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    Efficient and Stable Inverted Planar Perovskite Solar Cells Using a Triphenylamine Hole-Transporting Material

    Year: 2018

    Journal: ChemSusChem, Volume 11, MAY 9, page 1467–1473

    Authors: Chen, Rui; Bu, Tongle; Li, Jing; Li, Wei; Zhou, Peng; Liu, Xueping; Ku, Zhiliang; Zhong, Jie; Peng, Yong; Huang, Fuzhi; Cheng, Yi-Bing; Fu, Zhengyi

    Organizations: National Natural Science Foundation of China [NSFC 51672202]; Technological Innovation Key Project of Hubei Province [2016AAA041]

    Keywords: hole-transport material; inverted planar structure; perovskite; solar cells; triphenylamine

    Inverted perovskite solar cells (PSCs) with a p-i-n structure have attracted great attention. Normally, inorganic p-type metal oxides or polymers are used as the hole-transport material (HTM), a vital component in the inverted PSCs. However, this type of HTM often requires high processing temperatures and/or high costs. On the other hand, a commonly used organic HTM, poly(3,4-ethylenedioxythiophene polystyrene sulfonate (PEDOT:PSS), is sensitive to humidity and thus affects the stability of the PSCs. Herein, we employ a small molecule, 4,4,4-tris(N-3-methylphenyl-N-phenylamino) triphenylamine (m-MTDATA) to replace PEDOT:PSS as a new HTM for inverted PSCs. Compared to a PEDOT:PSS-based device, m-MTDATA-based PSCs exhibit enhanced performance. The highest power conversion efficiency (PCE) was notably improved from 13.44% (PEDOT:PSS) to 18.12% (m-MTDATA), suggesting that m-MTDATA could be an efficient HTM to achieve high performance inverted PSCs. Furthermore, the m-MTDATA-based device demonstrated improved stability (retaining 90% PCE) under ambient conditions over 1000 h compared with the PEDOT:PSS-based devices (retaining 40% PCE).
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