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

The invention relates to a chemical method for in-situ large-area controlled synthesis of a perovskite type CH3NH3PBI3 membrane material based on a lead simple-substance membrane. The method comprises: sputtering the lead simple-substance membrane on the surface of a substrate, then horizontally immersing the substrate material possessing the lead simple-substance membrane in an organic solution containing a simple substance iodine and iodinated methylamine, and performing a constant-temperature reaction to prepare a CH3NH3PBI3 membrane material in situ; or putting the substrate possessing the lead simple-substance membrane in a steam atmosphere of a simple substance iodine to perform iodination to generate a lead iodide membrane, then immersing in an organic solution containing iodinated methylamine, and performing a constant-temperature reaction to prepare the CH3NH3PBI3 membrane material in situ. The method is simple in operation, low in energy consumption and low in cost, and has wide industrial application prospect. The obtained CH3NH3PBI3 membrane is high in purity, uniform in membrane-surface crystal and excellent in crystallinity.

This invention discloses method and equipment for preparing lead iodide single crystals from lead iodide melt, which comprises the steps of: cleaning an ampule, filling it with lead iodide powders, degassing and sealing the ampule, growing the single crystals and cooling. The method can effectively suppress the decomposition of lead iodide melt and the vaporization of iodine, and can remove segregated lead. The ampule is made of a quartz tube, and comprises a seed crystal bag, a growth chamber, a connecting vessel, a lead tube, a loading bag anb a hook. After filling, the ampule is placed into a two-stage temperature range vertical tubular furnace to finish the growth of the single crystals. The as-grown single crystals are orange and semi-transparent with sizes up to Phi (15-20)X30 mm. The electrical resistivity of as-grown single crystals can reach 1012-1013 ohm .cm, thus the single crystals have wide applications, especially as room temperature nuclear radiation detector.

The invention relates to the field of materials physics and chemistry, in particular to a method and system for growing lead iodide single crystals, which are capable of steadily obtaining lead iodide single crystals with high purity and accordance of stoichiometry. The method comprises the following steps of placing lead iodide seed crystals, melting lead iodide precasting ingots, crystallizing, and placing the lead iodide seed crystals on the lead iodide precasting ingots in a contact way, wherein the atom mole ratio of lead and iodic in the lead iodide seed crystals and the lead iodide precasting ingots is 1:1.95 to 1:2.05; during melting and crystallizing, the lead iodide seed crystals are kept in solid state, the lead iodide precasting ingots are heated from top to bottom in sequence in the vertical direction so as to be melted into liquid lead iodide from top to bottom in sequence, and the liquid lead iodide is enabled to crystallize during the melting and crystallizing; the temperature of the liquid lead iodide is 410-450 DEG C, and the temperature gradient of the crystallization interfaces between the liquid lead iodide and the lead iodide single crystals or between the liquid lead iodide and crystallized solid liquid lead is enabled to be 5-30 DEG C/cm.

The invention provides a method for preparing an NH4PbIxCl3-x perovskite photoelectric material by grinding. The method comprises the following steps of: (1) mixing ammonium chloride and lead iodide,and putting the mixture into a ball mill for fully grinding; wherein the molar ratio of the ammonium chloride to the lead iodide is 1:1-3:1, the grinding time of the ball mill is 1-2h, the grinding rotating speed of the ball mill is 200-400 revolutions per minute, and the mass ratio of materials in the ball mill to grinding balls is 1:20-1:10; and (2) putting the mixture fully ground in the step (1) into a vacuum drying oven for heating, and performing cooling to room temperature to obtain the NH4PbIxCl3-x perovskite photoelectric material. The preparation process is simple and easy to control, the preparation cost is low, and the NH4PbIxCl3-x perovskite photoelectric material obtained by the method has a proper band gap and is expected to be applied to photovoltaic cells.

The invention discloses a preparation method of an organic-inorganic hybrid perovskite thin film. Conductive glass is used as a substrate; a lead sulfide thin film is prepared by adopting an electro-deposition method; the lead sulfide thin film is used as a precursor; an iodine elementary substance is used as an iodizating agent for iodizating lead sulfide into lead iodide; and then the lead iodide reacts with methyl ammonium halide to obtain the perovskite thin film. The method disclosed by the invention can be operated in a large area; a film layer is controllable in area and shape, and an electro-deposition area and shape can be controlled by a method of corroding a conducting plane; a thickness of the film layer is controlled, and the thickness of the film layer can be conveniently controlled by regulating electro-deposition time; chemical components of the film layer are controllable, and the film layers with different components can be obtained by changing a ratio of I to Br in CH3NH3X solution, so that the perovskite thin films with different physical properties are obtained; and the obtained film layer is relatively uniform and has good compactness.

The invention relates to a method for improving the stability of red fluorescence organic-inorganic hybrid perovskite structure MAPbI3 quantum dots, and belongs to the field of nano-material science.The stable and efficient organic-inorganic hybrid perovskite structure MAPbI3 quantum dots are synthesized in one step through a coprecipitation process at room temperature by using methylammonium iodide (CH3NH3I3) and lead iodide (PbI2) as raw materials, oleic acid and oleylamine as ligands and europium iodide (EuI2) and manganese iodide (MnI2) as dopants. Codoping with manganese and europium ions improves the stability of the quantum dots and ensures the high fluorescence quantum efficiency of the quantum dots; and undoped quantum dots are almost completely quenched after standing for about33 h, but the fluorescence efficiency of the Eu<2+> and Mn<2+> codoped perovskite quantum dots is still 65%, so the stability is greatly improved.

The invention relates to a CsPbI3 mixed-phase perovskite thin film and a controllable preparation method thereof. The controllable preparation method comprises the following operation steps that 1, adding octadecene, oleylamine, oleic acid and lead iodide into a three-neck flask, heating and stirring at the temperature of 140-180 DEG C under the vacuum condition to serve as a reaction solvent; 2,dissolving cesium stearate and oleic acid in octadecene to form a precursor solution; and 3, rapidly injecting the precursor solution into a reaction solvent, rapidly cooling with water, and then centrifugally purifying to obtain the perovskite CsPbI3 quantum dot; and 4, spin-coating a dispersion liquid of the CsPbI3 quantum dots on the surface of a clean glass sheet, and carrying out heat treatment in an atmospheric environment to obtain the CsPbI3 mixed-phase perovskite thin film. The CsPbI3 mixed-phase perovskite thin film is prepared by the method disclosed by the invention. According to the invention, CsPbI3 is used for obtaining a monomer to emit white light, and the material is novel; based on a full-inorganic perovskite material, the perovskite material is more stable than a traditional perovskite material; phase regulation of CsPbI3 is achieved through the temperature and time of heat treatment, and the method is simple and easy to implement.

The invention discloses a perovskite solution with a controllable and adjustable operation time window, a cell, a preparation method and application, and belongs to the field of perovskite solar cells. The perovskite solution comprises perovskite ABX3, an acetonitrile solvent and a coordination type solvent, A site is a methylamine ion, B site is a lead ion, X site is a halide ion, and the coordination type solvent is selected from dimethyl sulfoxide, N-methyl pyrrolidone and 4-tert-butylpyridine. The preparation method comprises the following steps: placing perovskite single crystals or iodine methylamine and lead iodide powder prepared by stoichiometric ratio in a methylamine atmosphere to obtain a yellow perovskite precursor solution, or dissolving the perovskite single crystals or iodine methylamine and lead iodide powder prepared by stoichiometric ratio in a methylamine ethanol solution to obtain a viscous yellow perovskite precursor solution, and then, uniformly mixing the coordination solvent and acetonitrile to obtain the perovskite ink. The invention also provides the perovskite cell, the preparation method and the application. The ink disclosed by the invention can realize adjustment of a processing time window and is extremely high in industrial applicability.

The invention belongs to the technical field of waste recovery, and particularly relates to a recovery method of a waste lead-acid battery. The recovery method comprises the following steps of, firstly, converting lead elements in lead paste of a waste lead-acid battery into lead sulfate through a wet process; then desulfurizing the obtained lead sulfate and converting the desulfurized lead sulfate into an aqueous solution of divalent lead ions; and finally, mixing and reacting the obtained aqueous solution of divalent lead ions with a potassium iodide solution under an acidic condition to prepare the lead iodide. According to the recovery method, lead iodide is prepared from a main source of secondary lead of a waste lead-acid battery through a wet process which is almost pollution-free and mild in reaction conditions, so that the problems that pollution can occur in the traditional lead iodide preparation process and lead resources of the waste lead-acid battery are recycled are solved.

A method for increasing the speed of aerosol jet assisted printing a layered perovskite structure comprises applying a PEDOT:PSS layer to a substrate; applying an aerosol mist containing methylammonium iodide and lead iodide, with or without additives, atop the PEDOT:PSS layer with an aerosol jet nozzle; and holding the structure to form a methylammonium lead iodide (CH₃NH₃PbI₃) perovskite thin film layer. The substrate may be an ITO glass or plastic substrate, and the PEDOT:PSS layer may be applied by a process selected from spin-coating, inkjet-printing, slot-die-coating, aerosol jet printing, physical vapor deposition, chemical vapor deposition, and electrochemical deposition. The aerosol mist is generated from a single ink comprising all the constituents of methylammonium lead iodide either dissolved or suspended in one or more compatible solvents or co-solvents. The holding of the CH₃NH₃PbI₃ layer may be performed at about 25-120° C. or lower for 96 hours or less.

The invention discloses a method for dissolving and extracting lead iodide by using a polyethylene glycol type eutectic solvent. The method comprises the following steps: 1) stirring and mixing polyethylene glycol 200 and a hydrogen bond donor according to a molar ratio to form the polyethylene glycol type eutectic solvent; 2) weighing a part of the eutectic solvent prepared in the step 1), addinga hybrid perovskite solar cell component containing lead iodide, and continuously stirring for a period of time until the eutectic solvent of the hybrid perovskite solar cell component containing lead iodide is saturated; 3) carrying out centrifugation on the eutectic solvent prepared in the step 2); and 4) taking a part of supernatant of the eutectic solvent of the centrifuged hybrid perovskitesolar cell component containing lead iodide, and detecting the concentration of lead iodide by adopting an ultraviolet-visible absorption spectrometer and taking dimethyl formamide as a background. The method has the advantages that the defects in the prior art can be overcome, and the method is simple, easy to operate, cheap in raw materials and environmentally friendly.

The invention provides an organic and inorganic hybridized lead iodide visible light catalysis material. The molecular formula of the material is [Fe(2.2-bipy)3]2Pb8l21, Fe(SO4) 7H2O, 2,2-dipyridyl, Pbl2 and Kl are adopted and added into a mixed solution of 0.5-1 mL of Hl, 4-5 mL of N.N-dimethyl formamide and 1-2 mL of H2O according to the molar ratio being (2-2.5):(6-6.5):(8-8.5):(2-2.5), and themixture is put into a reaction kettle to be sealed; the sealed reaction kettle is placed into a drying box and heated to 140 DEG C through 5 h, then, a constant temperature reaction is performed under the temperature of 140-160 DEG C for 6-8 h, the temperature is lowered to the room temperature, and suction filtration, washing and airing are performed to obtain the material. A transition metal compound is introduced as a positive ion and a template agent for the first time, the organic and inorganic hybridized lead iodide compound is synthesized, the compound can effectively absorb visible light in sunlight, the material has the efficient and stable visible light catalysis performance, and rhodamine B and other organic contaminants can be decomposed under the visible light irradiation effect.

The invention discloses a method for preparing and transferring ultra-thin and large-sized lead iodide nanosheets. The method comprises uniformly mixing pure lead iodide powder and ultrapure water according to a certain proportion, heating and stirring at a certain temperature, and then using The solution method is to drop a certain volume of solution on a substrate with a metal coating on the surface at a certain temperature to prepare ultra-thin lead iodide nanosheets; use the characteristics of growing lead iodide nanosheets on the liquid surface to drain or orient them Transfer to the target substrate or sample, non-destructive ultra-clean transfer of ultra-thin large-sized lead iodide nanosheets can be achieved. The invention can prepare and transfer ultra-thin and large-size lead iodide nanosheets with a size of 50-200um, a thickness of 3-20nm, a single crystal structure and high quality, and has important reference significance for growing more nanosheets based on solution method. Physical mechanisms such as molecular dynamics can be further studied, and the transfer method provided by the present invention has the advantages of non-destructive ultra-cleaning, good controllability, high repeatability, high yield, low cost, etc., and is beneficial to industrial production.