材料科学
光致发光
扫描电子显微镜
带隙
循环伏安法
薄膜
结晶度
电解质
化学工程
微观结构
水溶液
半导体
化学计量学
光电子学
电化学
纳米技术
复合材料
化学
电极
工程类
物理化学
有机化学
作者
Yi-Hsuan Pan,Hongmei Deng,Dongliang Zheng,Jianxin Chen,Yilian Zhong,Jiahua Tao,Pingxiong Yang,Junhao Chu
标识
DOI:10.1007/s10854-021-07327-x
摘要
The semiconductor copper bismuth sulphide (Cu3BiS3) has been perceived as a promising photovoltaic (PV) absorber material thanks to its proper bandgap, high absorption coefficient and nontoxic component elements. However, the lack of high-quality absorber layers with satisfactory performance hinders its development in PV filed. Herein, we developed a novel co-electrodeposition process to fabricate Cu3BiS3 thin films in weakly alkaline aqueous solution. The electrodeposition mechanism and the electrochemical behavior of ions were investigated in detail by cyclic voltammetry (CV) tests. Scanning electron microscope showed the transformation of Cu3BiS3 precursors in microstructure and morphology with the adjustment of the Cu2+ ion concentration in the electrolyte. We finally achieved Cu3BiS3 thin films with high crystallinity and desirable stoichiometric ratios. By changing the Cu/Bi content, the bandgaps can be tuned from 1.33 to 1.52 eV. Photoluminescence (PL) spectra revealed two kinds of defects related to radiation recombination in the Cu3BiS3 film.
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