23 results about "Lead(II) iodide" patented technology

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 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 method for preparing a heterojunction perovskite photodetector, comprising the following steps: preparing an electron transport layer; dissolving lead iodide and lead chloride in a mixed solution of dimethylformamide, N-methylformamide and N-methylpyrrolidone to obtain a precursor solution; in an air atmosphere, spin-coating the precursor solution onto the electron transport layer, immediately immersing into an anti-solvent after uniform spreading, and obtaining a PbI2-PbCl2 film after crystallization; spin-coating a methylammonium iodide solution onto the PbI2-PbCl2 film, and obtaining a perovskite film after vacuum annealing; spin-coating a long-chain ligand solution onto the three-dimensional perovskite film, vacuum annealing, and obtaining a perovskite heterojunction film; sequentially preparing a hole transport layer, a hole blocking layer and an anode on the perovskite heterojunction film to obtain the heterojunction perovskite photodetector. The method has the advantages that the prepared photodetector has high external quantum efficiency and high detection rate, and the preparation is simple.

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 discloses a methylamine formamidino perovskite single crystal, a preparation method thereof and an X-ray detector, and belongs to the technical field of perovskite single crystal X-ray detectors. Methyl iodide amine, formamidino hydriodate and lead iodide are used as raw materials, anhydrous acetic acid is used as an additive, growth is carried out in a solvent through a seed crystal method, and the methylamine formamidino perovskite single crystal is obtained. Anhydrous acetic acid and formamidine generate hydrogen-bond interaction, formamidine is pulled to enter crystal lattices, so that phase separation is eliminated, acetate and Pb coordinate to delay formation of a lead-iodine framework, the speed of methylamine and formamidine entering the crystal lattices is balanced, meanwhile, the stability of a methylamine formamidine perovskite precursor solution is improved, stable growth of methylamine formamidine perovskite single crystals is achieved, and the methylamine formamidine perovskite single crystals are obtained. The single crystal has the advantages of high crystallinity, low defect density, large size and favorable X-ray response performance. The methylamine formamidine perovskite single crystal is high in controllability in the growth process, and the preparation method is high in operability, simple and easy to implement, short in preparation period, low in equipment requirement and low in cost.

The invention provides a perovskite cell, a laminated cell, a photovoltaic module, a power utilization device and a power generation device, the perovskite cell comprises a perovskite thin film, the perovskite thin film comprises a perovskite material and a modifier, the modifier comprises lead iodide and an ammonium salt, the ammonium salt comprises at least one of compounds having a structural formula represented by a formula (1): R1R2R3R4N + Y-(1), in the formula (1), the Y-(1) is at least one of lead iodide and ammonium salt, and in the formula (1), the Y-(1) is at least one of lead iodide and ammonium salt. R1 comprises one of substituted or unsubstituted C4-C20 alkyl groups, and R2-R4 respectively and independently comprise one of a hydrogen atom and substituted or unsubstituted C1-C20 alkyl groups; y <-> comprises halogen ions and / or halogen-like ions, and N is a nitrogen atom. The perovskite cell provided by the invention has excellent photoelectric conversion efficiency and stability.

The invention relates to the technical field of film preparation, in particular to a preparation method for preparing an ultra-thick formamidine and methylamine mixed perovskite film through a blade coating method and application of the super-thick formamidine and methylamine mixed perovskite film through the blade coating method. The preparation method comprises the following steps that a precursor solution is prepared, specifically, methyl ammonium iodide, formamidine ammonium iodide and lead iodide are put into a ternary mixed solvent, and preparation of the precursor solution is completed; and performing deposition treatment, namely depositing the precursor solution prepared in the step 1 on a glass substrate by adopting a blade coating method to form a thin film, and completing the deposition treatment of the glass substrate. In the ternary mixed solvent, ethylene glycol monomethyl ether ensures rapid drying, N, N-dimethylformamide stabilizes the morphology of the wet film, dimethyl sulfoxide regulates and controls the crystallization process, and after the perovskite wet film prepared under the system is subjected to vacuum flash evaporation and thermal annealing, the perovskite wet film can be rapidly dried. And finally, the high-quality perovskite thin film with large crystal grains, uniform distribution, black and bright mirror surfaces on the upper surface and the lower surface and no void defect is formed, and the requirement of a high-performance solar cell on an active layer structure is met.

The invention discloses a preparation method of centimeter-sized needle-shaped lead iodide, which comprises the following steps: putting an iodine elementary substance and a lead elementary substance at one end in a quartz glass tube; vacuumizing and sealing the quartz glass tube; placing the sealed quartz glass tube in a tubular furnace, and simultaneously suspending one end without raw materials outside; performing first heat treatment to separate the iodine elementary substance from the lead elementary substance in the quartz tube; carrying out second heat treatment to melt the lead elementary substance and react with the iodine elementary substance; carrying out third heat treatment to enable the reaction to be fully carried out; and finally, cooling to room temperature to obtain centimeter-sized needle-shaped lead iodide.

The application discloses a MAPbI3 perovskite film based on defect competition regulation and a preparation method thereof. The preparation method of the MAPbI3 perovskite film based on defect competition regulation comprises the following steps: S1, methylammonium iodide and lead iodide are added into a solvent to obtain a precursor solution; S2, a substrate is pretreated; S3, the precursor solution is deposited on the substrate by adopting an anti-solvent spin coating method to obtain a precursor film; and S4, the precursor film is subjected to annealing treatment to obtain the MAPbI3 perovskite film based on defect competition regulation. The molar ratio of the methylammonium iodide and the lead iodide is (0.8-1.2):1. By adjusting the stoichiometric ratio of the precursor, the application realizes the synergistic regulation between the grain growth behavior and the defect kinetics, thereby reducing the non-radiation recombination, improving the carrier kinetic behavior and improving the stability of the perovskite film.

The invention relates to a method for improving the thermal stability of a perovskite material through chemical competitive coordination, and belongs to the technical field of photoelectric materials and device stability. According to the invention, a two-site additive eperisone hydrochloride (EH) is introduced into a lead iodide precursor solution, and competitive coordination with a residual solvent DMSO is realized in the preparation process of the perovskite device, so that volatilization of DMSO is effectively promoted, and multiple degradation pathways caused by DMSO are inhibited. The residual DMSO is easy to cause the formation of a nano gap at a crystal boundary, so that ion migration and non-radiative recombination are intensified; the moisture absorption characteristic can also initiate moisture infiltration, so that Pb-I bonds are promoted to be hydrolyzed and converted into a non-photoactive delta phase; meanwhile, lattice stress generated by local degradation can further cause irreversible PbI2 segregation. According to the passivation strategy, DMSO removal and vacancy passivation are remarkably promoted, meanwhile, the interface moisture resistance is enhanced, and the stability of the perovskite phase is cooperatively improved.

The present application belongs to the technical field of waste lead-acid battery resource and lead iodide crystal preparation, and discloses a method for preparing lead iodide crystal by reducing lead paste through a short wet process, which comprises the following steps: S1: collecting waste lead paste from waste lead-acid batteries and reducing the waste lead paste to obtain reduced lead paste; the reduced lead paste is placed in an iodine salt solution and stirred to obtain a preliminary reaction solution; S2: adding a hydroiodic acid solution to the preliminary reaction solution, and then performing solid-liquid separation to obtain a crude crystal; S3: dissolving the crude crystal in an organic solvent, and then performing solid-liquid separation; the obtained filtrate is a lead iodide solution; S4: recrystallizing the lead iodide solution, and then performing solid-liquid separation to obtain a purified lead iodide crystal. Through the improvement of the overall design of the reaction participants and the process flow, the preparation of the lead iodide crystal can be realized through a short process, and the technical problems of long process steps, large reagent input, and low purity of the lead iodide product can be effectively solved.

The application discloses a method for preparing FAPbI3 perovskite film by two-step blade coating in air. The method uses ionic liquid methylamine formate as a solvent of lead iodide to prepare a uniform and porous lead iodide film at a proper temperature, which is beneficial to the penetration reaction of formamidinium iodide in the second step of blade coating. Meanwhile, proper pressure applied by a blade in the second step of blade coating is also helpful to the penetration and reaction of formamidinium iodide. By the method, stable alpha-phase FAPbI3 perovskite can be obtained, the whole preparation process is carried out in air and on the same equipment, and the preparation of high-quality FAPbI3 perovskite film can be simply and quickly completed. Meanwhile, the method can be used for preparing large-area perovskite film, and has high industrialization prospect. Finally, the photoelectric conversion efficiency of the prepared device can reach 22.3%, which is in a leading position in the preparation of FAPbI3 perovskite photovoltaic devices by blade coating in air.

The invention relates to the technical field of lead iodide materials, and discloses a method for testing the molar ratio of lead to iodine in a lead iodide material, the lead iodide material comprises a lead iodide main component and impurities, the chemical formula of the lead iodide main component is PbxIy, the ratio of x to y is the molar ratio of lead to iodine in the lead iodide main component, and x is greater than or equal to 1. The mass percentage of the impurities in the lead iodide material is greater than or equal to 0 wt%; the test method comprises the following steps: carrying out X-ray diffraction test on the lead iodide material to obtain the variety and mass percentage of impurities; the method comprises the following steps: weighing a lead iodide material with the mass of m0, carrying out an inductively coupled plasma test to obtain the mass m1 of a lead element in the lead iodide material, obtaining the mass of an iodine element in the main component of lead iodide through the mass percentage of impurities, m0 and m1, and further obtaining the ratio of x to y in the main component of lead iodide. By adopting the test method, the test accuracy can be effectively improved, and the quality of lead iodide can be effectively ensured.

The application discloses a method for generating a broadband spectrum by using femtosecond laser etching MAPbI3, wherein methylammonium iodide and lead iodide are used to prepare MAPbI3 micrometer strips, a femtosecond laser with a specific wavelength is used to etch the MAPbI3 micrometer strips, and a femtosecond laser with another wavelength is used to excite the etched sample, so that a broadband spectrum is successfully generated; a variety of spectral characterization technologies are combined to confirm that the broadband spectrum is derived from self-trapped exciton (STE) luminescence, and structural characterization and theoretical analysis reveal that the femtosecond laser etching causes the loss of specific ions in the material, triggers lattice distortion, and further induces the formation of STE.

The invention relates to the technical field of photoelectric conversion materials, in particular to a perovskite precursor material for photoelectric conversion and a preparation method thereof. The precursor material is prepared from the following raw materials: lead iodide, stannous iodide, methyl amine iodide and a modified hyperbranched polymer; the modified hyperbranched polymer is prepared from the following raw materials in parts by weight: 2 to 3 parts of triethyl borate, 2 to 3 parts of 1, 3-propylene glycol, 0.5 to 0.8 part of 2-amino-6-chlorobenzimidazole, 0.3 to 0.5 part of acryloyl chloride, 0.3 to 0.4 part of acrylic acid, 1 to 1.5 parts of trifluoroethyl methacrylate and 0.4 to 0.6 part of dopamine. The prepared perovskite precursor can improve the photoelectric conversion efficiency and improve the stability.

A process for preparing a perovskite-based ink, the perovskite having general formulawherein y is between 00.2, including the following steps:(a) dissolving lead iodide (PbI2) in at least one organic solvent, obtaining a first solution;(b) dissolving cesium iodide (CsI) and at least one ammonium salt having general formula:wherein R represents a linear or branched C1-C4 alkyl group, in a part of the first solution, obtaining a second solution;(c) dissolving cesium iodide (CsI) and at least one ammonium salt having general formula:wherein R represents a linear or branched C1-C4 alkyl group, obtaining a third solution;(d) mixing the second solution with the third solution obtaining a perovskite-based ink;wherein in step (d) the molar ratio between the at least one ammonium salt and the at least one ammonium salt is between 0:100 and 50:50.

The application belongs to the technical field of photocatalysis, and particularly relates to a benzylamine lead iodine / molybdenum disulfide photocatalyst, a preparation method and application thereof, and a photocatalytic overall water splitting method. The preparation method comprises the following steps: mixing benzylamine and hydroiodic acid, and evaporating a solvent to obtain PMAI; dissolving lead iodide in hydroiodic acid, adding PMAI, crystallizing after heating and keeping warm, cooling, and separating to obtain PMA2PbI4 and a PMA2PbI4 saturated solution; soaking MoS2 powder in a n-butyl lithium solution, separating and washing a precipitate, and ultrasonically peeling to obtain MoS2 nanosheets; adding PMA2PbI4 and the MoS2 nanosheets to the PMA2PbI4 saturated solution, reacting after heating, cooling, and collecting a precipitate to obtain the benzylamine lead iodine / molybdenum disulfide photocatalyst. The benzylamine lead iodine / molybdenum disulfide photocatalyst can stably produce hydrogen in a dilute HI solution and has excellent activity, and can be placed in the same reaction system with an oxygen production catalyst to realize photocatalytic overall water splitting.

The application relates to the technical field of photoelectric conversion materials, in particular to a perovskite precursor material for photoelectric conversion and a preparation method thereof. The preparation raw material of the precursor material comprises the following components: lead iodide, stannous iodide, methyl amine iodide and modified hyperbranched polymer; the preparation raw material of the modified hyperbranched polymer comprises the following components in parts by weight: triethyl borate 2-3 parts, 1,3-propanediol 2-3 parts, 2-amino-6-chlorobenzimidazole 0.5-0.8 parts, acryloyl chloride 0.3-0.5 parts, acrylic acid 0.3-0.4 parts, trifluoroethyl methacrylate 1-1.5 parts and dopamine 0.4-0.6 parts; the prepared perovskite precursor can improve photoelectric conversion efficiency and stability.

The invention relates to a process for treating and recovering lead in a lead-based perovskite solar cell based on anti-solvent and resin treatment, and belongs to the field of perovskite cell heavy metal recovery. Comprising the following steps: disassembling a waste battery, dissolving a perovskite layer with a good solvent to obtain a solution A, taking a supernatant B, adding a proper amount of an anti-solvent, determining whether an iodine source is added or not according to a concentration range, and precipitating out most of lead iodide after the anti-solvent is added to obtain a supernatant C; and recrystallizing, purifying and drying the lead iodide precipitate, and then applying the lead iodide precipitate to the perovskite battery again. The supernate C continues to serve as an anti-solvent to repeat the steps, and internal circulation of the lead ions is achieved. And treating the supernate C with ion exchange resin, adsorbing lead ions, and discharging after reaching the standard, or continuously serving as an anti-solvent. Lead ions in saturated resin are desorbed by dilute acid and converted into other lead compounds, the resin is recycled, and the lead compounds can be used for preparing lead iodide. According to the invention, more than 99.9% of lead ions can be recovered, and high-purity and high-value lead iodide can be obtained.

The application relates to the field of solar cells, in particular to high-purity single-phase FAPbI3 microcrystals, a perovskite film and a preparation method thereof. The preparation method of the high-purity single-phase FAPbI3 microcrystals comprises the following steps: mixing lead iodide, iodomethanimine and a solvent, reacting to obtain a precursor liquid; stirring and crystallizing the precursor liquid to obtain microcrystals; and drying the microcrystals to obtain high-purity single-phase FAPbI3 microcrystals. The preparation method of the perovskite film comprises the following steps: mixing the high-purity single-phase FAPbI3 microcrystals and a solvent, dispersing to obtain ink; depositing a hole transport layer on a substrate, then coating the ink on the hole transport layer, and sequentially performing drying, solidification and annealing treatment to obtain the perovskite film. The application adopts an inverse temperature crystallization-solvent shearing synergistic process, aims to obtain high-purity single-phase FAPbI3 microcrystals with a specific specification of a particle size distribution of 100+ / -20 mu m through physical and chemical double purification.

The invention discloses a perovskite nanorod for producing a C2 product by photocatalysis of CO2 and a preparation method of the perovskite nanorod. The nanorod is CPIO, has a nanorod structure with the diameter of 100-150 nm and the length of 1-3 [mu] m, is of a polycrystalline structure, has a specific diffraction crystal face under a specific crystal zone axis, and is uniform in element distribution, and oxygen is mainly distributed on the surface. The preparation method comprises the following steps: refluxing lead iodide, oleylamine and oleic acid in octadecene under vacuum to obtain a solution; adding a cesium oleate solution under the protection of nitrogen, reacting, and treating to obtain a crystal; and refluxing the crystal and methyl iodide to obtain the catalyst. The preparation is simple, the cost is low, the catalyst can efficiently photocatalyze CO2 in a gas-solid system to produce a C2 product, and a new method is provided for related fields.