溶剂热法制备球状Cu2ZnSnS4纳米晶及其表征

doi:10.3866/PKU.WHXB20112920

Abstract

Abstract: A simple solvothermal route has been successfully used to prepare Cu₂ZnSnS₄ nanocrystals using metal chloride and L-cysteine as precursors at 180 °C for 16 h. L-cysteine was used as the sulfide source and complexing agent. The phase, structure, morphology, and optical properties of the assynthesized products were characterized by powder X-ray diffraction (XRD), field-emission scan electron microscopy (FESEM), energy dispersive spectrometry (EDS), high-resolution electron transmission microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), and ultraviolet-visible (UV-Vis) spectrophotometer. The results showed that pure kesterite-type Cu₂ZnSnS₄ nanocrystals were prepared under this condition and the diameters of the microspheres were about 400-800 nm while the microspheres consisted of nanoflakes with thickness of 20 nm. The band gap of CZTS nanoparticles was about 1.58 eV，which was close to the optimum band gap of thin film solar cells. A possible formation mechanism was also discussed.

Key words: Cu₂ZnSnS₄ nanocrystal, Solvothermal method, L-cysteine, Solar cell

CAI Qian, LIANG Xiao-Juan, ZHONG Jia-Song, SHAO Ming-Guo, WANG Yun, ZHAO Xiao-Wei, XIANG Wei-Dong. Synthesis and Characterization of Sphere-Like Cu₂ZnSnS₄ Nanocrystals by Solvothermal Method[J]. Acta Phys. -Chim. Sin. 2011, 27(12), 2920-2926. doi: 10.3866/PKU.WHXB20112920

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Synthesis and Characterization of Sphere-Like Cu₂ZnSnS₄ Nanocrystals by Solvothermal Method

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Synthesis and Characterization of Sphere-Like Cu₂ZnSnS₄ Nanocrystals by Solvothermal Method