Hydrothermal preparation method of CU2ZnSnS4, CU2ZnSnS4 material and application thereof

Abstract

The invention relates to a hydrothermal preparation method of CU2ZnSnS4, a CU2ZnSnS4 material and application thereof. The method comprises the steps of: (1) respectively adding copper salt, zinc salt, tin salt, a reducing agent and a sulphur source into a polytetrafluoroethylene reaction kettle according the mmol ratio of 2:1:1:x when the amount of the substances are expressed through mmol, and then adding water for dissolving so as to prepare a solution with the concentration of 0.01-0.5 M, wherein the x is the amount of the reducing agent and is equal to 1-5, and the amount of the sulphur source is 1-20 times the sum of the copper salt, the zinc salt and the tin salt; and (2) reacting for 1h-24h at the reaction temperature of 100-200 DEG C, and then separating the product to prepare the CU2ZnSnS4 material. According to the method, the operation steps are simple, the reaction is fast, the cost is low, and the prepared CU2ZnSnS4 nano material is pure in phase and small in particle size and can be used for manufacturing solar absorbing layer materials and solar cells.

Description

technical field [0001] The invention relates to a method for forming Cu 2 ZnSnS 4 The hydrothermal preparation method and its Cu 2 ZnSnS 4 Materials and uses. Background technique [0002] Solar energy is an inexhaustible clean energy source, which provides huge energy to the earth, which is about 10,000 times the energy consumed by human beings every year. If human beings can use solar energy as a resource, not only the energy crisis faced by human beings can be solved, but also the ecological environment crisis accompanied by previous energy consumption can be eliminated. Since the development of silicon solar cells in 1954, solar cell technology has developed rapidly. Due to the aggravation of the energy crisis, people are more and more interested in renewable energy, and solar cells have also entered a stage of rapid development, which also makes solar cell materials become the focus of research. However, the utilization of solar energy is not very popular yet, and...

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Problems solved by technology

Hefei University of Technology adopts the method of water co-precipitation and then high temperature and high pressure hydrothermal treatment of the reaction product to prepare Cu 2 ZnSnS 4 Compound (CN 101780974A), but there are impurity peaks in the X-ray figure given by it, indicating that the prepared Cu 2 ZnSnS 4 It is difficult to obtain a pure phase of the compound

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