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Li~+&Ag~+ and Li~+&Cd~(2+) double-ion-doping strategy to improve the efficiency of Cu2ZnSn(S,Se)4 solar cells

Junye Tong  Gang Wang  Daocheng Pan  Lingling Wang  Xintong Zhang  
【摘要】:Ion doping strategy is a promising method to enhance the efficiency of Cu_2ZnSn(S,Se)_4(CZTSSe) solar cells,however,most of the reported works focus on studying the single ion doping in CZTSSe absorber layers.Here,Li~+Ag~+and Li~+Cd~(2+) double-ion-doping strategy are applied to improve the microstructure and device performances.We found that the double-ion-doping strategy can obviously increase the grain size,reduce the thickness of fine-grain layers and enhance the device performances.Furthermore,the PCEs of Li~+Ag~+and Li~+Cd~(2+) doped CZTSSe solar cells are up to 8.87 % and 8.39 %,respectively.It shows an encouraging improvement of over 43.5 % and 35.8 % enhancement compared with the traditional method(6.18 %),and significantly higher than single ion doping strategy(7.60 %,7.99 % and 7.11 % for Li~+,Ag~+,and Cd~(2+) doped CZTSSe solar cells).This work provides a new solution to improve the microstructure and device performances of CZTSSe solar cells.

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