Acta Phys. -Chim. Sin. ›› 2011, Vol. 27 ›› Issue (12): 2920-2926.doi: 10.3866/PKU.WHXB20112920

• PHYSICAL CHEMISTRY OF MATERIALS • Previous Articles     Next Articles

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

CAI Qian1, LIANG Xiao-Juan1, ZHONG Jia-Song2, SHAO Ming-Guo1, WANG Yun1, ZHAO Xiao-Wei1, XIANG Wei-Dong1,2   

  1. 1. College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou 325035, Zhejiang Province, P. R. China;
    2. School of Material Science and Engineering, Tongji University, Shanghai 200092, P. R. China
  • Received:2011-07-12 Revised:2011-09-13 Published:2011-11-25
  • Contact: LIANG Xiao-Juan, XIANG Wei-Dong;
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (50772075, 50972107) and Key Scientific and Technological Innovation Teams of Zhejiang Province, China (2009R50010).

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