捷克先令
锌黄锡矿
材料科学
薄膜
太阳能电池
带隙
微观结构
能量转换效率
相(物质)
硫化镉
粒度
带材弯曲
分析化学(期刊)
光电子学
纳米技术
冶金
有机化学
化学
色谱法
作者
Zhenghua Su,Joel Ming Rui Tan,Xianglin Li,Xin Zeng,Sudip Kumar Batabyal,Lydia Helena Wong
标识
DOI:10.1002/aenm.201500682
摘要
To alleviate the limitations of pure sulfide Cu 2 ZnSnS 4 (CZTS) thin film, such as band gaps adjustment, antisite defects, secondary phase and microstructure, Cadmium is introduced into CZTS thin film to replace Zn partially to form Cu 2 Zn 1− x Cd x SnS 4 (CZCTS) thin film by low‐cost sol–gel method. It is demonstrated that the band gaps and crystal structure of CZCTS thin films are affected by the change in Zn/Cd ratio. In addition, the ZnS secondary phase can be decreased and the grain sizes can be improved to some degree by partial replacement of Zn with Cd in CZCTS thin film. The power conversion efficiency of CZTS solar cell device is enhanced significantly from 5.30% to 9.24% (active area efficiency 9.82%) with appropriate ratio of Zn/Cd. The variation of device parameter as a function of Zn/Cd ratio may be attributed to the change in electronic structure of the bulk CZCTS thin film (i.e., phase change from kesterite to stannite), which in turn affects the band alignment at the CZCTS/buffer interface and the charge separation at this interface.
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