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Cation Substitution of Solution‐Processed Cu 2 ZnSnS 4 Thin Film Solar Cell with over 9% Efficiency
Author(s) -
Su Zhenghua,
Tan Joel Ming Rui,
Li Xianglin,
Zeng Xin,
Batabyal Sudip Kumar,
Wong Lydia Helena
Publication year - 2015
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201500682
Subject(s) - czts , kesterite , materials science , thin film , solar cell , band gap , microstructure , energy conversion efficiency , phase (matter) , cadmium sulfide , grain size , band bending , analytical chemistry (journal) , optoelectronics , nanotechnology , metallurgy , chemistry , organic chemistry , chromatography
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.