Influencing Mechanism of the Selenization Temperature and Time on the Power Conversion Efficiency of Cu2ZnSn(S,Se)4-Based Solar Cells

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• 作者：Zhen-Yu Xiao ; Bin Yao ; Yong-Feng Li ; Zhan-Hui Ding ; Zhong-Min Gao ; Hai-Feng Zhao ; Li-Gong Zhang ; Zhen-Zhong Zhang ; Ying-Rui Sui ; Gang Wang
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：July 13, 2016
• 年：2016
• 卷：8
• 期：27
• 页码：17334-17342
• 全文大小：699K
• 年卷期：0
• ISSN：1944-8252

文摘

Cu₂ZnSn(S,Se)₄ (CZTSSe) films were deposited on the Mo-coated glass substrates, and the CZTSSe-based solar cells were successfully fabricated by a facile solution method and postselenization technique. The influencing mechanisms of the selenization temperature and time on the power conversion efficiency (PCE), short-circuit current density (J_sc), open-circuit voltage (V_oc), and fill factor (FF) of the solar cell are systematically investigated by studying the change of the shunt conductance (G_sh), series resistance (R_s), diode ideal factor (n), and reversion saturation current density (J₀) with structure and crystal quality of the CZTSSe film and CZTSSe/Mo interface selenized at various temperatures and times. It is found that a Mo(S_1–x,Se_x)₂ (MSSe) layer with hexagonal structure exists at the CZTSSe/Mo interface at the temperature of 500 °C, and its thickness increases with increasing selenization temperature and time. The MSSe has a smaller effect on the R_s, but it has a larger influence on the G_sh, n, and J₀. The PCE, V_oc, and FF change dominantly with G_sh, n, and J₀, while J_sc changes with R_s and G_sh, but not R_s. These results suggest that the effect of the selenization temperature and time on the PCE is dominantly contributed to the change of the CZTSSe/CdS p–n junction and CZTSSe/MSSe interface induced by variation of the quality of the CZTSSe film and thickness of MSSe in the selenization process. By optimizing the selenization temperature and time, the highest PCE of 7.48% is obtained.