Copper Salts Doped Spiro-OMeTAD for High-Performance Perovskite Solar Cells

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• 作者：Meng Li ; Zhao-Kui Wang ; Ying-Guo Yang ; Yun Hu ; Shang-Lei Feng ; Jin-Miao Wang ; Xing-Yu Gao and Liang-Sheng Liao
• 刊名：Advanced Energy Materials
• 出版年：2016
• 出版时间：November 9, 2016
• 年：2016
• 卷：6
• 期：21
• 全文大小：2936K
• ISSN：1614-6840

文摘

The development of effective and stable hole transporting materials (HTMs) is very important for achieving high-performance planar perovskite solar cells (PSCs). Herein, copper salts (cuprous thiocyanate (CuSCN) or cuprous iodide (CuI)) doped 2,2,7,7-tetrakis(N,N-di-p-methoxyphenylamine)-9,9-spirobifluorene (spiro-OMeTAD) based on a solution processing as the HTM in PSCs is demonstrated. The incorporation of CuSCN (or CuI) realizes a p-type doping with efficient charge transfer complex, which results in improved film conductivity and hole mobility in spiro-OMeTAD:CuSCN (or CuI) composite films. As a result, the PCE is largely improved from 14.82% to 18.02% due to obvious enhancements in the cell parameters of short-circuit current density and fill factor. Besides the HTM role, the composite film can suppress the film aggregation and crystallization of spiro-OMeTAD films with reduced pinholes and voids, which slows down the perovskite decomposition by avoiding the moisture infiltration to some extent. The finding in this work provides a simple method to improve the efficiency and stability of planar perovskite solar cells.