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Method for preparing copper-zinc-tin-sulfur light absorbing layer of film solar batter

A light-absorbing layer, copper-zinc-tin-sulfur technology, applied in the manufacture of circuits, electrical components, final products, etc., can solve the problems of difficult control of high temperature and high pressure, restrictions on large-scale promotion, and restrictions on large-scale production, so as to improve safety, Widening of large-scale industrialization, the effect of solving cost and environmental pollution problems

Inactive Publication Date: 2012-07-18
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

IBM Company used hydrazine (NH2NH2) as a solvent to prepare CZTS solution by solution method, and then spin-coated and heat-treated the CZTS solar cell to achieve a conversion efficiency of 10.1%. , but hydrazine is a highly volatile and highly toxic solvent, which limits the large-scale promotion of this method ("Progress in Photovoltaics: Research and Applications" 2012, 20, 1, 6-11)
In addition, after the CZTS nanocrystals are prepared by the organic liquid phase method, the CZTS solar cell absorber layer is prepared by forming a film in an inert atmosphere and then selenized. This method requires Schlenk's complex reaction device or high temperature and high pressure reaction conditions ("Journal of the American Chemical Society 》2010, 132, 17384-17386), the equipment is complicated, and the high temperature and high pressure are difficult to control, which limits the use of this method for large-scale production

Method used

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  • Method for preparing copper-zinc-tin-sulfur light absorbing layer of film solar batter
  • Method for preparing copper-zinc-tin-sulfur light absorbing layer of film solar batter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) According to the molecular formula Cu 2 ZnSnS 4 The molar ratio of Cu, Zn, Sn and S weighed 1.271g of Cu, 0.654g of Zn, 1.187g of Sn and 1.283g of S, mixed them, added 20mL of ethanol and mixed them well, then put them in a ball mill Ball milling for 10 hours, ball milling to prepare CZTS nano-ink;

[0025] (2) Spin-coat the prepared CZTS nano-ink onto the cleaned soda-lime glass, place it on an electric furnace and dry it at 50°C for 10 minutes, remove the dispersant, and prepare a CZTS precursor film;

[0026] (3) Place the prepared CZTS precursor film in a tube furnace, and vulcanize it in sulfur vapor to prepare the CZTS film; put an appropriate amount of elemental sulfur in the graphite box, and place the CZTS precursor film substrate material on In the graphite box, place the graphite box at the center of the tube furnace, feed nitrogen gas with a flow rate of 50 sccm, raise the temperature to 250 °C at a rate of 10 °C / min, keep it for 20 minutes, and then i...

Embodiment 2

[0029] (1) According to the molecular formula Cu 2 Zn 1.2 SnS 4 The molar ratio of Cu, Zn, Sn and S in the formula weighs 1.271g of Cu, 0.785g of Zn, 1.187g of Sn and 1.283g of S, mixes them, adds 40mL of butanol and mixes them well, then puts them in a ball mill jar Carry out ball milling for 20 hours, and prepare CZTS nano-ink by ball milling;

[0030](2) Spray the prepared CZTS nano ink onto the cleaned copper sheet, place it on an electric furnace and dry it at 100°C for 30 minutes, remove the dispersant, and prepare a CZTS precursor film;

[0031] (3) Place the prepared CZTS precursor film in a tube furnace, and vulcanize it in sulfur vapor to prepare the CZTS film; put an appropriate amount of elemental sulfur in the graphite box, and place the CZTS precursor film substrate material on In the graphite box, place the graphite box at the center of the tube furnace, feed argon gas with a flow rate of 30 sccm, raise the temperature to 250 °C at a rate of 15 °C / min, keep i...

Embodiment 3

[0034] (1) According to the molecular formula Cu 1.8 Zn 1.2 sn 0.9 S 4 In the molar ratio of Cu, Zn, Sn and S, weigh 1.144g of Cu, 0.785g of Zn, 1.068g of Sn and 1.283g of S, mix them, add 25mL of 2-methoxyethanol and mix well, then place Carry out ball milling in the ball mill tank for 30 hours, and prepare CZTS nano-ink by ball milling;

[0035] (2) Inkjet print the prepared CZTS nano-ink on the polyimide that has been cleaned, place it on an electric furnace and dry it at 80°C for 15 minutes, remove the dispersant, and prepare a CZTS precursor film;

[0036] (3) Place the prepared CZTS precursor film in a tube furnace, and vulcanize it in sulfur vapor to prepare the CZTS film; put an appropriate amount of elemental sulfur in the graphite box, and place the CZTS precursor film substrate material on In the graphite box, place the graphite box at the center of the tube furnace, feed nitrogen gas with a flow rate of 40 sccm, raise the temperature to 300 °C at a rate of 25 °...

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Abstract

The invention relates to a technology for preparing a film solar battery, and in particular relates to a method for preparing a copper-zinc-tin-sulfur light absorbing layer. The method for preparing the copper-zinc-tin-sulfur light absorbing layer comprises the following steps of: (1) mixing copper, zinc, tin and sulfur simple substances in a stoichiometric ratio, adding a dispersant into the mixture, fully mixing, and then performing ball milling to obtain a uniformly and stably dispersed copper-zinc-tin-sulfur (CZTS) nano-ink, wherein the mole ratio of Cu atoms to Zn atoms to Sn atoms to S atoms is (1.8-2):(1-1.3):(0.7-1):4, and the mole ratio of the dispersant to the CZTS is (1-1,000):1; (2) coating the CZTS nano-ink on a substrate, and drying in an air atmosphere to remove the dispersant to obtain a CZTS precursor film; and (3) vulcanizing the CZTS precursor film in an inert atmosphere (nitrogen or argon gas atmosphere) to obtain a CZTS light absorbing layer of a solar battery. According to the method for preparing the CZTS light absorbing layer, the equipment structure is simple, the operation is easy, the production efficiency is high, the problems of cost and environmental pollution are fundamentally solved, and a new train of thought for large-scale industrialization of CZTS-based film solar batteries is widened.

Description

[0001] technical field [0002] The present invention relates to the preparation method of thin-film solar cell in the field of new energy, in particular to copper zinc tin sulfur (Cu 2 ZnSnS 4 , abbreviated as CZTS) light absorbing layer preparation method. [0003] Background technique [0004] Energy shortage and environmental pollution are major issues facing the 21st century. The development of clean and environmentally friendly new energy to replace traditional fossil energy has become one of the effective scientific ways to solve these problems. Among them, as an inexhaustible, inexhaustible, environmentally friendly and pollution-free renewable energy, solar energy is ubiquitous, making solar photovoltaic power generation an important part of the development of new energy. At present, silicon solar cells, the most mature technology in the market, are limited in their development as the most ideal solar cell materials due to the characteristics of high pollution,...

Claims

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Application Information

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IPC IPC(8): H01L31/18
CPCY02P70/50
Inventor 刘英孔德义
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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