid, and carrying out annealing treatment; (3) spin coating of a 1, 2PDADI / IPA solution is carried out, and annealing treatment is carried out; (4) spin-coating a perovskite precursor solution, and performing annealing treatment; (5) spin coating of a Spiro-OMeTAD precursor solution is carried out, and oxidation treatment is carried out; and (6) carrying out vacuum evaporation on an Ag counter electrode to obtain the 1, 2PDADI interface modified perovskite solar cell. The preparation process is simple and convenient, the cost is low, the prepared perovskite solar cell is small in hysteresis effect and high in photoelectric conversion efficiency, and a feasible thought and method are provided for commercialization of the perovskite solar cell.

The invention provides a perovskite-crystalline silicon laminated cell, which comprises a heterogeneous crystalline silicon cell, a tunnel junction, a conductive layer, a first carrier transport layer, a perovskite light absorption layer, a second carrier transport layer and a transparent electrode layer which are sequentially laminated, wherein the first carrier transport layer comprises a dendritic structure facing and extending into the perovskite light absorption layer, and the length of the dendritic structure is smaller than the thickness of the perovskite light absorption layer. According to the perovskite-crystalline silicon laminated cell provided by the invention, through the arrangement of the dendritic structure with a relatively good capillary effect in the first carrier transport layer, a high-quality perovskite absorption layer can be formed, so that the energy conversion efficiency of the perovskite-crystalline silicon laminated solar cell is greatly improved.

The invention provides a near-infrared perovskite laser and a preparation method thereof. The near-infrared perovskite laser includes: a substrate; the perovskite gain dielectric layer is arranged on the substrate, a microcrystalline structure is formed on the perovskite gain dielectric layer, and the microcrystalline structure is a resonant cavity of the perovskite gain dielectric layer. The near-infrared perovskite laser provided by the invention can realize lasing under optical pumping at room temperature without adopting an additional resonant cavity, so that the device structure is greatly simplified, and the integration of the laser is improved; by regulating and controlling the components and the preparation process, the regulation of the lasing peak can be realized, the regulation precision is high, and the use requirements of multiple wavelengths can be met; a full-solution method can be adopted for preparation, the process is simple, and the cost is low.

The invention provides a perovskite thin film passivation modifier, a perovskite thin film and a preparation method thereof, and a perovskite solar cell. The passivation modifier comprises passivation molecules providing passivation groups; the passivation groups and uncoordinated lead ions or other defect sites in the perovskite thin film form coordinate bonds; the passivation group is amino. Amino groups in the passivation modifier have relatively strong coordination capability and can form coordination bonds with uncoordinated lead ions or other defect sites in the perovskite material, so that grain boundary and surface defects are passivated, and in addition, the three-dimensional structure of the passivation modifier is beneficial to preventing moisture and oxygen from invading the perovskite thin film; and the stability of the perovskite thin film is further improved.

The invention belongs to the technical field of solar cells, and particularly relates to a fluorinated biguanide salt synergistically passivated perovskite solar cell and a preparation method thereof. The method comprises the following steps: S1, coating the surface of a perovskite light absorption layer with a fluorinated biguanide hydrochloride solution to form a synergistic layer; coating the surface of the synergistic layer with a halogenated phenylethylamine solution to form a synergistic passivation layer; and S2, arranging an electron transport layer and a hole blocking layer on the surface of the passivation layer. According to the invention, the synergistic passivation layer is introduced in the preparation process of the perovskite solar cell. The introduction of the fluorinated biguanide salt passivation layer can modify the perovskite crystal and generate the low-dimensional perovskite at the crystal boundary, and the second passivation layer can interact with the low-dimensional perovskite structure, thereby further protecting the perovskite film, improving the interface of the perovskite light absorption layer and the electron transport layer, and improving the short-circuit current density, open-circuit voltage and cell efficiency of the cell.

The utility model belongs to the technical field of perovskite cells, and discloses a novel packaging structure of a perovskite solar cell. Comprising a substrate and a perovskite solar cell arranged above the substrate, the perovskite solar cell is coated with a first packaging layer, a second packaging layer is arranged above the first packaging layer, the second packaging layer comprises a plurality of groups of blocking layers, each blocking layer comprises a hydrophobic layer and a water oxygen absorption layer which are alternately arranged from bottom to top, and the hydrophobic layers and the water oxygen absorption layers are arranged on the substrate. A hydrophobic layer is arranged on the uppermost layer in the barrier layers; and the blocking layer is coated with a sealing layer. And external water vapor and oxygen are subjected to multiple absorption and multiple blocking, so that the probability that the water vapor enters the perovskite battery is reduced. The water vapor barrier property is improved, the water vapor is prevented from permeating the surface of the perovskite solar cell, the probability of degradation caused by water vapor entering a perovskite layer in the perovskite solar cell is reduced, and the service life of the perovskite solar cell is prolonged.

The invention provides a method for improving the efficiency of a perovskite solar cell, and relates to the technical field of solar cells, the cell structure sequentially comprises a bottom substrate, a transparent electrode, a hole transport layer, a perovskite light absorption layer, an interface modification layer, an electron transport layer, a buffer layer and a metal electrode from bottom to top; a new additive 4-(2-aminoethyl) benzenesulfonic acid hydrochloride is introduced into the perovskite light absorption layer, the additive is introduced into the perovskite light absorption layer by being dissolved in a perovskite precursor solution, and the dosage of the additive is 0.1-1.5 mg / mL. Based on the method, the defect density of shallow energy level and deep energy level of perovskite is reduced, a more intrinsic perovskite absorption layer is formed through induction, balance extraction of electrons and holes is promoted, and then the open-circuit voltage and efficiency of the solar cell are remarkably improved.

This present disclosure provides a perovskite-silicon-based laminated solar cell and a manufacturing method therefor. In one aspect, a method for manufacturing a solar cell includes: providing a substrate, where the substrate includes a silicon-based bottom solar cell, a charge combination layer, and a first carrier transport layer sequentially laminated. The first carrier transport layer has a textured structure. The method further includes forming, on the first carrier transport layer, a perovskite light absorption layer. Forming the perovskite light absorption layer includes forming a first perovskite layer based on a solution method performed with a perovskite solution, and forming the second perovskite layer based on a perovskite skeleton vacuum evaporation method.

The invention relates to a non-equimolar-ratio high-entropy thermoelectric ceramic and a preparation method thereof. The chemical formula of the non-equimolar-ratio high-entropy thermoelectric ceramic is (Ca1 / 3Sr1 / 3Ba1 / 3) 1-xLaxTiO3 (x = 0.1-0.4). Through presintering, spark plasma sintering and reduction annealing processes, a single-phase perovskite structure composed of phases of the A-site high-entropy perovskite thermoelectric ceramic is obtained, equiaxed crystal grains are arranged in the ceramic, and the morphology of the equiaxed crystal grains is matched with that of cubic perovskite structure crystal grains. Elements Ca, Sr, Ba, La, Ti and O in the ceramic are uniformly distributed in the ceramic, and no agglomeration phenomenon exists. The A-bit non-equimolar-ratio high-entropy perovskite thermoelectric ceramic (Ca1 / 3Sr1 / 3Ba1 / 3) 1-xLaxTiO3 obtained by the invention has low thermal conductivity, high conductivity and Seebeck coefficient, further shows a high thermoelectric ZT figure of merit, is simple to operate and short in time period, and provides an effective path for preparing high-temperature thermoelectric materials.

The invention discloses a full-perovskite laminated solar cell design method and system and a solar cell, and relates to the field of solar cells. The method comprises the following steps: establishing a physical simulation model based on actual parameters of a full-perovskite laminated cell to be optimized; constructing a fitness function according to the performance indexes; accessing a meta-heuristic optimization algorithm into the physical simulation model to calculate a fitness function and continuously iterating to obtain an optimal physical parameter under an optimal fitness condition; the optical interference effect of the cell is analyzed based on the optimal physical parameters, and the photoelectric conversion efficiency is improved by adjusting the thickness of a specific layer or introducing a substitute material. Open voltage loss is avoided through the full-plane structure design, specific position antireflection is achieved through the asymmetric multi-film system, and light current is improved. The intelligent algorithm and physical simulation optimization design are combined, the experiment cost is reduced, the traditional concept is broken through, and functional layer thickness optimization is achieved.

The invention discloses a perovskite solar cell, a preparation method thereof, a cell module and a laminated cell. The perovskite solar cell comprises a composite hole transport layer and a perovskite light absorption layer, the perovskite light absorption layer is located on one side of the composite hole transport layer, and the composite hole transport layer comprises polyvinyl acetate and an SAM material. Therefore, the polyvinyl acetate is of a cross-linked network structure and can play a role in stabilizing the SAM material and inhibiting the SAM material from diffusing to the perovskite light absorption layer, so that the stability of the self-assembled monomolecular layer is improved, and the stability of the perovskite solar cell is improved; in the perovskite solar cell, carbonyl oxygen in polyvinyl acetate can be coordinated with uncoordinated metal ions in the perovskite light absorption layer to realize passivation of a bottom interface of the perovskite light absorption layer, so that interface recombination is reduced, and the performance of the perovskite solar cell is improved.

The invention belongs to the technical field of crystal materials, and particularly relates to a controllable growth device and method for a large-size perovskite structure iodine copper cesium single crystal. The designed growth equipment mainly comprises a growth system, a temperature control system and an anti-solvent diffusion system. The method for growing the large-size iodine-copper-cesium single crystal by adopting the temperature-control and speed-control anti-solvent diffusion method comprises the following steps: in the growth process of the iodine-copper-cesium crystal, carrying gas generated by a gas generator carries an anti-solvent into a grower through an anti-solvent device, and controlling the content of the anti-solvent entering a solution by adjusting the flow speed of the carrying gas, and further controlling the supersaturation degree of the growth liquid and carrying out crystal growth. According to the method, the crystal growth can be accurately controlled in the crystal growth process, the problems of small crystal size and poor quality of a volatilization method are solved, the problems of large corrosion, long growth period and the like of an acid solution used in a traditional cooling method are solved, and the problem of crystal cracking caused by large temperature difference and large internal stress after the growth is completed is avoided.

In the present invention, visible light is appropriately refracted and transmitted. A ceramic material (10) contains, as a primary component, a compound having a perovskite structure represented by the chemical formula A(B1v,B21-v)Ow, wherein A is one or more elements selected from among Ba, Sr, Ca, K, Na, La, Gd and Yb, B1 is one or more elements selected from among Ti and Hf, and B2 is one or more elements selected from among Ta, Nb, Zr, Ge, Gd, Yb, Ga, Ca and Al. The perovskite structure does not contain Mg, Zn, Y or In. v is a positive number that is less than 1. w is a numerical value that enables the overall chemical formula to have a neutral charge.

The invention discloses a metal organic framework material, a preparation method thereof and a perovskite battery, and belongs to the technical field of perovskite batteries. The preparation method comprises the following steps: dissolving 1, 2, 4, 5-benzene tetracarboxylic acid in an organic solvent, adding ZrCl4 and a regulator acetic acid, carrying out a heating reaction to obtain a reactant, and carrying out centrifugation, washing and vacuumizing on the reactant to obtain the metal organic framework material. The metal organic framework material has high-density free carboxyl and a nano structure, the high-density free carboxyl can achieve the purpose of adsorbing lithium ions, and the nano structure can obtain better dispersity. When the metal organic framework material is applied to a hole transport layer of a perovskite battery, lithium ions can be well adsorbed, free carboxyl groups can also form chemical bonds with Pb ions of a perovskite active layer, surface defects and unsaturated bonds of the perovskite active layer are reduced, compounding of electrons and holes is prevented, and the performance of the perovskite battery is improved. Therefore, the electrochemical performance and the stability of the perovskite battery are improved.

The present invention belongs to the technical field of ceramic material preparation methods, and specifically relates to a lead-free piezoelectric ceramic, its preparation method, and application. The lead-free piezoelectric ceramic is a KNN-based lead-free piezoelectric ceramic or a BT-based lead-free piezoelectric ceramic having a perovskite structure; the KNN-based lead-free piezoelectric ceramic is prepared by doping gallium nitride with potassium sodium niobate (KNN) ceramic as the matrix, and the chemical formula is 0.955 (K 0.48 Na 0.52 )Nb 0.98 Sb 0.02 O3‒0.045Bi 0.5 Na 0.5 ZrO3‒0.75mol% GaN; The BT-based lead-free piezoelectric ceramic is prepared by doping gallium nitride with barium nitride (BT) as the matrix, and the chemical formula is (Ba 0.85 Ca 0.15 )(Ti 0.9 Zr 0.1 ) O‒1.75mol% GaN; the lead-free piezoelectric ceramic has a dense structure, is lead-free, and exhibits excellent electrochemical properties. The preparation method for the lead-free piezoelectric ceramic is simple, low-cost, pollution-free, and utilizes readily available raw materials. The lead-free piezoelectric ceramic can be used to prepare energy harvesters and has significant application value.

The invention discloses a method for improving the efficiency of a perovskite solar cell, and belongs to the technical field of solar cells. The insulating spacer film prepared between the electron transport layer and the perovskite layer of the perovskite solar cell by adopting the electron beam evaporation method has high uniformity, the cell interface structure can be optimized, defects are reduced, charge recombination loss is reduced, and the photoelectric conversion efficiency and stability are effectively improved. The insulating spacer layer not only can block external moisture and pollutants, reduce direct contact between the perovskite layer and the electron transport layer and prolong the service life of the cell, but also can inhibit internal ion migration and slow down performance degradation. By accurately regulating and controlling the thickness of the insulating spacer layer, charge transmission optimization and compound loss minimization are realized. An innovative technical path is provided for research and development of efficient and stable perovskite solar cells, and further development of the solar cell technology is expected to be promoted.

The invention discloses a barium strontium titanate-based high-entropy energy storage ceramic with a core-shell structure, the barium strontium titanate-based high-entropy energy storage ceramic comprises SiO2 serving as a shell part and high-entropy ceramic powder serving as a core part, and the high-entropy ceramic powder comprises barium strontium titanate serving as a main phase and sodium potassium bismuth titanate serving as a high-entropy doping phase. The invention also discloses a preparation method of the barium strontium titanate-based high-entropy energy storage ceramic with the core-shell structure, which comprises the following steps: mixing and dissolving a carbonate raw material of a main phase and carbonate or oxide of a high-entropy doping phase, and stirring to form gel; removing organic components in the gel; calcining to form a perovskite phase to obtain high-entropy ceramic powder; sequentially dispersing in an acidic activator, a weakly acidic buffer agent and a weakly alkaline surfactant, adding a silicon source precursor, and heating to form a coating phase SiO2; and after sintering, annealing to obtain a final product. According to the barium strontium titanate-based high-entropy energy storage ceramic with the core-shell structure, the polarization intensity and the breakdown field strength of the ceramic can be improved at the same time.

The invention provides a nanometer casting and doping double-strategy improved lanthanum manganese perovskite catalyst, a preparation method thereof and application of the nanometer casting and doping double-strategy improved lanthanum manganese perovskite catalyst in degradation of halogenated organic pollutants. The preparation method of the nanometer casting and doping double-strategy improved lanthanum manganese perovskite catalyst comprises the following steps: taking transition metal salt as a doping agent, and mixing transition metal salt, lanthanum salt, manganese salt and a complexing agent in a solvent to form a mixed solution; then adding nano silicon dioxide, stirring and heating to a gel state, and drying to obtain a solid precursor; calcining the solid precursor to obtain a calcined product which comprises nano silicon dioxide and transition metal doped lanthanum manganese perovskite; and adding the calcined product into an alkaline solution, and etching to remove the nano silicon dioxide to form a nano pore channel structure so as to prepare the nano casting and doping double-strategy improved lanthanum manganese perovskite catalyst. The nano casting and doping double strategies have a synergistic improvement effect on lanthanum manganese perovskite, and the catalytic performance of the obtained catalyst is remarkably superior to that of a single-strategy improved catalyst.

The invention discloses a self-assembled monomolecular material based on pyrene-carbazole diphosphate and a preparation method and application thereof, and belongs to the technical field of perovskite solar cells. According to the material, two carbazole units and a pyrene core are in conjugate connection to form a large conjugate plane structure, and the material has the following advantages: 1) a rigid molecular skeleton and an expanded conjugate system significantly improve thermal stability and chemical stability; 2) the conjugate plane of pyrene enhances intermolecular pi-pi accumulation, and promotes hole extraction and transmission; and 3) energy level matching is accurately regulated and controlled, a compact interface layer is formed, and electron-hole recombination is inhibited. When the hole transport layer is applied to the trans-perovskite solar cell, the photoelectric conversion efficiency and the long-term stability can be improved at the same time, and the hole transport layer has a good industrialization prospect.

The invention provides a solar laminated cell and a preparation method thereof, and a photovoltaic module, and relates to the field of photovoltaic technology, the solar laminated cell comprises a bottom cell and a top cell which are laminated along a first direction, and a composite layer is arranged between the bottom cell and the top cell. The top cell comprises a first transmission layer, a perovskite layer, a second transmission layer, a transparent conducting layer and a first electrode which are arranged in the first direction, the surface, facing the transparent conducting layer, of the perovskite layer is provided with a first suede structure, the first suede structure comprises a plurality of protruding parts, the height of the protruding parts in the first direction is D1, and the height of the second transmission layer is D1; the thickness of the perovskite layer along the first direction is D2, D1 and D2 meet the condition that D1 / D2 is greater than or equal to 0.1 and less than or equal to 0.3, the first suede structure is arranged on the perovskite layer, so that the solar laminated cell can absorb larger incident light, meanwhile, the contact area of the perovskite layer and the second transmission layer is increased, and the short-circuit current and the filling factor of the solar laminated cell are improved.

The invention discloses a preparation method and application of washable tin-based perovskite quantum dots, and the preparation method comprises the following steps: mixing cesium iodide powder, tin iodide powder and mesoporous silica powder, and then placing the mixture in a plasma ball mill for ball-milling diffusion, cesium iodide and tin iodide react in a confinement space of mesoporous silica to generate a CsSn I < 3 >-coated SiO2 composite structure, CsSn I < 3 > quantum dots are dispersed and coated in the mesoporous silica, and the application of the tin-based perovskite quantum dots in the anti-ultraviolet textile fabric is provided. The method has the following beneficial effects that the purpose of remarkably improving the stability of the tin-based perovskite quantum dots and the washing resistance of the textile is achieved.

The invention relates to an RP phase perovskite nanocrystal modified three-dimensional perovskite solar cell. The basic structure of the solar cell device comprises a transparent conductive substrate, an electron transport layer, a three-dimensional perovskite light absorption layer, an RP phase perovskite nanocrystalline layer, a hole transport layer and an electrode. The structural formula of the RP-phase perovskite nanocrystal is Cs2PbX4, wherein X is one or more of halide ions I <->, Br <-> and Cl <->; and the thickness of the film is 0.1-100nm. According to the method, the RP-phase perovskite nanocrystals can be synthesized in the air, the preparation process is simple, the synthesis cost is low, the quality of the RP-phase nanocrystal modified three-dimensional perovskite thin film is improved, the defect state density is reduced, the carrier recombination is reduced, and the photoelectric conversion efficiency of a solar cell device is remarkably improved.

The invention provides a preparation method of magnesium niobate, which comprises the following steps: carrying out wet ball milling on MgO and Nb2O5, uniformly mixing, and drying to obtain mixed powder; the mixed powder is heated to 1500-1700 DEG C for 1-3 h and then subjected to water quenching, and solid particles of a core-shell structure inclusion are obtained; and heating the solid particles to 1000-1200 DEG C, and carrying out heat preservation to obtain the magnesium niobate. Solid particles of a core-shell structure inclusion are formed through a water quenching process, then MN obtained through rapid heating sintering is high in purity and stability, Mg < 2 + > and Nb < 5 + > in the MN are high in uniformity and large in reaction activity, sufficient mixing with PbO and TiO2 at a high temperature is facilitated to form a liquid phase, the formed raw material for PMNT crystal growth is better in singleness and uniformity, and the preparation method is simple and easy to implement. Furthermore, the PMNT single crystal with a single perovskite structure, high purity and excellent piezoelectric property can be obtained, and the yield is improved.

The embodiment of the invention provides a perovskite solar cell and a preparation method and application thereof. The perovskite solar cell comprises a perovskite absorption layer and a vulcanization layer which are arranged in a stacked mode. The material of the vulcanization layer comprises a sulfonium salt organic matter, wherein cations of the sulfonium salt organic matter have a structure as shown in a formula (I). The material of the sulfide layer in the perovskite solar cell is the sulfonium salt organic matter, on one hand, the sulfonium salt organic matter is combined with the surface of perovskite, the stable sulfide layer is formed between the perovskite absorption layer and the carrier transport layer, ion defects are reduced, ion migration is effectively prevented, and the performance and stability of a device are improved; on the other hand, the hydrophobic group of the sulfonium salt organic matter can improve the hydrophobicity of the surface of the perovskite absorption layer, and the moisture resistance of the cell is improved.