24 results about "Formamidinium" patented technology

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.

This invention relates to a novel and improved method for preparing substituted N-(2-chloroethyl)-N'-hydroxy-3-phenoxypyridazine-3-formamidinium, which can be converted into substituted 3-(3-phenoxypyridazine-4-yl)-5,6-dihydro-4H-1,2,4-oxadiazine. Specifically, this invention relates to the preparation of 3-(3-chloro-2-fluoro-phenoxy)-N-[1-(chloromethyl)-2-(2-chloro-4-methyl-phenyl)ethyl]-N'-hydroxy-6-methylpyridazine-4-formamidinium, which can be converted into 3-[3-(3-chloro-2-fluorophenoxy)-6-methylpyridazine-4-yl]-5-(2-chloro-4-methylbenzyl)-5,6-dihydro-4H-1,2,4-oxadiazine; More specifically, it involves 3-(3-chloro-2-fluoro-phenoxy)-N-[1-(chloromethyl)-2-(2-chloro-4-methyl-phenyl)ethyl]-N'-hydroxy-6-methyl-pyridazin-4-formamidinium, which can be converted into (5S)-3-[3-(3-chloro-2-fluorophenoxy)-6-methylpyridazin-4-yl]-5-(2-chloro-4-methylbenzyl)-5,6-dihydro-4H-1,2,4-oxadiazine.

This invention belongs to the technical field of solar cells and discloses a three-dimensional two-dimensional core-shell self-encapsulated inverted perovskite solar cell and its preparation method. The method involves preparing an inverted planar heterojunction perovskite solar cell using NiO nanocrystals with a particle size of 3-5 nm and SnO2 nanorods with a particle size of 2-4 nm and an aspect ratio of 3-5, respectively, forming a hole transport layer (15-25 nm) and an electron transport layer (15-30 nm). A pyridylamine derivative hydrohalate is attached as a ligand to the surface of the NiO nanocrystals and SnO2 nanorods and added to the PbI2 layer. During the two-step preparation of the three-dimensional perovskite light-absorbing layer (500-800 nm) of formamidine triiodide(II)ate (FAPbI3), two-dimensional perovskites are simultaneously generated at the FAPbI3 / hole transport layer interface, the FAPbI3 / electron transport layer interface, and the grain boundaries within the FAPbI3 layer, thus forming a three-dimensional two-dimensional core-shell self-encapsulated perovskite light-absorbing layer. Finally, an aluminum-doped zinc oxide (AZO) top electrode was sputtered onto the electron transport layer to obtain a three-dimensional two-dimensional core-shell self-encapsulated inverted perovskite solar cell.

This invention discloses a perovskite active layer passivating agent, a perovskite solar cell, and a preparation method thereof, relating to the field of perovskite solar cell technology. The invention uses a combination of formamidine thiocyanate (FASCN) and dodecyl ammonium bromide (DABr) as passivating agents. Through the "phase screening" effect of FA⁺ and the coordination regulation of SCN⁻, n=3 single-phase quasi-two-dimensional perovskite is selectively generated on the wide-bandgap perovskite surface, completely suppressing the n=2 phase and eliminating multiphase energy level disorder. Simultaneously, it achieves triple synergistic passivation: SCN⁻ coordinates and passivates lead defects, Br⁻ fills halogen vacancies, and FA⁺ occupies A-site vacancies, resulting in a 27% reduction in trap density and a 12-fold increase in carrier lifetime. The resulting perovskite solar cell exhibits a 6.8% increase in efficiency, significantly enhanced thermal stability, and a 4-fold increase in T80 lifetime. Furthermore, it is fully compatible with existing preparation processes and suitable for large-scale production.

This invention belongs to the field of polymer materials and relates to a method for preparing a multifunctional emulsion antioxidant and its application, specifically to an emulsion antioxidant that also absorbs ultraviolet light and its application. A multifunctional emulsion-type antioxidant comprises the following components: a phenolic primary antioxidant, wherein the phenolic primary antioxidant comprises a mixture of p-cresol and dicyclopentadiene copolymer (TH-CPL) and triethylene glycol bis[β-(3-tert-butyl-4-hydroxy-5-methylphenyl)propionate] (antioxidant 245); a thioester secondary antioxidant; a UV absorber; a light stabilizer; a nonionic surfactant; and deionized water; wherein the UV absorber is N-(ethoxycarbonylphenyl)-N'-methyl-N'-phenylformamidinium (UV-1), and the light stabilizer is a mixture of bis(1,2,2,6,6-pentamethyl-4-piperidine) sebacate and 1-methyl-8-(1,2,2,6,6-pentamethyl-4-piperidine) sebacate (292).

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 application belongs to the field of vixepiromide synthesis, and particularly relates to a preparation method of vixepiromide and intermediate products thereof. The preparation method of vixepiromide comprises the following steps: (1) reacting aminopropandinitrile with methyl chloroformate to generate an intermediate product one; (2) ring closing the intermediate product one with formamidine under alkaline conditions to generate an intermediate product two; (3) performing bromination on the intermediate product two with N-bromosuccinimide to generate an intermediate product three; (4) reacting the intermediate product three with pinacol diboron under the action of a catalyst to generate an intermediate product four; and (5) reacting the intermediate product four with 5-fluoro-1-(2-fluorobenzyl)-3-iodo-1H-pyrazolo[3,4-b]pyridine to generate vixepiromide. The application has the advantages of simple operation, low cost and safe production. The application further provides the intermediate products generated in the above preparation method.

This invention provides an in-situ passivation method for perovskite thin films, a perovskite solar cell, and a method for preparing the same. The in-situ passivation method includes: preparing a perovskite precursor solution comprising formamidinium cations, divalent metal cations, halide anions, and fluorobenzylamine, wherein the content of fluorobenzylamine is 0.01% to 1% of the molar amount of formamidinium cations; coating the perovskite precursor solution and annealing it to crystallize the solution and allow the fluorobenzylamine and formamidinium cations to react in situ, forming an in-situ passivated perovskite thin film. In this application, fluorobenzylamine is used to in-situ passivate the formamidinium-containing perovskite system, achieving mutual promotion between the passivation and crystallization adjustment processes. Furthermore, in-situ passivation suppresses ion migration, allowing the high-quality thin film structure composed of large grains to be maintained during long-term operation, ultimately achieving high device stability.

Disclosed is a method for manufacturing formamidine for perovskite materials for atomic layer deposition (ALD). The method for manufacturing formamidine according to the present invention comprises the steps of: (a) maintaining the temperature of a reactor at or below 20°C; (b) introducing a formamidine-acid compound, a basic compound, and water into the reactor; and (c) maintaining the temperature of the reactor at 60-70°C, and then raising the temperature to 70-80°C to manufacture the formamidine.

The application relates to a preparation method and application of a formamidinium calcium perovskite photoelectric film, and the preparation method comprises the following steps: preparing a lead iodide solution containing a sacrificing agent, and coating to form a film; then, a formamidinium hydroiodide solution is coated on the film to obtain an intermediate phase film, and the formamidinium calcium perovskite photoelectric film is prepared through annealing; or, a lead iodide solution containing formamidinium hydroiodide and a sacrificing agent is prepared, and the solution is coated to form a film, and the formamidinium calcium perovskite photoelectric film is prepared through annealing; wherein the sacrificing agent is at least one of dimethylamine hydrochloride, dimethylamine hydroiodide, N-methylethylamine hydrochloride, N-methylethylamine hydroiodide, diethylamine hydrochloride or diethylamine hydroiodide. Compared with the prior art, the sacrificing agent is mixed with a perovskite precursor solution in the application, high-quality formamidinium calcium perovskite photoelectric films are obtained through annealing, the sacrificing agent used can be completely volatilized in the process of forming the perovskite film, narrow-band-gap pure formamidinium calcium perovskite films are obtained, and the problem of phase separation is solved.

The application discloses a preparation method of an organic-inorganic hybrid perovskite quantum dot, and comprises the following steps: first, preparing a precursor solution I containing an A unit, wherein the A unit is selected from formamidinium, methylamine and phenethylamine; second, preparing a precursor solution II containing an X element, wherein the X element is selected from I, Br, Cl, SCN and CN; third, adding a compound containing a B metal element into the precursor solution I for mixing, wherein the B metal element is selected from lead, tin, manganese, indium and bismuth; and fourth, adding the precursor solution II for reaction. According to the application, a diffusion-controlled reaction system is constructed by selecting a metal cation source with low solubility in the reaction system, so that the reaction kinetics is significantly slowed down, the reaction window is prolonged, the reaction is kept in a size focusing stage, the problem that nucleation and growth are too fast to be controlled due to the ion characteristics of the perovskite quantum dot is effectively solved, and the organic-inorganic hybrid perovskite quantum dot with high single size dispersity and a near-hundred fluorescence quantum yield can be prepared in batches.

This application belongs to the field of photodetector technology, and relates to composite thin films and their preparation methods, preparation methods of A4BX6 crystals, and photodetectors. The composite thin film includes a first film layer and a second film layer. The material of the first film layer includes ABX3, and the material of the second film layer includes A4BX6; wherein A is selected from at least one of cesium ions, formamidinium ions, methylammonium ions, n-octylammonium ions, phenylethylammonium ions, benzylammonium ions, and tert-butylammonium ions; B is selected from at least one of lead ions and tin ions; and X is selected from at least one of iodide ions, bromide ions, and chloride ions. The composite thin film provided by this application simultaneously possesses high electron transport efficiency and high ultraviolet light sensitivity.

This application relates to photovoltaic devices, their fabrication methods, electrical devices, and power generation devices. The photovoltaic device includes a perovskite layer comprising a perovskite material; the thickness of the perovskite layer is denoted as H0; the thickness direction of the perovskite layer is denoted as the Z-direction; the perovskite layer has a first surface and a second surface opposite to each other in the Z-direction, the second surface being located on the light-incident side of the perovskite layer; the perovskite layer has a first region near the first surface and a second region near the second surface, the first region being located between the first surface and the second region; the perovskite material includes formamidinium ions; the concentration ratio R of the formamidinium ions in the second region and the first region is... FA Satisfying 0.7≤R FA <1. This photovoltaic device has improved photoelectric conversion efficiency.

The application belongs to the technical field of solar cells, and discloses a perovskite solar cell, a preparation method and application thereof. The perovskite solar cell comprises, from bottom to top, a flexible conductive substrate, a hole transport layer, a perovskite active layer, a passivation layer, an electron transport layer and a metal electrode layer. The perovskite active layer comprises APbX3. A comprises at least one of formamidinium ion, methylamine ion, cesium ion and potassium ion. X comprises at least one of chloride ion, bromide ion and iodide ion. The passivation layer comprises 2-ethyl-2-phenyl malonic acid diethyl ester. The solar cell has excellent photoelectric conversion efficiency and long-term stability, and can be used to prepare photovoltaic modules and electronic devices. In addition, the preparation method is simple and easy to implement, does not require complex equipment and processes, can effectively control the thickness of each layer, is used to prepare large-area high-performance perovskite solar cells, and meets the needs of industrial production.

The application discloses a perovskite solar cell containing a double-layer trifluoroacetate modification layer and a preparation method thereof. The perovskite solar cell comprises, from bottom to top, a conductive glass, an electron transport layer, an electron transport layer modification layer, a perovskite layer, a perovskite modification layer, a hole transport layer and an electrode; the electron transport layer modification layer and the perovskite modification layer are one of methylamine trifluoroacetate, formamidine trifluoroacetate, dimethylamine trifluoroacetate, ethylamidine trifluoroacetate, ethylenediamine trifluoroacetate and guanidine trifluoroacetate. The application simultaneously fills and modifies defects of the electron transport layer and the perovskite layer, passivates oxygen defects in the tin oxide and ion vacancies in the perovskite layer through hydrogen bonds and chemical interactions, and solves the problems of the perovskite solar cell, such as many defects in the electron transport layer and the perovskite layer, low efficiency and poor stability.

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 disclosure relates to a crystalline form of a substituted tetrahydrofuran compound and a preparation method thereof. Specifically, the present disclosure provides a crystal form C, a crystal form D and a crystal form H of (2R, 3S, 4S, 5R)-3-(3,4-difluoro-2-methoxyphenyl)-N-(2-((Z)-(N'-methoxyformamidino)pyridin-4-yl)-4,5-dimethyl-5-(trifluoromethyl)tetrahydrofuran-2-formamide, which has good stability and can be better used for clinical treatment.

This invention provides an in-situ passivation method for perovskite thin films, a perovskite solar cell, and a method for preparing the same. The in-situ passivation method includes: preparing a perovskite precursor solution comprising formamidinium cations, divalent metal cations, halide anions, and fluorobenzylamine, wherein the content of fluorobenzylamine is 0.01% to 1% of the molar amount of formamidinium cations; coating the perovskite precursor solution and annealing it to crystallize the solution and allow the fluorobenzylamine and formamidinium cations to react in situ, forming an in-situ passivated perovskite thin film. In this application, fluorobenzylamine is used to in-situ passivate the formamidinium-containing perovskite system, achieving mutual promotion between the passivation and crystallization adjustment processes. Furthermore, in-situ passivation suppresses ion migration, allowing the high-quality thin film structure composed of large grains to be maintained during long-term operation, ultimately achieving high device stability.

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.

This invention discloses a centimeter-scale and thermodynamically stable FAPbI3 single crystal, its preparation method, and a pre-derivatization method for molecular-level recognition of the chemical environment of the mother liquor solution. The preparation method includes: uniformly mixing formamidinium hydroiodate, lead iodide, and a single solvent containing a macrocyclic lactone structure compound to form a precursor liquid; forming crystal nuclei in the precursor liquid at a first temperature, and uniformly heating to a second temperature to maintain the cyclic structure of the macrocyclic lactone compound, resulting in centimeter-scale FAPbI3 single crystals; and isothermal treatment at the second temperature to promote ring-opening of the macrocyclic lactone compound to generate long-chain hydroxy acid molecules, resulting in centimeter-scale and stable FAPbI3 single crystals. This invention also provides a pre-derivatization method, using boron trifluoride methanol to perform methyl esterification derivatization on the target molecule, or silanized acetamide derivatization on the target molecule, followed by gas chromatography-mass spectrometry analysis, thereby achieving non-destructive recognition of the target molecule in the mother liquor solution chemistry.

The application belongs to the technical field of new energy and photocatalysis, and particularly relates to a Pt / FAPbBr3 photocatalytic material exposing (100) and (111) crystal faces, and a preparation method and application thereof, and comprises the following steps: reacting formamidinium acetate with HBr to obtain FABr, then adding EDTA-4Na, FABr and PbBr2 into an HBr solution to obtain FAPbBr3 exposing (100) and (111) crystal faces, and finally adding H2PtCl6.6H2O to perform photoreduction to obtain the Pt / FAPbBr3 photocatalytic material exposing (100) and (111) crystal faces. The application realizes the preferential exposure of (100) and (111) crystal faces by regulating the crystal face growth through EDTA-4Na, and improves the carrier separation efficiency by combining with Pt loading, and can be used for photocatalytic decomposition of HBr to produce hydrogen coupled with acetaldehyde oxidation to produce acetic acid, the hydrogen production rate reaches 1033.13 μmol·h ‑ ¹, the apparent quantum efficiency reaches 31.78%, has good stability, and has wide application prospect.

This invention relates to the field of perovskite solar cells, specifically a method for preparing high-purity formamidinium hydroiodate, comprising the following steps: dissolving formamidinium acetate in hydroiodic acid solution and stirring to obtain a precursor solution of formamidinium hydroiodate; heating the solution in an oil bath to obtain a crude product of formamidinium hydroiodate; cooling the product and adding an ethanol solution, then heating again until completely dissolved to obtain a hot saturated solution; removing the hot solution and vacuum filtering, and pouring the resulting mother liquor into a crystallizing dish for crystallization; after crystallization, adding diethyl ether for washing; placing the washed flaky crystals in an oil bath and adding ethanol again for heating to dissolve, then filtering, and pouring the resulting mother liquor back into a crystallizing dish for low-temperature crystallization; repeating the above steps three times; and vacuum drying the obtained product to obtain formamidinium hydroiodate, which is the target product. The formamidinium hydroiodate of this invention, when applied to a perovskite layer, can greatly improve the photovoltaic performance of perovskite solar cells and significantly improve the stability of the device.

The present disclosure relates to a crystalline form of a substituted tetrahydrofuran compound and a preparation method thereof. Specifically, the present disclosure provides a crystal form A and a crystal form B of (2R, 3S, 4S, 5R)-3-(3, 4-difluoro-2-methoxyphenyl)-N-(2-((Z)-(N'-methoxyformamidino)pyridin-4-yl)-4, 5-dimethyl-5-(trifluoromethyl)tetrahydrofuran-2-formamide, which has good stability and can be better used for clinical treatment.

The application discloses additive-assisted aqueous synthesis of multi-cation perovskite delta-FA x M 1‑x PbI3 solid solution and method, belong to organic-inorganic hybrid perovskite raw material synthesis field.Its chemical formula is FA x M 1‑x PbI3 (0≤x≤1), wherein, FA is formamidinium cation, M is methylamine, Rb + , Cs + Various types of organic-inorganic cations, additives are 2,3,5,6-tetrafluoro-p-phenylenedicyanide, aqueous environment is provided by hydroiodic acid aqueous solution.The application effectively inhibits the damage of water to perovskite structure through the ingenious selection of additives, controls the occupation and distribution of different cations in the crystal structure, and successfully solves the technical problems of unstable product, impure phase, uneven cation distribution and the like in aqueous synthesis.The method has the advantages of simple process, green environmental protection, low cost, easy to scale production and the like, and the prepared solid solution is conducive to realizing low-cost application of the whole perovskite market.