Preparation method for CZTS (Se) nano-crystalline thin film

A nanocrystalline and thin film technology, applied in the field of solar photovoltaic materials, can solve the problems of difficulty in preparing CZTSSe nanocrystalline thin films, reducing photoelectric conversion efficiency of solar cell devices, poor controllability, etc., and achieving high photoelectric conversion efficiency, strong controllability, Enhanced solubility and diffusion effects

Inactive Publication Date: 2015-06-10
BEIJING UNIV OF TECH
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  • Abstract
  • Description
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Problems solved by technology

But this kind of method does not completely abandon the use of oleylamine, and oleylamine remains on Cu 2 ZnSnS 4 In nanocrystals, the photoelectric conversion efficiency of solar cell devices will be reduced
At the same time, metal chloride salts CuCl, ZnCl 2 , SnCl 4 Mixed directly with sulfur source, Cu 2 ZnSnS 4 The composition of nanocrystalline films is poorly controllable, and it is difficult to prepare CZTSSe nanocrystalline films with Cu-poor and Zn-rich features

Method used

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  • Preparation method for CZTS (Se) nano-crystalline thin film
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  • Preparation method for CZTS (Se) nano-crystalline thin film

Examples

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Embodiment 1

[0047] (1) Preparation of binary nanocrystalline particles

[0048] a. 3mmol SnCl 2 2H 2 O and 30mmol of sodium citrate were dissolved in 200ml of ethylene glycol to obtain solution A; 3mmol of Na 2 S·9H 2 O was dissolved in 100ml of ethylene glycol to obtain solution B; then, under stirring conditions, solution A and solution B were mixed together, and the resulting brown product was centrifuged to obtain a solid, which was washed 3 times with absolute ethanol and dried to obtain SnS binary nanocrystalline particles;

[0049] b. Add 5mmol Zn(CH 3 COO) 2 2H 2 The tartaric acid of O and 30mmol was dissolved in 20ml deionized water to obtain solution C; 6mmol Na 2 S·9H 2 O was dissolved in 20ml of deionized water to obtain solution D; then, under stirring conditions, solution C and solution D were mixed together, kept at 160°C for 1 hour, and the white precipitate was centrifuged, and the precipitate was washed twice with deionized water, and then Wash twice with absolu...

Embodiment 2

[0064] (1) Preparation of binary nanocrystalline particles

[0065] a. Add 6mmol SnCl 2 2H 2 O and 40mmol of acetic acid were dissolved in 200ml of triethanolamine to obtain solution A; 6mmol of Na 2 S·9H 2 O was dissolved in 100ml triethanolamine to obtain solution B; then, under stirring conditions, solution A and solution B were mixed together, and the resulting brown product was centrifuged to obtain a solid, which was washed 3 times with absolute ethanol and dried to obtain SnS Binary nanocrystalline particles, tested by TEM, have a particle size of about 20nm.

[0066] b. Add 10mmol Zn(CH 3 COO) 2 2H 2 O and 50mmol of acetic acid were dissolved in 40ml of triethanolamine to obtain solution C; 4mmol of Na 2 S·9H 2 O was dissolved in 20ml of triethanolamine to obtain solution D; then, under stirring conditions, solutions C and D were mixed together, kept at 160°C for 1 hour, and the white precipitate was centrifuged, washed twice with deionized water, and then wash...

Embodiment 3

[0077] (1) Preparation of binary nanocrystalline particles

[0078] a. Dissolve 4mmol of tin acetate and 30mmol of acetic acid in 200ml of methanol to obtain solution A; dissolve 4mmol of S powder in 100ml of methanol to obtain solution B; then mix solution A and solution B together under stirring conditions, The resulting product was centrifuged to obtain a solid, washed 3 times with absolute ethanol, and dried to obtain SnS binary nanocrystalline particles;

[0079] b. 5mmol of zinc chloride and 50mmol of citric acid were dissolved in 50ml of deionized water to obtain solution C; 3mmol of Na 2 S·9H 2 O was dissolved in 30ml of deionized water to obtain solution D; then, under stirring conditions, solution C and solution D were mixed together, kept at 100°C for 20 hours, the precipitate was centrifuged, and the precipitate was washed twice with deionized water, and then washed with Washed twice with absolute ethanol and dried to obtain ZnS binary nanocrystalline particles. ...

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Abstract

The invention discloses a preparation method for a piece of CZTS (Se) nano-crystalline thin film. The preparation method includes that preparing binary nano-crystalline particles of tin, zinc and copper, mixing the binary nano-crystalline particles and dispersing in solvent to prepare reaction precursor solution, and transferring the reaction precursor solution to the surface of a substrate to perform heat treatment to obtain the CZTS (Se) nano-crystalline thin film. The CZTS (Se) nano-crystalline thin film prepared by the method is less in impurity and defect, when the CZTS (Se) nano-crystalline thin film is used as the absorption layer of a solar cell, the conversion efficiency of the solar cell can be obviously improved; the preparation method does not use toxic substances (hydrazine and oleylamine) as solvent, and accordingly the preparation method is friendly to the environment.

Description

technical field [0001] The invention belongs to the field of solar photovoltaic materials, and in particular relates to a preparation method of a CZTS (Se) nanocrystalline thin film. Background technique [0002] With the development of the economy, the traditional energy supply has been unable to meet the growing demand of human beings for energy. Solar energy is the most abundant energy source among many renewable energy sources, and its proportion in the future energy structure will increase. It is conservatively estimated that this proportion will exceed 60% in 2100. Solar photovoltaic power generation is an important way to develop solar energy and become a new energy source. At present, the mainstream product in the photovoltaic market is still silicon solar cells. develop. Therefore, the study of new green, high-efficiency and low-cost solar cells has become an important topic for future energy development. [0003] Copper zinc tin sulfur (CuZn x sn y S z , can ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L21/02H01L31/032H01L31/18
CPCH01L21/02104H01L31/0321H01L31/18Y02P70/50
Inventor 汪浩张永政严辉刘晶冰朱满康
Owner BEIJING UNIV OF TECH
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