147 results about "Hydroiodic acid" patented technology

The invention discloses an inorganic-organic hybrid compound crystal and a preparation method thereof, and belongs to the technical field of organic-inorganic hybrid materials. The preparation method comprises the following steps: mixing raw materials containing hydroiodic acid, organic cage molecules RCC3 and a lead source with a solvent, and carrying out solvothermal reaction to obtain the inorganic-organic hybrid compound crystal. The chemical formula of the prepared inorganic-organic hybrid compound crystal is ({H18 [C72H108N12] 2 [(Pb10I36)]}. 2I), wherein [C72H108N12] is RCC3 acidified by hydroiodic acid, the crystal has a supramolecular three-dimensional structure assembled by a [Pb5I8] 3-anion cluster unit and a protonated RCC3 molecular cage through electrostatic and hydrogen-bond interaction, and belongs to a monoclinic system, and the space group is P21. The crystal structure is a metal halide-based organic-inorganic hybrid crystal constructed by taking an organic molecular cage as nitrogen-containing cations and lead iodide for the first time.

The invention provides a perovskite passivation layer and a preparation method thereof. According to the invention, a perovskite passivation layer is arranged on the surface of a perovskite absorption layer, and the material of the perovskite passivation layer contains an alkyl diamine compound and a phenylethyl ammonium compound; the phenethyl ammonium compound is selected from p-trifluoromethyl phenylethylamine hydrochloride and / or p-fluorophenethyl hydriodate. According to the perovskite solar cell and the preparation method thereof, the alkyl diamine compound and the phenylethyl ammonium compound are cooperated to form the passivation layer, the simultaneous effect of surface passivation and interface passivation can be exerted, the carrier recombination of the surface and the interface is reduced, the electron extraction capability is improved, and the energy conversion efficiency of the perovskite solar cell is further improved.

The invention belongs to the technical field of chemical synthesis, and relates to a black-phase formamidine lead iodide microcrystal as well as a preparation method and application thereof. The invention provides a preparation method of black-phase formamidine lead iodide microcrystals. The preparation method comprises the following steps: mixing a salt compound containing divalent lead, hydriodic acid, formamidine acetate, a reducing acid compound for inhibiting oxidation of iodine anions and deionized water as precursor liquid; and performing high-pressure hydrothermal treatment on the precursor liquid to obtain the black-phase formamidine lead iodide microcrystal. According to the preparation method provided by the invention, water is adopted as a solvent, so that the use of an organic solvent is avoided, and the prepared black-phase formamidine lead iodide microcrystal has high crystallinity and stability and can be stored in a room-temperature air condition for a long time without phase change.

The invention relates to the technical field of flow batteries, in particular to a bromine-chromium flow battery system. According to the invention, one or more of hydrobromic acid, hydrochloric acid and hydroiodic acid are used as additives, and Br2 and the additives in the electrolyte are complexed to form Br2X <-> to exist in the electrolyte, so that battery performance reduction caused by overflow and precipitation of bromine gas in the positive electrolyte is avoided, and the efficiency of the bromine-chromium flow battery is improved; meanwhile, the flow battery system further relieves battery part aging caused by bromine overflow and capacity fading caused by bromine loss through the gas conveying device, so that the service life of the bromine-chromium flow battery is prolonged.

The invention discloses a derivatization device and a derivatization method for on-line production of a derivatization reagent, the device comprises a chemical column suppressor, a reaction reagent, a six-way valve, a derivatization reactor, a pump system and a flow path system, and the chemical column suppressor, the reaction reagent, the six-way valve and the derivatization reactor are connected through the flow path system; the six-way valve is provided with a regeneration flow path, a cleaning flow path and a generation flow path, and the three suppression columns of the chemical column suppressor are respectively connected with the regeneration flow path, the cleaning flow path and the generation flow path in turn; the three suppression columns of the chemical column suppressor respectively and sequentially displace hydrogen ions in the regeneration flow path, clean in the cleaning flow path and react in the generation flow path to generate hydriodic acid. By adopting the chemical column suppressor with the three suppression columns, derivative reagents can be continuously generated, and the generation efficiency of the derivative reagents is improved.

The invention discloses a negative electrode electrolyte and an acidic tin-bromine flow battery, and belongs to the technical field of energy storage. The negative electrode electrolyte provided by the invention comprises an active substance and a supporting electrolyte, the active substance comprises tetravalent tin salt; the tetravalent tin salt is selected from at least one of tin tetrachloride, tin sulfate, tin bromide and stannate; the supporting electrolyte is selected from at least one of sulfuric acid, hydrochloric acid, perchloric acid, methanesulfonic acid, hydrobromic acid and hydriodic acid. According to the acidic tin-bromine flow battery provided by the invention, a proper tin ion ligand is selected in the negative electrode electrolyte, and the formed tin-based complex can effectively improve the redox kinetics of Sn < 4 + > / Sn < 2 + > and improve the efficiency of the tin-bromine flow battery. Besides, the modification of the negative electrode can further improve the adsorption of reactive active substances and improve the electron transfer rate, and the high specific surface area can provide more active sites, so that the reaction polarization is reduced and the battery performance is improved.

A reactive distillation system for decomposition of hydriodic acid into hydrogen gas and iodine, with optional secondary purification unit(s) is described. Methods for using the reactive distillation system with optional secondary purification unit(s) for the decomposition of hydriodic acid into hydrogen gas and iodine is also described. When the purification unit is present, the system and methods of the disclosure can be used for the production and purification of hydrogen from hydriodic acid.

The invention belongs to the technical field of perovskite solar cell material preparation, and particularly provides a simple preparation method of high-purity formamidine hydriodate with controllable crystal form, which comprises the steps of feeding, concentrating, washing, dissolving, crystallizing, washing, drying and the like. The method can be used for synthesis in a room-temperature laboratory, has few steps, is simple to operate, and obviously reduces the difficulty in process production. The crystal is separated out by cooling instead of a poor solvent for recrystallization, and the crystal form of the product can be controlled simply by a simple programmed cooling program with high operability. And meanwhile, by adding the washing procedure, the recrystallization frequency is reduced, the use of an organic solvent is greatly reduced, the post-treatment complexity of the product is also reduced, and the phenomenon that the product is heated and exposed to light in the post-treatment process to generate impurities is effectively avoided.

The invention discloses a perovskite solar cell and a preparation method thereof. The preparation method comprises the following steps: S1, preparing an inorganic halogenated metal film on the surface of a hole transport layer of a conductive substrate; s2, coating the composite solution on the surface of an inorganic halogenated metal film through a spin-coating method, and annealing to obtain a perovskite film; the composite solution comprises an organic amine salt solution and guanidyl small molecules; the organic amine salt solution comprises at least one of formamidine hydroiodate, methylamine chloride, formamidine hydrobromide, methylamine iodide or methylamine bromide; s3, preparing an electron transport layer on the surface of the perovskite thin film; and evaporating a metal electrode on the surface of the electron transport layer to obtain the perovskite solar cell. According to the invention, the perovskite solar cell is prepared by a dry-wet two-step conversion method; the guanidyl small molecules enter the thin film through diffusion, the growth quality of the thin film is improved, and the photoelectric conversion efficiency and the open-circuit voltage of a dry-wet two-step conversion method are improved.

The invention provides a method for preparing formamidine hydriodate through a one-pot method, formamidine hydriodate and application of formamidine hydriodate, and particularly relates to the technical field of perovskite photovoltaic cell precursor material preparation. The method comprises the following steps: adding an iodine elementary substance and a solvent into a reaction container, dropwise adding a reducing agent to carry out a first reaction, adding formamidine acetate in batches to carry out a second reaction at 0-10 DEG C after the reaction is completed, and carrying out post-treatment purification after the reaction is completed to obtain the formamidine hydriodate. The method directly selects the iodine elementary substance as the raw material, so that the use cost of the raw material is effectively reduced; one-pot integrated reaction is adopted in the preparation process, intermediate separation is not needed, the opportunity that metal impurities are introduced due to multiple transfer and purification operations in a traditional method is reduced, and the content of the metal impurities in the product can be reduced; distillation and other steps with high energy consumption and long time consumption are omitted, so that the reaction period is shortened, and the energy consumption is reduced.

The invention discloses an organic-inorganic hybrid copper-based monomolecular crystal and a preparation method and application thereof, the molecular formula of the monomolecular crystal is (C9H7N) 2CuBr2, and the preparation method comprises the following steps: dissolving an organic cation source in a medium solvent to obtain an organic solution; dissolving a copper metal ligand in hydroiodic acid to obtain an acid solution; mixing the organic solution and the acid solution, putting the mixed solution into a sealed bottle filled with a diffusion solvent, sealing by a sealing cover to form a sealed system, keeping out of the light, standing after the diffusion solvent in the bottle is completely volatilized, and observing a light green needle-like crystal to obtain a finished product. Isoquinoline is selected as an organic cation source, copper bromide metal salt is selected as a metal ligand, the monomolecular crystal which is flexible in structure, small in molecular weight, high in stability and excellent in performance is prepared through an anti-solvent diffusion single crystal method, the synthesis process is simple, the preparation period is short, the yield is high, and environment friendliness is achieved; and the application of the monomolecular crystal in the field of multifunctional miniaturized circuits is widened.

The invention relates to the technical field of organic synthesis, in particular to a rapid synthesis method of a polysubstituted pyrimidine carboxylic acid compound. The rapid synthesis method of the polysubstituted pyrimidine carboxylic acid compound comprises the following steps: by taking 4, 6-dichloro-5-methoxypyrimidine as a raw material and tetrahydrofuran as a solvent, carrying out Grignard reaction to prepare an intermediate I, then carrying out Suzuki reaction to obtain an intermediate II, carrying out saponification reaction on sodium hydroxide, and then reacting with hydroiodic acid to obtain the polysubstituted pyrimidine carboxylic acid derivative. According to the rapid synthesis method of the polysubstituted pyrimidine carboxylic acid compound, the reaction only needs four steps, the conditions are mild, the atom utilization rate is high, the route is safer and more environmentally friendly, industrial production is facilitated, and the polysubstituted pyrimidine carboxylic acid compound can be used as an important pharmaceutical and chemical building block to be conveniently used for subsequent derivatization.

This invention discloses a method for preparing high-purity hydroiodic acid based on an electrodialysis system, belonging to the fields of chemical engineering and new energy technology. The method includes: introducing a first iodide solution into the material chamber of a three-compartment bipolar membrane electrodialysis system; after acid-base preparation, a second iodide solution is obtained; the obtained second iodide solution is then introduced into the desalination and concentration chambers of a two-compartment homogeneous membrane electrodialysis system for electrodialysis concentration, yielding a third and fourth iodide solution; the products from each stage can be reused or sold after processing. This invention avoids the generation of the byproduct iodate, directly generating a high-purity, high-concentration hydroiodic acid solution, eliminating cumbersome and expensive purification steps, and completely achieving product separation. The process is simple, safe, and environmentally friendly. The acid produced by the three-compartment bipolar membrane electrodialysis system becomes a qualified hydroiodic acid product after passing through an MVR evaporation system, and the produced alkali, as a byproduct, can be sold or utilized, turning waste into treasure.

The invention relates to a hydroiodic acid preparation device and method, and relates to the technical field of new energy. The hydriodic acid preparation device comprises a first phosphoric acid circulating device, a second phosphoric acid circulating device, a hydriodic acid circulating device, a deiodide ion device and a membrane module, and the membrane module comprises a first phosphoric acid chamber, a second phosphoric acid chamber and a hydriodic acid chamber which are sequentially arranged and are in fluid communication. The second phosphoric acid chamber is communicated with the iodide ion removal device, so that even if a small amount of iodide ions enter the second phosphoric acid chamber, the iodide ions can enter the iodide ion removal device along with the circulation of the liquid to be subjected to deiodination treatment, the liquid subjected to deiodination treatment returns to the membrane module again to be recycled, and at the moment, the iodide ions contained in the circulating liquid do not exceed the standard; the iodide ions in the second phosphoric acid chamber cannot migrate to the first phosphoric acid chamber, so that the anode membrane cannot be damaged due to migration of the iodide ions, the service life of the membrane module can be greatly prolonged, and the production efficiency of the membrane module can be greatly improved.

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.

A preparation method and application of a perovskite film, which are used to solve the technical problem of how to have good stability while having good photoelectric conversion efficiency for the existing perovskite film. An inorganic halide salt containing bismuth, an N,N-dimethylformamide solution, hydroiodic acid and raw materials are used to prepare an intermediate material containing bismuth. Using this intermediate material as a raw material, together with an inorganic halide salt containing lead, cesium iodide and an N,N-dimethylformamide solution as raw materials, a precursor solution is prepared. The perovskite film prepared from this precursor solution has a perovskite crystal structure of ABX3. In the perovskite film of the present invention, the A site is occupied by CS and DMA, and the B site is occupied by Pb and Bi. The perovskite film in the present invention has good stability, and at the same time, the photoelectric conversion rate can exceed 10%. At the same time, a black perovskite thin film can be obtained at a temperature of 80 to 150 °C or below. The present invention is mainly used in the technical field of optoelectronic functional materials and devices.

A liquid-liquid reactor for the production of hydriodic acid and sulfur dioxide from sulfur-containing hydrocarbons or hydrogen sulfide dissolved in liquid hydrocarbon streams, iodine and water as part of a larger process for the production of hydrogen is described. Methods and equipment for the removal of sulfur from liquid hydrocarbons and the use of an iodine chemical cycle to produce hydrogen gas from the byproducts of this purification are described.

Embodiments of the present invention disclose a synthesis method, a battery device and a solar cell of a formamidinium-based ionic liquid perovskite precursor solution, including: adding organic sodium salt and formamidinium hydrochloride into ethanol respectively, stirring and dissolving to obtain a formamidinium hydrochloride solution and a sodium alkylate solution; dropping the formamidinium hydrochloride solution into the sodium alkylate solution drop by drop, stirring the mixed solution at 25-60 °C, and reacting for 24-36 h; filtering the reacted mixed solution, taking the filtrate, and rotary evaporating the obtained primary filtrate to remove the ethanol solvent, and shaking and washing with an organic solvent for 25-35 min; performing secondary filtration on the washed solution, taking the filtrate, and rotary evaporating the obtained secondary filtrate to remove the organic solvent to obtain an organic acid formamidinium ionic liquid; dissolving lead iodide and formamidinium hydroiodide in the organic acid formamidinium ionic liquid, and reacting at 40-80 °C for at least 5 h to obtain a formamidinium-based ionic liquid perovskite precursor solution. This method solves the problem of poor phase stability of FAPbI3 perovskite in a humid environment.

The application discloses a methyl guanidine dipeptide compound and a synthesis method and application thereof, and belongs to the technical field of chemical synthesis, and the chemical structural formula of the compound is as follows: the synthesis method of the methyl guanidine dipeptide compound comprises the following steps: L-ornithine hydrochloride and 1,2-dimethyl-2-isothiourea hydroiodide are heated and reacted overnight in an alkaline solution; the pH value of the solution is adjusted to be neutral, purification is carried out, water is added for dissolution and the solution is adjusted to be acidic, ion exchange resin is passed through, and an intermediate 1 is obtained; pure water and isopropyl alcohol are added to the intermediate 1 and adjusted to be alkaline; isovaleryl chloride is added to the solution and adjusted to be alkaline, and the solution is stirred and reacted at room temperature; the solution is kept alkaline, heated to 45-55 DEG C, adjusted to be weakly acidic, cooled to 5-15 DEG C, and the precipitate is collected, so that a crude product is prepared; the crude product is dissolved in a methanol-water mixed solution, gradient elution is carried out through liquid chromatography, and drying is carried out, so that the methyl guanidine dipeptide compound is prepared. The methyl guanidine dipeptide compound synthesized by the method has high purity, the synthesis process is simple, and the operation is convenient.

The present invention discloses a thermochemical sulfur-iodine cycle hydrogen production HIx phase purification device, belonging to sulfur-iodine cycle hydrogen production equipment. The two outlets of the filter used are respectively connected to the hydroiodic acid distillation tower and the barium sulfate decomposition tower. A liquid inlet tank is installed on the outer top surface of the filter tank of the filter. The liquid inlet tank is equipped with a driving water wheel. A liquid inlet pipe is provided above one side of the driving water wheel. A rotating shaft connected to the driving water wheel is rotatably installed behind the other side. One side of the conical filter cover is provided with a strip-shaped perforation along its generatrix direction. Below the strip-shaped perforation is a material receiving trough arranged downward and capable of swinging downward. A scraper is fixed to the side of the rotating shaft. When the scraper rotates with the rotating shaft, when it approaches the strip-shaped perforation, the driving assembly drives the material receiving trough to rotate downward by an angle, so that the sediment accumulated in the material receiving trough continues to slide downward. The present invention can dynamically and continuously filter and separate the barium sulfate in the hydrogen production process.

The invention relates to a synthesis method of a perovskite microcrystalline material, and belongs to the field of perovskite materials. The invention provides a synthesis method of a perovskite microcrystalline material, which comprises the following steps: mixing alkali metal iodide salt, lead acetate trihydrate and formamidine acetate, and reacting under preset conditions to obtain the formamidine lead iodide perovskite microcrystalline material. According to the method, an acid-free system is adopted for synthesizing the formamidine lead iodide perovskite microcrystal material for the first time, hydroiodic acid which is indispensable and extremely high in danger coefficient in a traditional aqueous phase method is completely abandoned, alkali metal iodide salt is creatively adopted as a green iodine source, high-quality formamidine lead iodide perovskite microcrystals are successfully synthesized, the material performance is guaranteed, and meanwhile the yield of the formamidine lead iodide perovskite microcrystals is increased. The safety of the synthesis process is greatly improved; in addition, the solid salt with stable properties is adopted, so that the sensitivity of the whole synthesis process to air and humidity is reduced, and better repeatability and stability are achieved.

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.

This invention relates to the field of alkali metal-chlorine secondary battery technology, and discloses an electrolyte additive, an electrolyte, and an alkali metal-chlorine secondary battery. The additive contains components A, B, and C in a mass ratio of 1:0.2-2.0:0.5-3.0; component A is selected from at least one of ethyl viologen dibromide, benzyl viologen diiodide, and 1,4-phenylenediamine hydroiodate; component B is selected from at least one of 3-(4-iodophenyl)-3-(trifluoromethyl)-3H-bisacrylidine, 1-bromo-2-fluorobenzene, and 4-(benzyloxy)-1-bromo-2-fluorobenzene; and component C is selected from at least one of 3-(trifluoromethyl)phenyltrimethylammonium bromide, (3-fluoro-4-iodophenyl)methylamine, and 3-iodobenzylamine. The electrolyte provided by this invention, when applied in an alkali metal-chlorine secondary battery system, exhibits high reversible capacity, cycle stability, and environmental adaptability.

The invention discloses a catalyst separation device and separation method for a process for synthesizing acetic acid by methanol carbonyl, and belongs to the technical field of acetic acid synthesis device.The catalyst separation device comprises a spray tower, a liquid preparation tank is arranged on one side of the spray tower, and the spray tower is connected with the liquid preparation tank through a high-pressure acid-resistant pump; a collecting pipe is fixedly mounted on one side of the high-pressure acid-resistant pump, a carbon monoxide tank is arranged on the other side of the spray tower, and a supplementing assembly is arranged at the top end of the liquid preparation box. By arranging the supplementing assembly, when the liquid level of a hydroiodic acid solution in the liquid preparation box descends, a floating ball automatically detects that the content of the hydroiodic acid solution in the liquid preparation box is low, so that a ball valve is driven to be opened, the hydroiodic acid solution flows into the liquid preparation box through a supplementing pipe, the negative pressure in the high-pressure acid-resistant pump is stable, output is uniform, and the stability of a catalyst is improved; the generation of a deactivated catalyst is reduced, and the separation effect in the spray tower is improved.

Barite (barium sulfate) scale may be a problem in subterranean formations, wellbores, pipelines and other locations, and may be difficult to remove in many cases. An aqueous fluid composition effective to remove barite scale may include a concentrated mineral acid, a first salt including an iodide anion, and a second salt including an anion that forms a water-soluble barium salt. A suitable aqueous fluid composition may include concentrated hydriodic acid, an alkali metal iodide, and an alkali metal hypophosphite. The aqueous fluid composition may be used in combination with a second treatment stage comprising a fluid composition comprising at least one acid gas trapping agent. The at least one acid gas trapping agent may comprise a first component reactive to hydrogen sulfide and optionally a second component reactive to carbon dioxide.

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 invention relates to the technical field of novel sensing materials, in particular to an rGO / Zr-MOF composite sensing material for noise, a preparation method of the rGO / Zr-MOF composite sensing material and application of the rGO / Zr-MOF composite sensing material to a noise sensor. The preparation method comprises the following steps: S1, ultrasonically dispersing graphene oxide GO in ethanol, then adding hydriodic acid, carrying out an oil bath reaction, removing iodine, centrifuging to obtain a solid product, centrifugally washing, and drying the solid product to obtain rGO; s2, zirconium salt is dissolved in N, N-dimethylformamide, an organic ligand 4, 4 '-stilbene dicarboxylic acid is added, then the rGO prepared in the S1 is added, ultrasonic dispersion is conducted, and then an oil bath reaction is conducted; and S3, carrying out centrifugal washing on the reaction liquid obtained in S2 to remove supernate, so as to obtain the rGO / Zr-MOF composite sensing material. The rGO / Zr-MOF composite sensing material prepared by the invention is used as a sensing element, and can efficiently receive noise and convert the noise into measurable electric signals.

The invention provides an organic-inorganic hybrid perovskite nanowire material, a preparation method thereof and a gas sensor, and relates to the technical field of semiconductor materials and devices. The preparation method comprises the following steps: mixing lead iodide, methylamine hydriodic acid / cesium iodide and phenylethylamine hydriodic acid / butylammonium iodide in a set molar ratio according to the metering number in the general formula of the organic-inorganic hybrid perovskite, and adding a perovskite benign solvent to obtain an organic-inorganic hybrid perovskite precursor solution; and dripping the organic-inorganic hybrid perovskite precursor solution on a substrate, exposing the organic-inorganic hybrid perovskite precursor solution in an anti-solvent atmosphere, and crystallizing to obtain the organic-inorganic hybrid perovskite nanowire material. The organic-inorganic hybrid perovskite nanowire material with a three-dimensional network structure is prepared by controlling the concentration of the perovskite precursor solution and the experimental temperature based on raw materials in a molar ratio required by a quasi-two-dimensional perovskite crystal, and the obtained product has a higher specific surface area.

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 discloses a method for regulating wide-band gap perovskite crystallization through CsPb2Br5 and laminated photovoltaic application thereof, and particularly relates to the field of photoelectric materials and devices. Comprising the following steps: preparing a CsPb2Br5 nanosheet; the preparation method comprises the following steps: dissolving cesium iodide, formamidine hydriodate, lead iodide, lead bromide and CsPb2Br5 nanosheets in a solvent to obtain a perovskite precursor solution; wherein the perovskite precursor solution comprises two phases, namely a Cs0.2 FA < 0.8 > PbI < 1.8 > Br < 1.2 > perovskite precursor complex and a CsPb2Br < 5 >; and preparing the perovskite precursor solution into a perovskite thin film of the solar cell to obtain the solar cell. The crystal can be guided to uniformly grow along the vertical direction, the crystal boundary and defects are reduced, the crystal structure is optimized, and the stability and uniformity of the film are enhanced; and photo-induced halogen phase separation and defect formation can be inhibited, so that the photoelectric property and long-term stability of the perovskite thin film are improved.