Premium
Three‐step process improves crystal quality of Cu 2 ZnSnS 4 absorber layer and efficiency of solar cell
Author(s) -
Fan Donghua,
Zhang Junzhi,
Wang Xianghu,
Xu Manqin,
Xu Shuai
Publication year - 2015
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.201500025
Subject(s) - czts , crystallinity , materials science , raman spectroscopy , layer (electronics) , crystal (programming language) , solar cell , scanning electron microscope , energy conversion efficiency , chemical engineering , diffraction , optoelectronics , optics , nanotechnology , composite material , physics , engineering , computer science , programming language
Cu 2 ZnSnS 4 (CZTS) films are fabricated using the three‐step process, including deposition, preheating and sulfurization of Cu–Zn–Sn (CZT) precursors. The effect of preheating temperature on structures, morphologies, and optical properties of CZTS films is investigated detailedly by X‐ray diffraction, Raman spectra, scanning electron microscopy, and UV spectrophotometer. It is found that the proper preheating temperature can improve the crystal quality of CZTS films. The prepared CZTS film by sulfurizing the preheated precursor at 300 °C presents high crystallinity, uniform surface morphology, and suitable optical properties. Compared with two‐step process, three‐step method can not only improve crystal quality of CZTS films but also decline sulfurization temperature. We also discuss the mechanism of improving the properties of CZTS absorber layer by the preheating route in detail. In addition, the experimental results also indicate that solar cell prepared by three‐step method displays higher conversion efficiency.