Study On The Properties Of Cu₂ZnSnS₄ Prepared By Hydrothermal Method

With the rapid development of industrial, we will face a variety of environmental issues and energy crises. Then we urgent need to explore the sustainable development mode between industry, environment and energy. By using the clean and renewable solar energy, photocatalytic technology, as a proper way to solve the problem of environmental pollution, can occur under milder reaction conditions, and completely mineralize the organic pollutants. The common photocatalysts are generally non-toxic, low prices, without causing secondary pollution, so the industrial development come to value this technology.Cu2Zn Sn S4(CZTS), which has an optimal band-gap closing to the optimum value for solar photoelectric conversion, high absorption coefficient and abundant elemental component, has potential application in the frontier of absorption layers of thin-film solar cells and photocatalytical catalysis.The chemical synthesis and optical performance of CZTS were studied in this paper. The details are as follows:(1) Synthesis and characterization of CZTS powders. CZTS powders have been successfully synthesized by hydrothermal method. The effect of the reaction temperature and the contents of PVP on formation of the CZTS powders was discussed. The as-grown products was characterized by XRD, SEM, EDS and UV-Vis. The results confirm that the products was polycrystalline CZTS powders with good crystallinity and band gap of the products is about 1.49 e V, which could confirm that these products was able to respond to visible light.(2) The photocatalytic ability of CZTS powders. The photocatalytic performance tests were carried out in Rhodamine B(Rh B) solution. There was 70.75% Rh B were degraded after 5 h illumination. The result showed that products exhibited a strong photocatalytic activity.(3) Deposited CZTS thin films on FTO substrates and study the photoelectric properties. A facile solvothermal method was proposed to grow CZTS thin films directly on transparent conductive FTO substrates. The phase identification, morphology and I-V liner of samples were analysed. It was revealed that CZTS thin films are composed of a large number of uniform sphere-like particles. The optical band gap is found to be 1.51 e V. In addition, when it is under illumination, the resistivity of CZTS thin films is lower than under dark.