37 results about "Caesium iodide" patented technology

The invention belongs to the technical field of photoelectric materials and devices, and particularly relates to a perovskite thin film and a preparation method and application thereof. A fluorine-containing phosphazene compound is used as a ligand and is mixed with a perovskite precursor solution composed of lead iodide, formamidine iodine and cesium iodide, spin coating is performed, the fluorine-containing phosphazene compound and part of formamidine cations form hydrogen bonds, part of formamidine cations are anchored at the bottom of a perovskite film, Cs-formamidine cations are uniformly distributed, and the perovskite film is prepared. Meanwhile, the fluorine-containing phosphazene compound and Pb < 2 + > form a coordinate bond, Pb < 2 + > defects are passivated, and the perovskite thin film is obtained through anti-solvent treatment and annealing treatment. The fluorine-containing phosphazene compound interacts with the components in the perovskite precursor solution, so that the nucleation rate of perovskite can be increased, the crystallization rate can be slowed down, the tensile stress can be eliminated, the perovskite does not enter crystal lattices, and the stability and crystallinity of the film are guaranteed. The perovskite thin film can be used for an inverted perovskite solar cell, and the performance and the stability of a device are improved.

The invention discloses a sulfaguanidine modified inorganic tin-based perovskite light-emitting diode and a preparation method thereof, and belongs to the field of luminescent material preparation, the preparation method comprises the following steps: preparing a perovskite precursor solution which comprises cesium iodide, stannous iodide, sulfaguanidine and an organic solvent; applying the perovskite precursor solution to a substrate to form a wet film; carrying out annealing treatment on the wet film so as to form a perovskite light-emitting layer containing CsSnI3 perovskite and sulfaguanidine; a hole transport layer is formed on an anode conductive substrate, and a perovskite light-emitting layer is adopted on the hole transport layer; and sequentially forming an electron transport layer, an electron injection layer and a cathode electrode on the perovskite light-emitting layer. The process is simple and suitable for popularization and application.

The application belongs to the technical field of photovoltaic devices, and relates to preparation and application of a multifunctional organic additive doped CsSnI3 perovskite film; during preparation, a perovskite spin coating liquid is spin coated on an ITO glass substrate to form a precursor film, and the precursor film is subjected to annealing treatment to obtain a CsSnI3 perovskite film; the perovskite spin coating liquid is formed by adding stannous fluoride and 3-amino-pyrazine-2-carboxamide (3-APCA) to a perovskite precursor solution and stirring; the perovskite precursor solution is formed by dissolving cesium iodide and stannous iodide in an organic solvent; and the application is applied to solar cells, light-emitting diodes, photoelectric detectors, photoelectric catalysis and energy storage. The method introduces the multifunctional organic additive 3-APCA, realizes Sn 2+ oxidation inhibition, optimizes film crystallinity and passivates defects, and significantly improves the quality of the CsSnI3 perovskite film; and the application range is wide.

The application discloses a preparation method of a wide-bandgap perovskite photoactive layer, and comprises the following steps: S1, lead iodide powder, cesium iodide powder and ytterbium bromide powder are proportioned according to a proportioning molar ratio, and an inorganic target material is prepared by using a hot-press sintering process; S2, formamidinium hydriodide powder and methylammonium bromide powder are proportioned according to a proportioning molar ratio, and an organic target material is prepared by using a normal-temperature preparation process; S3, a pretreated substrate is placed on a magnetron sputtering sample table, the target materials prepared in steps S1 and S2 are respectively installed on corresponding radio frequency sputtering targets, and the background of a magnetron sputtering system is vacuumized; S4, high-purity argon gas is used as a sputtering gas, and a wide-bandgap perovskite thin film is prepared by using a magnetron co-sputtering method; the sputtering power of the inorganic target material prepared in step S1 is controlled, the sputtering power of the organic target material prepared in step S2 is controlled, and the thickness of the thin film is controlled, so that the high-quality thin film is prepared by using the differential target material preparation process.

The application discloses a preparation method and application of high-purity cesium iodide, which comprises the following steps: firstly, mixing an industrial-grade cesium source powder and an iodine source solution, and preparing a solid powder after vacuum rotary evaporation and drying; then repeatedly washing the powder by using a special detergent, removing impurities, and drying; sintering at a temperature of 200-350 DEG C; dissolving the sintered powder in deionized warm water, and cooling and crystallizing at 0 DEG C; and finally collecting and drying the crystallization product to obtain the high-purity cesium iodide (CsI) finished product. The CsI powder prepared by the application has a purity of more than 99.99%, can obtain more excellent comprehensive performance, and has a simple and controllable process, and has a wide application prospect in the field of perovskite solar cells.

The invention discloses a preparation method of polycation black-phase perovskite microcrystal powder, and belongs to the technical field of new energy and photoelectric materials. The method comprises the following steps: dissolving formamidine iodide (FAI), cesium iodide (CsI), lead iodide (PbI2) and an accelerant n-propylamine hydrochloride (PACl) in an alcohol solvent according to a designed molar ratio to prepare a 0.2-2 mol.L <-1 > uniform solution, and heating and stirring to form a black precipitate; and quickly filtering, washing by using an alcohol solvent to remove the residual additive, and carrying out vacuum drying to obtain the high-purity black-phase microcrystalline powder. The prepared powder has uniform Cs / FA distribution, does not contain any yellow phase, remarkably inhibits cation segregation, improves the crystallization quality and phase stability, is simple in preparation process, is easy to remove auxiliary agent residues, and can be widely applied to preparation of photoelectric devices such as high-efficiency perovskite solar cells and the like.

The invention relates to a perovskite precursor solution, a perovskite thin film, a preparation method of the perovskite thin film and a photovoltaic module. The perovskite precursor solution comprises a perovskite precursor, an additive and a mixed solvent; the perovskite precursor is prepared from formamidine hydriodate and lead iodide; the additive comprises cesium iodide and methylamine hydrochloride; the mixed solvent is prepared from N, N-dimethyl formamide, N-methyl pyrrolidone and cyclohexyl pyrrolidone. The composition of the perovskite precursor solution is blended, the high-quality perovskite thin film with the micro-suede surface is spontaneously formed in the perovskite crystallization process, the micro-suede surface structure can increase the contact area between a perovskite layer and a subsequent functional layer, a tight mechanical interlocking effect is generated between the micro-suede surface structure and the interface of the functional layer, and the performance of the perovskite thin film is improved. Therefore, the interface adhesive force of the subsequent functional layer and the metal electrode is obviously improved, and the problem of performance degradation of the perovskite assembly caused by the packaging process is solved.

The invention provides a cesium iodide crystal detector packaging structure and method, and belongs to the technical field of high-energy physical detectors. The cesium iodide crystal detector packaging structure comprises two groups of optical fiber modules, two groups of optical fiber readout SiPM, two groups of crystal readout SiPM and cesium iodide crystals, the two groups of optical fiber modules are tightly attached to the upper surface and the lower surface of the cesium iodide crystal respectively and are orthogonally arranged; the two groups of optical fiber reading SiPMs are respectively arranged on the two groups of optical fiber modules and are used for reading photons propagating to the tail ends of the optical fibers; the two groups of crystal read-out SiPMs are respectively clung to the two side surfaces of the cesium iodide crystal, are orthogonally arranged and are used for reading out photons propagating to the side surfaces of the cesium iodide crystal. According to the invention, photon number measurement can be provided while position resolution is measured, and the energy resolution capability is improved; the structure optimization degree is high, and substance interference does not exist on an incident particle path; the structure is convenient to install, corresponding operation is adopted, and detector packaging can be effectively completed.

The invention provides a solar cell based on a Cu-doped lead-copper alloy perovskite light absorption layer and a preparation method of the solar cell, and the light absorption layer of the solar cell is a Cu-doped lead-copper alloy perovskite thin film Cs0. 05MA 0. 10FA 0. 85Pb1-xCuxI3, the preparation method of the lead-copper alloy perovskite thin film comprises the following steps: adding formamidine hydriodate, methylamine hydriodate, cesium iodide, lead iodide and cuprous iodide powder into a solvent, and uniformly stirring and mixing to prepare a perovskite precursor solution; the PbI2 powder and the CuI powder are uniformly mixed, the uniformly mixed precursor solution is spin-coated, annealing is carried out on a heating stage, the thin film is obtained, the ratio of the PbI2 powder to the CuI powder is 1-x: x, and x is equal to 0-10%. The copper-doped lead-copper alloy perovskite with the three-dimensional octahedral structure synthesized by the method has structural and thermodynamic stability and is high in fluorescence performance and light absorption performance, and the crystallization quality of a thin film is remarkably improved; when the perovskite thin film is used as a light absorption layer of the cell, a perovskite solar cell with high photoelectric conversion efficiency can be prepared, and the perovskite solar cell has excellent ultraviolet resistance and high temperature resistance stability.

The present application relates to the field of perovskite microcrystal, and particularly relates to a black-phase CsPbI3 perovskite microcrystal, a full-inorganic thin film and a preparation method thereof.The preparation method comprises the following steps: mixing cesium iodide, lead iodide and a solvent to obtain a precursor solution; mixing the precursor solution, a heterogeneous metal ion stress inducer and a perfluorinated organic ligand, and performing a reaction to obtain the black-phase CsPbI3 perovskite microcrystal.The preparation method of the full-inorganic thin film comprises the following steps: mixing the black-phase CsPbI3 perovskite microcrystal and a high-polarity solvent, and performing dispersion to obtain ink; coating the ink on a substrate, and performing annealing treatment to obtain the full-inorganic thin film.The present application rewrites the thermodynamic stability interval by introducing a lattice stress field in the microcrystal synthesis stage, and realizes low-temperature preparation of the full-inorganic thin film by using the phase template effect.

This invention belongs to the field of scintillator material preparation technology, specifically relating to a method for purifying high-purity cesium iodide and its application in the preparation of cesium iodide scintillator screens. The method involves sequentially mixing and heating cesium iodide-containing waste and residual materials to dissolve them, filtering and removing impurities, adsorption and removing impurities, concentrating and temperature-controlled crystallization, centrifuging, drying, and vacuum packaging. This process comprehensively removes solid particulate impurities, elemental iodine, and various trace metal ions from the raw materials, effectively preventing oxidation and deterioration during purification. The method is simple to operate, highly industrially feasible, and can purify waste materials to a high purity level that meets the requirements of high-performance applications. It allows for the reuse of waste materials at the same purity level, reducing production costs, alleviating raw material supply pressure, and complying with environmental protection requirements. Applying the high-purity cesium iodide obtained by this method to the preparation of cesium iodide scintillator screens using a vacuum thermal evaporation process ensures the excellent performance of the scintillator screens, making them suitable for high-end fields such as medical imaging and non-destructive testing.

The invention discloses a cesium iodide nanocrystalline composite chalcogenide glass ceramic and a preparation method thereof, the chemical formula of the cesium iodide nanocrystalline composite chalcogenide glass ceramic is xGa2S3-ySnS2-(1-x-y) CsI, x is more than or equal to 0.2 and less than or equal to 0.3, and y is more than or equal to 0.2 and less than or equal to 0.6; the preparation method comprises the following steps: preparing a glass mixture according to a chemical formula by taking simple substances Ga, Sn and S and a compound CsI as raw materials; placing the glass mixture in a sealed vacuum quartz ampoule, carrying out melt firing at 850-900 DEG C for more than 12 hours, taking out the glass mixture at 650-700 DEG C, and quenching to form glass; carrying out annealing treatment on the formed glass at 250-290 DEG C / min for 4-6 hours, and then cooling to room temperature at a rate of 0.05-0.2 DEG C / min; and carrying out heat treatment on the obtained matrix glass at 350-390 DEG C for 5-20 hours, and then carrying out furnace cooling to room temperature. The chalcogenide glass ceramic contains uniformly distributed CsI nanocrystals, has good thermal and chemical stability and mechanical strength, and can be used in the technical fields of X-ray detection and infrared thermal imaging.

The invention relates to the technical field of semiconductor light-emitting devices, and discloses a preparation method of a high-color-purity blue light LED, which comprises the following steps of: mixing cesium iodide and cuprous iodide and reacting to prepare a Cs3Cu2I5 nuclear material; the Cs3Cu2I5 core material is placed in a shell layer precursor solution containing a gallium source to be wrapped and then annealed, and core-shell structure fluorescent powder is obtained; preparing the fluorescent powder with the core-shell structure into slurry, coating a base material with the slurry layer by layer, and performing high-temperature treatment to form a fluorescent material film with Ga concentration gradient; and integrating an ultraviolet LED chip with the fluorescent material film to prepare the high-color-purity blue light LED. According to the invention, the core-shell passivation structure and the concentration gradient film are constructed, and the functionalized packaging resin is matched, so that the quantum yield, the color purity, the light extraction efficiency and the long-term working stability of the blue light LED are improved.

This invention discloses a method for preparing inorganic perovskite thin films assisted by cystamine dihydrochloride. This invention relates to the field of optoelectronic materials and devices, and includes the following specific steps: Step 1: Weigh cesium iodide, lead iodide, and dimethylamine hydroiodide as raw materials, select DMF as the solvent, and then slowly add these raw materials to the DMF solvent. Stirring is performed at room temperature to obtain an inorganic perovskite precursor solution. The advantages of this invention are: by selecting cesium iodide, lead iodide, and dimethylamine hydroiodide in the inorganic perovskite precursor solution, it provides the basic elements for constructing the perovskite crystal structure, ensuring that the thin film possesses basic optoelectronic properties. It enhances the adhesion between the thin film and the substrate, effectively alleviates stress caused by differences in thermal expansion coefficients, and greatly suppresses the structural phase transition of the thin film under high-temperature conditions, successfully solving the problem of a sharp decline in the optoelectronic performance of thin films at high temperatures in existing technologies.

A scintillation crystal can include a cesium halide that is co-doped with thallium and another element. In an embodiment, the scintillation crystal can include CsI:Tl, Me, where Me represents co-doped Sb and Bi. In a particular embodiment, the scintillation crystal may have a cesium iodide host material, a first dopant including a thallium, a second dopant including an antimony, and a third dopant including a bismuth.

The invention discloses a lead-tin perovskite thin film and a preparation method and application thereof, and particularly relates to the field of photoelectric materials and devices. Comprising a bottom-buried interface layer, a lead-tin perovskite layer and an upper interface modification layer which are sequentially arranged from bottom to top, the lead-tin perovskite layer is formed by a lead-tin perovskite precursor solution, and the lead-tin perovskite precursor solution comprises the following components: a two-dimensional perovskite single crystal, lead iodide, stannous iodide, methylamine iodine, formamidine iodine, stannous fluoride and cesium iodide; and the component of the two-dimensional perovskite single crystal is PEA2PbI4. A two-dimensional perovskite single crystal is added into a Pb-Sn perovskite precursor to serve as a heterogeneous nucleation site, Pb-Sn perovskite is guided to longitudinally grow in the direction perpendicular to a substrate, transverse grain boundaries are reduced, and the crystallization quality is improved; meanwhile, as a buried interface and an upper interface modification layer, efficient transmission and extraction of photon-generated carriers in a Pb-Sn perovskite thin film and high efficiency and stability of a Pb-Sn perovskite cell can be realized.

The invention provides cesium iodide and a preparation method thereof, a solar cell and a preparation method thereof, and a photovoltaic module, and the cesium iodide comprises a first substance with reducibility. The cesium iodide provided by the invention is good in stability and easy to store, and the solar cell prepared from the cesium iodide provided by the invention has improved photoelectric conversion efficiency and device stability.

The invention relates to the technical field of photovoltaic cells, and provides a preparation method of a perovskite thin film and a perovskite cell, and the preparation method of the perovskite thin film comprises the steps: preparing a perovskite precursor solution: dissolving cesium iodide, lead iodide and formamidine iodide in dimethyl sulfoxide (DMSO) to obtain a first solution; dissolving molecules with a bipyridine group and a diphosphate group in an N, N-dimethylformamide (DMF) solution to obtain a second solution; mixing the first solution and the second solution to obtain a perovskite precursor solution; preparing a perovskite thin film: coating the perovskite precursor solution on the top surface of a substrate to perform film forming treatment, and performing annealing treatment to obtain the perovskite thin film; the molecules with the bipyridine group and the diphosphate group comprise 2, 2 '-bipyridine-4, 4'-diphosphon.By means of the method, the problems that internal and surface defects exist in the perovskite thin film, carrier transport is limited by the defects, and the photoelectric conversion efficiency of a perovskite cell is restrained can be solved.

The invention discloses a preparation method of cesium iodide, cesium iodide and application, and relates to the technical field of inorganic materials. According to the preparation method disclosed by the invention, the original crystal form morphology of cesium iodide is changed by adding a specific type of surfactant and using a high-temperature and high-pressure hydrothermal reaction, so that polyhedral crystal forms such as a truncated octahedron, a cube and a rhombic dodecahedron are formed, the specific surface area of cesium iodide is further increased, a larger contact area can be provided, and the stability of a product is improved; and the solubility of cesium iodide in an organic solvent can be improved, and the application effect of cesium iodide in a perovskite material is improved.

The invention discloses a high-stability 2D / 3D tin-based perovskite (CsSnI3) heterojunction thin film transistor and a full-evaporation preparation method. The method comprises the following steps: sequentially evaporating a stannous iodide layer, a stannous fluoride layer, a lead chloride intermediate layer and a cesium iodide layer on a P-type silicon / SiO2 substrate; and annealing to form a two-dimensional Cs2PbI2Cl2 covering layer on the top of the CsSnI3 thin film in situ, thereby constructing the CsSnI3 perovskite semiconductor thin film with a 2D / 3D heterostructure. And finally evaporating gold source and drain electrodes. Compared with a non-doped device, the current switch ratio of the prepared transistor is improved by about 2 orders of magnitude, the mobility is improved by dozens of times, and the threshold voltage is remarkably reduced; and particularly, the air stability is revolutionarily improved, and the stable working time of the device in the air is greatly prolonged to more than 24 hours from the minute level (undoped). The method is simple in process and low in cost, and an effective way is provided for large-area preparation of high-performance and high-stability tin-based perovskite electronic devices.

The application belongs to the technical field of solar cells, and provides a preparation method of inorganic perovskite nanowire film. First, lead iodide is dissolved and stirred uniformly under constant temperature to obtain a lead iodide precursor solution; a precipitating agent is added to the lead iodide precursor solution to obtain light yellow flocculation, and the light yellow flocculation is centrifuged to obtain light yellow colloidal material, which is vacuum dried to obtain a lead iodide composite product; a precursor spin coating solution is obtained based on the lead iodide composite product, the precursor spin coating solution is spin coated on a substrate to form a film, and annealing treatment is performed to obtain a loose lead iodide film layer; the lead iodide film layer is sequentially immersed in a cesium iodide solution and a cesium bromide solution, and then annealing treatment is performed to obtain an inorganic perovskite film, so that the loose PbI2 nanostructure can fully contact and react with the cesium iodide solution and the cesium bromide solution, and a one-dimensional inorganic perovskite nanowire material with good orientation, excellent physical and chemical stability and high crystallinity is prepared.

This invention relates to an inorganic perovskite thin film, its preparation method, and a solar cell. The method includes the following steps: S1: forming a first thin film through a first vapor deposition process; S2: annealing the first thin film to obtain a second thin film; S3: forming a third thin film on the second thin film through a second vapor deposition process; and S4: annealing the second thin film and the third thin film to obtain the inorganic perovskite thin film; wherein, in the first vapor deposition process, the raw materials used for evaporation include cesium bromide and lead iodide; and in the second vapor deposition process, the raw materials used for evaporation include cesium iodide and lead iodide. The inorganic perovskite thin film prepared by the method of one embodiment of this invention, compared with existing inorganic perovskite thin films, improves the phase stability of the perovskite structure without affecting the light absorption range of the prepared solar cell, and simultaneously improves the photoelectric conversion efficiency of the cell.

The application belongs to the technical field of photoelectric materials and devices, and particularly relates to a perovskite film and a preparation method and application thereof. A fluorine-containing phosphazene compound is used as a ligand, mixed with a perovskite precursor solution composed of lead iodide, formamidinium iodide and cesium iodide, and then spin-coated. The fluorine-containing phosphazene compound forms a hydrogen bond with part of the formamidinium cations, anchors the part of the formamidinium cations at the bottom of the perovskite film, and makes the Cs-formamidinium cations uniformly distributed. Meanwhile, the fluorine-containing phosphazene compound forms a coordination bond with Pb 2+ , passivates Pb 2+ defects, and the perovskite film is obtained through an anti-solvent treatment and an annealing treatment. The fluorine-containing phosphazene compound interacts with components in the perovskite precursor solution, can increase a nucleation rate of the perovskite, slow down a crystallization rate, eliminate a tensile stress, and not enter a crystal lattice, thereby guaranteeing stability and crystallinity of the film. The perovskite film can be used for an inverted perovskite solar cell, and can improve device performance and stability.

The present invention relates to the field of perovskite solar cells, and discloses a uniformly oriented quasi-single crystal perovskite film and its preparation method and application. The preparation method comprises: using at least one of N,N-dimethylpropylene urea, methylphenyl sulfoxide, and ethylsulfinylethane as a solvent additive and N,N-dimethylformamide to prepare an organic mixed solvent, dissolving lead iodide and cesium iodide and / or rubidium chloride in the organic mixed solvent and then coating, heating, to obtain a lead iodide film; depositing an organic amine salt solution on the lead iodide film, and annealing to obtain a perovskite film. The present invention reduces the reactivity of the lead iodide precursor by introducing solvent additives with different coordination abilities, effectively delaying the kinetic process of the perovskite formation reaction, thereby promoting the full reaction of the organic amine salt and the lead iodide intermediate phase, and effectively solving the problems of residual lead iodide impurities and poor crystallization quality in the perovskite film in the traditional two-step method.

Disclosed is a perovskite precursor solution for improving stability of a perovskite solar cell. Iodoformamidine and cesium iodide are added into a solvent, and bromomethylamine, lead iodide and 3,4-dichloroaniline are added after stirring to obtain the perovskite precursor solution. The perovskite precursor solution is spin-coated on a substrate, obtaining a perovskite thin film by thermal annealing as a light absorption layer of the solar cell. The perovskite precursor solution prepared by the present invention replaces an existing perovskite layer, the defects in the existing perovskite mineralization technology are solved. The perovskite stability improvement leads lower requirements for the process environment and convenient preparation method, realizes the long-time stable performance in a common environment.

This invention discloses a perovskite solar cell and its fabrication method, comprising: ultrasonically cleaning a substrate sequentially with a mixture of domestic water and glass cleaning agent, domestic water, and anhydrous ethanol, followed by drying with a nitrogen blower, and then treating it with an ultraviolet-ozone device; spin-coating an electron transport layer onto the treated substrate surface; dissolving lead iodide, formamidinium hydroiodate, methylamine iodide, methylamine chloride, cesium iodide, rubidium iodide, L-α-phosphatidylcholine, and phenylethylamine chloride in a mixture of N,N-dimethylformamide, dimethyl sulfoxide, and ethylene glycol monomethyl ether to obtain a perovskite precursor solution; scraping the perovskite precursor solution onto the surface of the electron transport layer to form a perovskite layer; spin-coating a hole transport layer onto the surface of the perovskite layer; and evaporating an electrode layer onto the surfaces of the hole transport layer and the substrate. This invention improves the coating speed and process efficiency while ensuring good device performance and stability.

The image quality and useful life of an x-ray imaging detector is enhanced by adding a shield layer between the photodiode / thin film transistor (TFT) array and the cesium iodide (CsI)-based scintillator / scintillator layer. The shield layer prevents dynamic charge coupling between a CsI / parylene layer located above the shield layer and the conductive data transfer lines located below the shield layer and operably connected to the individual pixels of the photodiode / TFT array to effectively maintain the level of various image quality parameters over time, including the modulation transfer function (MTF), and the Signal to Noise Ratio (SNR).

The present invention belongs to the technical field of purification of activators for cesium iodide scintillating screens, and specifically relates to a purification system, purification method, and application of activators for cesium iodide scintillating screens. The activator purification system provided by the present invention includes a heating and separation device for separating solid activators for cesium iodide scintillating screens and a heating and melting device for further purifying the solid activators. The heating and separation device is mainly used to remove cesium iodide and impurities such as furnace wall dust, metal particles, and glass particles from waste materials. The heating and melting device melts and evaporates the separated activators, removes residual impurities again, and obtains a high-purity activator. In addition, the present invention also provides an activator purification method, which achieves the purpose of purifying the activator through heating and dissolving, screening and filtering, pure water washing, melting and evaporating, and condensing and collecting. The entire purification process is environmentally friendly and safe, does not generate secondary pollution, and the purified activator can be directly used in the production of cesium iodide crystal single crystals and the preparation of cesium iodide scintillating screens.

The application discloses a laser photolysis-infrared spectrum combined technology-based atmospheric cl intermediates generation and detection system and a detection method, and the system comprises a low-pressure flow tube sampling module, a excimer laser photolysis module, a high-vacuum ultralow-temperature reaction cell module and an in-situ Fourier transform infrared spectrum detection module; the low-pressure flow tube sampling module is used for conveying mixed gas to the high-vacuum ultralow-temperature reaction cell module; the excimer laser photolysis module is used as a photolysis source and is guided to the high-vacuum ultralow-temperature reaction cell module through an optical path; and the in-situ Fourier transform infrared spectrum detection module is used for collecting and analyzing infrared spectrum of a captured sample on a cesium iodide cold window surface of the high-vacuum ultralow-temperature reaction cell module. Through the low-pressure flow tube premixing and the working mode of "photolysis and deposition simultaneously", the application can efficiently and in-situ generate CIs in an ultralow-temperature matrix isolation environment, and realize high-sensitivity and high-specificity infrared detection.

This invention relates to perovskite thin films and provides a method for preparing two-dimensional / three-dimensional perovskite thin films, comprising the following steps: spin-coating a SnO2 solution onto a substrate and annealing; dissolving lead iodide, lead bromide, formamidinium iodide, and methylamine bromide in a mixed solution of DMSO and DMF, and adding cesium iodide dissolved in DMSO solution to the above solution; spin-coating onto a substrate and adding chlorobenzene; spin-coating magnetic nanoparticles of iron(III) oxide and a p-phenylenediamine iodide isopropanol solution onto the film under a magnetic field and annealing; dissolving Spiro-OMeTAD in a chlorobenzene solution, dissolving Li-TFSI in acetonitrile, and adding it along with TBP to the Spiro-OMeTAD solution and spin-coating onto the film surface; and depositing a metallic silver electrode. This invention provides a method for preparing two-dimensional / three-dimensional perovskite thin films. This invention also provides an application of two-dimensional / three-dimensional perovskite thin films in the fabrication of perovskite solar cells. This invention effectively improves the quality and stability of perovskite thin films.