27results about "Lead halides" patented technology

The invention provides a molybdenum disulfide / perovskite heterojunction composite material and a preparation method and application thereof. The composite material is formed by growing mixed powder of lead halide and cesium halide on the surface of a molybdenum disulfide material. Comprising the following steps: (a) fully mixing lead halide and cesium halide powder according to a certain proportion, and placing the mixture in a crucible; (b) putting the crucible in which the mixed powder is placed into a tubular furnace, putting a molybdenum disulfide substrate above the crucible by 10cm, and pumping out air in the tubular furnace; (c) setting a tube furnace program, and heating and preserving heat at a certain speed and for a certain time; after the procedure is finished, the temperature of the tubular furnace is reduced to the room temperature, and the heterojunction composite material is obtained. The size of the composite material can reach a wafer level (2 inches), and the composite material has excellent photoelectric properties and has wide application prospects in photoelectric detectors with photoconductive structures.

To provide a method for industrially advantageously producing lead iodide of high purity and low water content in good yield.SOLUTION: The method for producing lead iodide includes a step of bringing lead oxide into contact with hydroiodic acid.SELECTED DRAWING: None

This invention discloses a ligand-assisted redeposition method for preparing lead halide perovskite nanocrystals. The preparation includes the following steps: (1) Weighing powders in sequence according to the following mass values: 0.147 g lead bromide, 0.085 g cesium bromide, and 0.09 g zinc bromide; (2) Placing the raw materials into a glass bottle containing solution A and stirring magnetically for 0.5 h, then adding the mixed solution into the glass bottle and stirring magnetically for 0.5 h until the solution is clear and transparent; (3) At room temperature, adding the precursor solution to a vigorously stirred antisolvent and stirring for 1 min to obtain a crude solution of lead halide perovskite nanocrystals, which is then centrifuged and purified to obtain the lead halide perovskite nanocrystal solution. The new preparation method of lead halide perovskite nanocrystals provided by this invention proposes a new preparation method of lead halide perovskite nanocrystals by changing the type of antisolvent and adding zinc bromide, and simplifies the purification steps and optimizes the luminescence properties of inorganic lead halide perovskite materials. The preparation method of the present invention has the advantages of low cost, simple operation and rapid preparation; the method of the present invention can prepare inorganic lead halide perovskite nanocrystal materials with adjustable luminescence range, good photoluminescence performance and high 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.

A method of forming a halide perovskite nanocrystal array having a plurality of halide perovskite nanocrystals arranged in a pattern can include coating an array of pens with a first ink comprising at least one first perovskite precursor having the formula AX and at least one second perovskite precursor having the formula BX′2 dissolved in a solvent. A is a cation, B is a metal, and X and X′ are each a halogen. The method further includes contacting a substrate with the coated pen array to thereby deposit the first ink indias a pattern of printed indicia on the substrate. The printed indicia form nanoreactors on the substrate and a halide perovskite nanocrystal nucleates and grows within each nanoreactor to form the halide perovskite nanocrystal array.

The present invention provides a means for manufacturing a perovskite solar cell having high conversion efficiency and high durability. [Solution] One aspect of the present invention relates to a method for manufacturing a perovskite solar cell, comprising a coating step of coating a carrier transport layer with a precursor solution containing a precursor material for generating perovskite crystals, an additive represented by formula (I), and a solvent, and a heating step of heating the precursor layer obtained in the coating step to form a photoelectric conversion layer containing a perovskite film. Another aspect of the present invention relates to a perovskite solar cell. TIFF2026075720000004.tif27160

To provide a nano material which can efficiently take out a hot carrier at high speed, and a method for producing the same.SOLUTION: A nano material is acquired by mixing a fullerene derivative having a carboxy group (-COOH) as a chemical anchor group with a quantum dot organic solution where a quantum dot of metal halide perovskite is dispersed, and substituting an oleic acid ligand bonded to the quantum dot with an electronegative fullerene derivative ligand obtained by removing a hydrogen ion from the carboxy group. The nano material has a quantum dot of metal halide perovskite represented by general formula ABX3(A=Cs, FA, MA, B=Pb2+, Sn2+, X=I-, Br- and Cl-), and an electronegative fullerene derivative ligand bonded to the quantum dot.SELECTED DRAWING: Figure 3

A method for preparing photoactive perovskite materials. The method comprises the steps of: introducing a lead halide and a first solvent to a first vessel and contacting the lead halide with the first solvent to dissolve the lead halide to form a lead halide solution, introducing a Group 1 metal halide a second solvent into a second vessel and contacting the Group 1 metal halide with the second solvent to dissolve the Group 1 metal halide to form a Group 1 metal halide solution, and contacting the lead halide solution with the Group 1 metal halide solution to form a thin-film precursor ink. The method further comprises depositing the thin-film precursor ink onto a substrate, drying the thin-film precursor ink to form a thin film, annealing the thin film; and rinsing the thin film with a salt solution.

The present invention provides a method for producing perovskite luminescent particles with a low FWHM and a PLQY exceeding 85%, even when the emission peak wavelength is 535 nm or higher. [Solution] The process of preparing a solution involves dissolving lead bromide, an organic acid, and an amine in a solvent, and controlling the process temperature T (°C) and process time t (seconds).

The invention discloses a method for recovering high-purity lead halide from a perovskite solar cell. The method comprises the following steps: firstly, carrying out hydroformylation on chloromethylated polystyrene resin, grafting with polyethyleneimine, and reacting with carbon disulfide to prepare selective adsorption resin; secondly, sequentially pretreating the perovskite cell with chlorobenzene to obtain a perovskite layer; immersing the perovskite layer in deionized water for ultrasonic treatment to obtain a mixed solution; adding the selective adsorption resin into the mixed solution, wherein the adsorbed liquid is an iodine-rich solution; carrying out gradient acid elution on the adsorbed resin, oxidizing through hydrogen peroxide to remove tin impurities, adjusting the pH step by step, precipitating, and dissolving to obtain a high-purity lead ion solution; finally, the pH value of the iodine-rich solution is adjusted, a high-purity lead ion solution is added for a precipitation reaction, and a high-purity lead halide product is obtained after washing and drying. The high-purity lead halide recovered by the method is high in purity and excellent in recovery efficiency.

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 present invention is a method for producing perovskite type quantum dots, wherein, using a plurality of precursor solutions each containing a different element, each of the plurality of precursor solutions is heated and sprayed as an aerosol of the precursor solution, and the plurality of aerosols are collided to cause a gas phase reaction, dropping in a solvent to synthesize core particles containing the different elements. This provides a method for producing quantum dots that enables control of the particle size and yields nanoparticles with a uniform particle size even in large-scale synthesis.

The invention discloses a preparation method and device of high-purity anhydrous lead iodide particles, the whole preparation process is completed in one time in a whole-process closed inert micro-positive pressure environment, and lead iodide is prevented from being in contact with air in the preparation process, so that the oxygen content of the lead iodide particles is extremely low, the purity is extremely high, and the quality and the stability are improved. During preparation, lead iodide steam is condensed into a liquid state in a medium-temperature area and then passes through a nozzle, and spherical particles are naturally formed by utilizing the surface tension of the liquid, so that the problems of poor flowability and non-uniform dispersion of a traditional flaky or flocculent product are solved, the obtained spherical particles have better flowability, and meanwhile, the specific surface of lead iodide is greatly reduced through granulation; and the phenomena of moisture absorption and reoxidation in the use process are effectively relieved. The high-purity anhydrous lead iodide particles can be used for preparing high-quality functional films, and are particularly suitable for being used as precursor materials of photoelectric devices such as high-performance perovskite solar cells.

Providing oxygen-doped and fluorine-doped cesium and rubidium lead perovskite compounds for hard radiation detection. [Solution] Provided are an inorganic perovskite doped with oxygen or fluorine atoms, a method for producing a doped perovskite, and a hard radiation detector incorporating the doped perovskite as a photoactive layer. For this doped perovskite, lead oxide, lead fluoride, or a compound that thermally decomposes into lead oxide or lead fluoride is used as the dopant atom source. During the crystallization of the perovskite in the presence of this dopant atom source, oxygen or fluoride atoms from the dopant source are incorporated into the perovskite crystal lattice.

The present invention controls a process temperature T (°C) and a process time t (second) with which preparation of a solution is carried out by dissolving lead bromide, an organic acid, and an amine in a solvent.

This invention belongs to the field of waste resource recycling and optoelectronic material preparation technology, specifically relating to a method for preparing perovskite light-emitting / photovoltaic devices by recycling lead metal from waste lead-acid batteries. This method focuses on recycling waste lead-acid batteries through a "wet-fire-wet" green process. The disassembled electrode plates undergo desulfurization, calcination, and halogenation processes to recrystallize and obtain lead halides (PbI2 and PbBr2), which are then used as raw materials for preparing high-performance perovskite light-emitting / photovoltaic devices. The purpose of this invention is to solve the technical problems of complex production processes, high energy consumption, high cost, low recovery rate, and limited applicability in existing waste lead-acid battery recycling processes. It provides a method for purifying halides from lead paste materials from waste lead-acid batteries, changing the traditional approach to lead paste recycling. This method is simple, easy to operate, consumes little energy, has a high recovery rate, produces high-purity recycled products, and does not generate wastewater or waste gas byproducts, achieving the goal of energy conservation and emission reduction.

The invention discloses a method for synthesizing lead iodide, which comprises the following steps: S1, synthesizing a high-purity PbI2 polycrystalline raw material by dynamic equilibrium chemical vapor transport, sublimating a high-purity iodine simple substance positioned in a first temperature zone at 100-110 DEG C to generate iodine vapor in a double-temperature zone quartz ampoule which is vacuumized to high vacuum and sealed, and continuously transporting the iodine vapor to a second temperature zone, carrying out a gas-liquid interface reaction with high-purity lead molten at 410-420 DEG C; by accurately controlling the temperatures of the two temperature zones, cooling and separating after the reaction is finished to obtain a PbI2 polycrystal raw material with an accurate stoichiometric ratio; s2, growing an internal iodine pressure compensation crystal; and S3, crystal post-treatment. Through double-temperature-zone dynamic equilibrium gas phase transportation, the iodine vapor generation rate and the interface reaction consumption rate are balanced, it is ensured that the stoichiometric ratio of the PbI2 product is highly close to a theoretical value (Pb: I = 1: 2), high-quality raw materials are provided for high-quality single crystal growth from the source, the raw material yield is high, and repeatability is good.

A method of preparing a photoactive perovskite material.SOLUTION: Contacting lead halide with a first solvent to dissolve the lead halide and form a lead halide solution; contacting a Group 1 metal halide with a second solvent; Dissolving the Group 1 metal halide to form a Group 1 metal halide solution; and contacting the lead halide solution with the Group 1 metal halide solution to form the thin film precursor ink; depositing the thin film precursor ink on a substrate; drying the thin film precursor ink to form a thin film; annealing the thin film; and immersing the thin film in a salt solution comprising a third solvent and a salt selected from a specified group.SELECTED DRAWING: Figure 1

Disclosed are a perovskite material for a solar cell, the perovskite material having improved storage stability due to the addition of CsI, and a method for preparing same. A method for preparing a perovskite material according to the present invention comprises the steps of: (a) mixing cesium iodide (CsI), formamidinium iodide (FAI), and lead iodide (PbI2); (b) adding an organic solvent to the mixed mixture and then stirring at 100-140°C; and (c) filtering the stirred black powder under reduced pressure and then drying to prepare a CsdFAePbI3 (d+e=1) perovskite material.

The invention provides a method for synthesizing a perovskite crystal in a water phase and application of the perovskite crystal. The non-toxic and non-flammable deionized water is used as a reaction solvent, the cost is low, the reaction process is green and environment-friendly, the volatility and explosion risks of traditional organic solvents and acids are avoided, and potential safety hazards are reduced. According to the method, the perovskite crystals can stably exist in water by adjusting the input amount of the raw materials, the waste liquid generated by synthesizing the perovskite crystals is neutral, the harm to the environment and human bodies is greatly reduced, a large number of alkaline substances do not need to be consumed for neutralization treatment, secondary pollution is avoided, the waste liquid treatment cost is reduced, and economic benefits and environmental protection responsibility are balanced. The perovskite synthesis process provided by the invention breaks through the environmental limitation of traditional preparation, can be implemented under conventional temperature and humidity conditions, does not need inert gas protection or an ultra-low humidity environment, and is expected to produce and prepare phase pure perovskite crystals on a large scale. The invention further provides application of the method for synthesizing the perovskite crystal in the water phase in preparation of photoelectric devices.

The application discloses a method for preparing full-inorganic CsPbBr3 perovskite nanorods with controllable morphology, which comprises the following steps: by controlling the amount of water added and the ligand, high-luminous perovskite quantum dots from nanocrystals to nanorods in size can be controllably prepared; the CsPbBr3 nanorods are directly synthesized in a non-polar solution, the process of further purification is omitted, and the CsPbBr3 nanorods can be directly stored after the reaction; because the precursor PbBr2 ligand solution not only participates in the synthesis reaction but also constantly passivates the generated CsPbBr3 nanorods during the reaction, the anti-humidity stability of the prepared CsPbX3 nanomaterial is significantly enhanced, the luminous wavelength is in the range of 514-522 nm, and the anisotropy value reaches 0.15. The application not only provides a new way for preparing high-luminous CsPbX3 quantum dots, but also provides a new possibility for the industrialization and mass production of perovskite quantum dots in the future because the precursor can be well stored for a long time and the reaction process is simple and effective.

The present application relates to the field of wastewater treatment, in particular to a method for treating perovskite precursor synthesis waste liquid. ‑ (X=Br ‑ / Cl ‑ / I ‑ ) electrode potential, so that the oxidized state halogen element can be reduced and recovered in the subsequent step, and the recovery is complete. The present application does not need electrolysis, and is simple to operate and easy to industrialize; the selected precipitant soluble lead is low in cost, and at the same time, the recovered lead halide can be directly used for synthesis of perovskite precursor, reducing the waste of halogen elements and saving cost.

The application belongs to the field of perovskite materials, and discloses high-purity lead bromide and a production method thereof. The production method of the high-purity lead bromide comprises the following steps: heating and stirring a lead acetate solution, adding a hydrobromic acid solution dropwise into the lead acetate solution, keeping the reaction under the condition of heating and stirring, and then sequentially cooling, aging, solid-liquid separation, washing and drying the obtained solid particles, so that the high-purity lead bromide is obtained. The production method provided by the application controls the reaction system in an acidic environment, which can accelerate the precipitation reaction rate of lead ions and bromine ions, promote the rapid generation of lead bromide crystals, adjust the system dissolution balance in the acidic environment, reduce the solubility product Ksp of lead bromide, reduce the loss of lead ions, ensure that the lead ions are fully converted into lead bromide precipitates, and further improve the yield and purity of the product.

The invention relates to the technical field of semiconductors, in particular to a lead iodide nanosheet with a superlattice structure, a silicon-based device and a preparation method.The preparation method of the lead iodide nanosheet comprises the steps that lead iodide powder and water are mixed, heating treatment is conducted, a supersaturated solution of lead iodide is obtained and dripped on the surface of a substrate, and the supersaturated solution of lead iodide is obtained; and carrying out thermal annealing treatment on the obtained lead iodide nanosheet to obtain the lead iodide nanosheet with the 2H / 4H superlattice structure. A periodic lead iodide 2H / 4H superlattice structure is prepared by using a solventing-out crystallization method, and periodic control of a phase structure in a single hexagonal lead iodide nanosheet is realized. The periodic lead iodide with the superlattice structure is obtained by regulating and controlling the structure of lead iodide, and the periodic lead iodide is of a two-dimensional structure; due to the difference of energy bands of 2H-phase lead iodide and 4H-phase lead iodide, potential difference exists on a 2H / 4H homojunction interface, efficient interface carrier transmission is achieved, the photoelectric detection performance of the material can be effectively expanded, and especially breakthrough progress is achieved in the aspect of light response range expansion.

The invention belongs to the field of perovskite materials, and discloses high-purity lead chloride and a production method thereof. The production method comprises the following steps: heating a lead acetate solution, dropwise adding a diluted hydrochloric acid solution into the lead acetate solution, then adding a concentrated hydrochloric acid solution to adjust the pH value to 0.5-1.0, carrying out a heat preservation reaction, then cooling to room temperature, and then sequentially carrying out solid-liquid separation, washing and drying to obtain solid particles, namely the high-purity lead chloride. By accurately regulating and controlling the core reaction condition, the problems of uneven granularity, irregular morphology and insufficient purity of the product in the prior art are effectively solved, and a multiple optimization effect is realized.

The on-demand formation of Lewis base molecules for fabricating efficient and stable formamidinium lead iodide (FAPbI3)-based perovskite solar cells (PSCs). Semicarbazide hydrochloride (SECl) is incorporated as an additive in the perovskite precursor, which deprotonates to form semicarbazide (SE) molecules when needed to stabilize the intermediate 𝛿 phase. SE molecules protonate again to form SECl salt when they must be removed rapidly to accelerate the transition from the intermediate 𝛿 phase to the photovoltaic 𝛼 phase, leading to high film quality and homogeneous vertical distributions of A-site cations.

The application discloses a method for wetly and cooperatively recovering lead and zinc from manganese fly ash and preparing trimanganese tetraoxide, valuable elements in the manganese fly ash are separated and recovered through hydrometallurgical technologies such as water immersion for salt removal, selective leaching of zinc by using dilute hydrochloric acid with a specific concentration, complex leaching of lead by using an acidic sodium chloride solution, and the like, and finally, trimanganese tetraoxide products, lead compounds and zinc compounds are obtained; the application replaces a traditional sulfuric acid system with a hydrochloric acid system, thereby avoiding adverse effects of impurity calcium sulfate on experiments; through accurate control of leaching conditions and an innovative washing process, a complex pollution problem caused by introduction of chloride ions is effectively solved, efficient and high-selectivity separation and recovery of manganese, lead and zinc are realized, a process flow is simple, product purity is high, and the application provides a comprehensive solution with economic efficiency and low carbon for recovery of the manganese fly ash.