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Simple and efficient method for synthesizing Cs2AgI3 perovskite

A perovskite, high-efficiency technology, applied in chemical instruments and methods, silver compounds, silver compounds, etc., can solve the problems of requiring follow-up treatment, long production cycle, complicated operation process, etc., and achieves simple method, convenient operation, and easy industrialization. production effect

Active Publication Date: 2020-02-14
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method consumes a lot of energy, takes a long time, and cannot obtain pure phase Cs 2 AgI 3 , the product is also doped with CsAgI 2 and unreacted CsI
The method is complicated in operation process and requires follow-up treatment, which consumes a lot of energy and has a long production cycle, which is not conducive to industrial production.
[0004] In summary, the existing synthetic Cs 2 AgI 3 method has certain disadvantages and limitations

Method used

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  • Simple and efficient method for synthesizing Cs2AgI3 perovskite
  • Simple and efficient method for synthesizing Cs2AgI3 perovskite
  • Simple and efficient method for synthesizing Cs2AgI3 perovskite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Mix 1mmol cesium iodide and 1mmol silver iodide, then add 60uL dodecyl mercaptan, put 25 agate balls with a diameter of 6mm into a 25ml agate jar, adjust the AC frequency of the ball mill to 35Hz, and the speed at this time is 1050rad / min , mechanically milled for 3 hours, the mixture gradually hardened from a fluffy light yellow powder and adhered to the wall of the agate jar, and irradiated with a 254nm ultraviolet lamp, it was found that the fluorescence brightness of the product no longer continued to increase. The product was heat-treated in a vacuum oven at 200°C for 2 hours. The white product obtained after heat treatment was frozen at -30°C for 2 hours, and the product was subjected to solid absorption analysis and fluorescence test. The band edge absorption diagram is as follows: figure 1 As shown, the emission spectrum is shown as figure 2 As shown, the fluorescence efficiency is 12.3%, and the XRD pattern of the product is as follows image 3 shown by im...

Embodiment 2

[0020] The dosage of dodecylmercaptan in Example 1 is changed from 60uL to 30uL, 80uL, and 100uL respectively, and other conditions and steps are unchanged. The fluorescence efficiency of each product is measured to be 7.8%, 5.5%, and 5.7%, respectively, so The optimum dosage of dodecyl mercaptan is 60uL.

Embodiment 3

[0022] The heat treatment temperature in Example 1 was changed from 200°C to 120°C, 250°C, and 350°C, respectively, and the fluorescent quantum efficiencies of the products obtained at different temperatures were 4.9%, 5.3%, and 6.2%, respectively. Therefore, the optimum heat treatment temperature is 200°C.

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Abstract

The invention discloses a simple and efficient method for synthesizing Cs2AgI3 perovskite, and belongs to the technical field of semiconductor nanomaterial preparation. First cesium iodide and silveriodide are mixed at a molar ratio of 1:1 and then1-dodecanethiol is added for grinding, during the grinding process, a 254 nm ultraviolet lamp is used for monitoring, the grinding is stopped when thebrightness of the product is no longer increased, the obtained product is subjected to heat treatment in a vacuum oven at 120-350 DEG C for 3 h, and the white product obtained after heat treatment issubjected to freezing treatment at -10 DEG C to -50 DEG C for 1-3 h to obtain the Cs2AgI3 non-lead all-inorganic perovskite with improved fluorescence yield. The method realizes preparation of the pure phase Cs2AgI3 by mechanical grinding for the first time. At the same time, the method has the advantages of convenient operation, simple method, easy realization of industrialized production, and the like.

Description

technical field [0001] The invention belongs to the technical field of semiconductor nanomaterial preparation, and specifically relates to an efficient and high-purity all-inorganic non-lead Cs 2 AgI 3 Preparation method of perovskite. Background technique [0002] In recent years, metal lead halide perovskites have gone from being relatively unknown to a seriously studied material. Metal lead halide perovskite solar cells have reached commercially viable efficiency levels. There are three processes to go through to achieve commercialization, developing a cost-effective, large-scale production route, improving moisture stability, modules that can be used in outdoor environments without resorting to expensive packaging methods, and discovering metal halide alternatives that do not contain parasites. Environmentally harmful elements such as lead. Most countries in the world are trying to get rid of lead-containing materials. While there may be room for lead halide perovsk...

Claims

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Application Information

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IPC IPC(8): C01G5/00
CPCC01G5/006C01P2002/34C01P2002/72C01P2004/01
Inventor 张颖郭雪源张资序汪大洋杨文胜
Owner JILIN UNIV
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