Method for simply synthesizing CsAgCl<2> pure-phase inorganic lead-free perovskite

An inorganic non-phase-pure technology, applied in the direction of inorganic chemistry, chemical instruments and methods, lead compounds, etc., can solve the problems of unfavorable large-scale production, complicated operation, and long time consumption, and achieve easy operation, enhanced fluorescence efficiency, and low energy consumption. small effect

Inactive Publication Date: 2020-03-31
JILIN UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

Although this synthetic method can synthesize CsAgCl 2 , but the operation is complex, time-consuming and needs to be heated at a higher tempera

Method used

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  • Method for simply synthesizing CsAgCl&lt;2&gt; pure-phase inorganic lead-free perovskite
  • Method for simply synthesizing CsAgCl&lt;2&gt; pure-phase inorganic lead-free perovskite
  • Method for simply synthesizing CsAgCl&lt;2&gt; pure-phase inorganic lead-free perovskite

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Put 1mmol cesium chloride, 1mmol silver chloride, 80ul oleylamine and 25 agate balls with a diameter of 6mm into a 25ml agate jar, set the AC frequency of the ball mill to 35Hz, and the speed at this time is 1050rad / min, and mechanically grind for 2h , the mixture gradually becomes dense from a fluffy white powder and adheres to the wall of the agate jar, then becomes soft again, and finally becomes a fluffy white powder again to obtain CsAgCl 2 The inorganic perovskite is irradiated with an ultraviolet lamp with an excitation wavelength of 254nm at this time, and it is found that the product emits yellow fluorescence. The obtained product was heat-treated in a vacuum oven at 240°C for 30 minutes, and cooled at -15°C for 1h to 2h, and the fluorescence intensity was obviously enhanced. The product was subjected to solid absorption analysis and fluorescence emission test, and its absorption spectrum was as follows: figure 1 Shown; the fluorescence emission spectrum is sh...

Embodiment 2

[0022] Embodiment 2: the amount of oleylamine in Example 1 is changed from 80ul to 40ul, 100ul, 120ul respectively, and other conditions and steps are unchanged, and the fluorescence efficiency of each product recorded is 53.8%, 59.5%, 56.7%, respectively, so The optimal amount of oleylamine is 80ul.

Embodiment 3

[0024] In Example 1, a drop of water was added to the solid powder mixture of cesium chloride and silver chloride before ball milling, and the ball milling time was shortened from 2 hours to 1 hour to obtain white fluffy CsAgCl 2 Inorganic perovskite powders, showing that for CsAgCl 2 In general, adding a small amount of water helps shorten the grinding reaction time.

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Abstract

The invention discloses a method for simply synthesizing CsAgCl2 pure-phase inorganic lead-free perovskite, belonging to the technical field of preparation of semiconductor nanomaterials. The method comprises the following steps: firstly, mixing cesium chloride and silver chloride according to a molar ratio of 1: 1, then adding oleylamine, carrying out grinding, wherein the formed mixture in the form of fluffy white powder gradually becomes compact and is attached to the wall of a container, and finally becomes fluffy white powder with the grinding time, and stopping grinding; putting a sampleobtained in the previous step into a vacuum oven, and carrying out heat treatment at 60-300 DEG C for 2 h; and immediately carrying out cooling treatment at -10 DEG C to -40 DEG C for 1-2 h to obtainthe CsAgCl2 inorganic perovskite with high purity and high fluorescence efficiency. The method has the advantages that the method is simple, operation is easy, energy consumption is low, and the synthesized CsAgCl2 inorganic perovskite is pure in phase; and the method has important significance.

Description

technical field [0001] The invention belongs to the technical field of semiconductor nanomaterial preparation, and in particular relates to a simple synthesis of CsAgCl 2 A method for phase-pure inorganic lead-free perovskites. Background technique [0002] In recent years, people have made great progress in the research of organic-inorganic lead halide perovskite solar cells. It has been proved that the cell efficiency of organic-inorganic lead halide perovskite solar cells can be compared with that of CdTe thin film cells and semiconductor CuInGaS Thin-film batteries have comparable cell efficiencies. Nowadays, lead halide solar cells are gradually entering the market, and their cell efficiency can be close to that of crystalline silicon solar cells (cell efficiency is about 25%). However, its long-term instability and lead toxicity greatly limit its practical application. [0003] Based on the importance of perovskite for solar cells, people's understanding of perovski...

Claims

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Application Information

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IPC IPC(8): C01G21/00C09K11/61
CPCC01G21/006C01P2002/34C01P2006/60C09K11/616
Inventor 解仁国张资序姚佳利汪大洋杨文胜
Owner JILIN UNIV
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