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High stability formamidine perovskite material and its preparation method and application

A perovskite material, high-stability technology, applied in luminescent materials, chemical instruments and methods, final product manufacturing, etc. And other issues

Active Publication Date: 2021-09-10
YUNNAN AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Perovskite material is a new type of photoelectric material with broad application prospects. It has a very high extinction coefficient and a long carrier migration distance, which is very suitable for the development of the next generation of low-cost photovoltaic devices. Although the cationic organic-inorganic hybrid perovskite material has a narrow energy band width and high photoelectric conversion efficiency, its thermal stability is not good. The corresponding hydrohalide salt was prepared by using formamidine instead of methylamine, and then The obtained formamidine-type organic-inorganic hybrid perovskite material not only has a narrower band gap, but also has better thermal stability, and has practical application prospects
[0003] However, the crystal phase of formamidine-type perovskite is unstable, and its α-phase will quickly transform into a yellow phase that is not photovoltaically active at room temperature. Phase stability, however, this method will increase the bandgap width of the perovskite material, resulting in the separation and aggregation of cations, and the long-term stability of the material is not good

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  • High stability formamidine perovskite material and its preparation method and application

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preparation example Construction

[0021] The preparation method of high stability formamidine perovskite material comprises the following steps:

[0022] Step 1, divalent metal halide (MX 2 ), formamidine hydrohalide (FAX) and additive (FACarb) are mixed and dissolved in a large polar solvent to obtain a precursor solution, wherein MX 2 , The molar concentration ratio of FAX in a large polar solvent is 1:1, the molar ratio of additives to divalent metal halides is (0.001-0.3):1, too little additives can not stabilize the crystal phase of formamidine perovskite The purpose of adding too much will lead to a decrease in efficiency;

[0023] MX 2 +(1-n)FAX+nFACarb→MFAX 2 x (1-n) Carb (n) ;

[0024] Step 2, use spin coating, scrape coating or spraying process to make the precursor solution into a thin film, remove the high boiling point and large polar solvent by heating or anti-solvent washing, and heat at 150 ° C to obtain black formamidine calcium with photovoltaic activity Titanium ore material, the anti...

Embodiment 1

[0030] Formamidine perovskite materials were prepared using the following steps:

[0031] Step 1, measure 1mol PbI 2 Place in a 10L reaction kettle, add 4L of N,N-dimethylformamide (DMF) and 1L of dimethyl sulfoxide (DMSO), then add 1mol of formamidine iodide (FAI), heat to dissolve to obtain calcium Titanite precursor solution;

[0032] Step 2, Spin-coat the perovskite precursor solution on the glass substrate, rinse with sec-butanol to remove excess DMF and DMSO, and obtain a yellow precursor film, place the precursor film on a hot stage and heat it at 150°C to obtain a black color α-phase formamidine perovskite thin films.

Embodiment 2

[0034] When preparing the perovskite precursor solution in Example 1, 0.03 mol of benzoic acid was added to the reaction system as an additive, and the rest of the steps were the same as in Example 1.

[0035] The formamidine perovskite film prepared in Example 1 and Example 2 was exposed to the air with a relative humidity of 50% at the same time. After one day, the formamidine perovskite film prepared in Example 1 turned into a yellow phase, and the formamidine perovskite film prepared in Example 2 The formamidine perovskite film still exists stably in the α phase, indicating that the phase stability of the formamidine perovskite material can be significantly improved after adding benzoic acid.

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Abstract

The invention discloses a high-stability formamidine perovskite material and its preparation method and application. The preparation method comprises the following steps: step 1, mixing divalent metal halides, formamidine hydrohalide and specific additives , dissolved in a highly polar solution to obtain a precursor solution; step 2, use spin coating, scrape coating or spraying process to make the precursor solution into a thin film, use heating or anti-solvent to wash away the highly polar solution, and place the film at 150 The formamidine perovskite material is obtained by heating at ℃; the formamidine perovskite material prepared by the invention has good phase stability, narrow band gap width and good light operation stability.

Description

technical field [0001] The invention belongs to the technical field of photoelectric materials, and in particular relates to a formamidine perovskite material with high stability, a preparation method and an application thereof. Background technique [0002] Perovskite material is a new type of photoelectric material with broad application prospects. It has a very high extinction coefficient and a long carrier migration distance, which is very suitable for the development of the next generation of low-cost photovoltaic devices. Although the cationic organic-inorganic hybrid perovskite material has a narrow energy band width and high photoelectric conversion efficiency, its thermal stability is not good. The corresponding hydrohalide salt was prepared by using formamidine instead of methylamine, and then The obtained formamidine-type organic-inorganic hybrid perovskite material not only has a narrower band gap, but also has better thermal stability, and has practical applicat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L51/00H01L51/46C07C257/12C09K11/06
CPCC07C257/12C09K11/06H10K71/12H10K85/00Y02P70/50
Inventor 何俊杰李崧张亮李靖
Owner YUNNAN AGRICULTURAL UNIVERSITY
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