Impressive self-healing phenomenon of Cu2ZnSn(S, Se)4 solar cells<xref rid="cpb_27_6_066108_fn1" ref-type="fn">*</xref><fn id="cpb_27_6_066108_fn1"> <label>*</label> Project supported by the National Natural Science Foundation of China (Grant Nos. 91733301, 51761145042, 91433205, 11474333, 51421002, 51627803, and 51572288) and the International Partnership Program of the Chinese Academy of Sciences (Grant No. 112111KYSB20170089). </fn>

Impressive self-healing phenomenon of Cu₂ZnSn(S, Se)₄ solar cells* *

Project supported by the National Natural Science Foundation of China (Grant Nos. 91733301, 51761145042, 91433205, 11474333, 51421002, 51627803, and 51572288) and the International Partnership Program of the Chinese Academy of Sciences (Grant No. 112111KYSB20170089).

Yu Qing^{1, 2}, Shi Jiangjian¹, Zhang Pengpeng^{1, 2}, Guo Linbao^{1, 2}, Min Xue^{1, 2}, Luo Yanhong^{1, 2}, Wu Huijue¹, Li Dongmei^{1, 2, †}, Meng Qingbo^{1, 2, ‡}

(color online) (a) Band alignments theoretically simulated by AMPS-1D with different defect densities (1 × 10¹⁷ cm⁻³ for “0 d”, 1 × 10¹⁶ cm⁻³ for “7 d”). (b) XPS measured valence band spectrum of CZTSSe sample, CdS sample and the 7-days change of several nanometers coated CZTSSe film (CdS/CZTSSe sample). The black dot lines are only guides for the eye and indicate the approximate VBM positions, according to the linear extrapolation method. The spectra of CdS/CZTSSe sample is divided by the zero point of CdS sample’s density of states, named part I and part II.