5 results about "Inorganic lead" patented technology

The invention relates to an aluminate composite inorganic lead halide perovskite quantum dot and a preparation method and application thereof, and belongs to the technical field of perovskite quantum dots. The preparation method of the aluminate composite inorganic lead halide perovskite quantum dot comprises the following steps: S1, sufficiently and uniformly mixing an aluminum source and a metal source, performing high-temperature calcination, and cooling to obtain aluminate; s2, mixing a lead source, diethylene glycol monobutyl ether, 1-octadecene, oleylamine and oleic acid, adding a cesium source, carrying out a first microwave reaction, and rapidly cooling after the reaction is finished; then adding aluminate, carrying out a second microwave reaction, and rapidly cooling after the reaction is finished, so as to obtain a mixed solution; and S3, centrifuging the mixed solution, collecting a solid, washing with a first organic solvent, centrifuging, collecting the solid, and dispersing in a second organic solvent for storage. The aluminate is compounded with the perovskite quantum dots, so that the light-emitting quantum efficiency of the perovskite quantum dots can be improved, and meanwhile, the light stability, the polar environment stability and the thermal stability of the perovskite quantum dots are improved.

Although the perovskite material has remarkable advantages in the field of near infrared (NIR) luminescence, some key defects still exist, and the practical application of the perovskite material is limited. The following main defects and root analysis are as follows: the stability problem (core challenge) lead-based perovskite (such as MAPbI3) is easy to decompose into PbI2 and organic salt when encountering water, and NIR luminescence is rapidly attenuated. In tin-based perovskite (such as MASnI3), Sn < 2 + > is easier to oxidize into Sn < 4 + >, resulting in material failure. In order to solve the problems, an organic material and an organic molecule are selected to replace a traditional A-site inorganic element, metal Mo < 4 + > is used to replace a traditional B-site lead base, the (C8H22N2Cl) 2MoCl5CH3 organic-inorganic lead-free perovskite near-infrared luminescent material is synthesized, and the material has important significance on research on the luminescent property and luminescent property of novel lead-free perovskite.

The invention provides a solar cell, a preparation method and a perovskite layer structure, and can be widely applied to the technical field of cells. A tunneling transparent conductive oxide layer deposited on the bottom cell; the hole transport layer is deposited on the tunneling transparent conductive oxide layer; the perovskite layer is deposited on the hole transport layer and is prepared based on an all-inorganic lead-free perovskite material, a second site of the all-inorganic lead-free perovskite material comprises tin ions, and the all-inorganic lead-free perovskite material comprises an antioxidant; the electron transport layer is deposited on the perovskite layer; and the metal electrode layer is deposited on the electron transport layer to form a complete structure of the solar cell. According to the invention, the toxicity problem of the lead-based perovskite material in the related technology is relieved, the stability of the perovskite layer is improved, and the photoelectric performance and reliability of the solar cell are further improved.

The invention discloses a preparation method of a chemical vapor deposition full-inorganic lead halide perovskite thin film. The method comprises the following steps: fixing a substrate in a low-temperature area of a high-temperature tube furnace; preparing a mixed precursor composed of cesium halide, lead halide and tin halide powder; placing the prepared mixed precursor in a heating constant-temperature area in the middle of a tubular furnace; introducing inert gas to form one-way airflow in the tubular furnace; and heating the mixed precursor in the tubular furnace, and reacting for a period of time to obtain the full-inorganic lead halide perovskite thin film. The thickness of the all-inorganic lead halide perovskite thin film can be effectively regulated and controlled by controlling the relative molar ratio of tin halide to lead halide, and the structural defect density in the thin film is effectively reduced, so that the stability of the all-inorganic lead halide perovskite thin film is effectively improved.

The method comprises the following steps: mixing cesium carbonate, lead halide, 1-octadecene and an organic ligand, then carrying out gradual heating, fully utilizing the solubility difference of raw materials under a low-temperature condition, firstly forming an intermediate phase Cs4PbX6 under the low-temperature condition, and carrying out one-pot in-situ phase transformation on the intermediate phase Cs4PbX6 to obtain the all-inorganic lead halide perovskite nanocrystal. And reacting the intermediate phase with gradually dissolved PbX2 at a relatively high temperature to form the CsPbX3 nanocrystal in situ. According to the invention, through the formation of the intermediate phase, the formation process of the CsPbX3 nanocrystal is delayed, the growth process of the nanocrystal is effectively regulated and controlled, and the perovskite nanocrystal with excellent fluorescence performance can be obtained. The method has the advantages of simple preparation process, cheap and easily available raw materials, mild reaction conditions, no need of inert protective atmosphere, good reproducibility, easy batch preparation and the like, and can promote large-scale preparation and commercial application of the perovskite nanocrystals.