Suppressing defects through the synergistic effect of a Lewis base and a Lewis acid for highly efficient and stable perovskite solar cells

Fei Zhang, Dongqin Bi, Norman Pellet, Chuanxiao Xiao, Zhen Li, Joseph J. Berry, Shaik Mohammed Zakeeruddin, Kai Zhu, Michael Grätzel

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302 引用 (Scopus)

摘要

Achieving long-term operational stability at a high efficiency level for perovskite solar cells is the most challenging issue toward commercialization of this emerging photovoltaic technology. Here, we investigated the cooperation of a Lewis base and a Lewis acid by combining commercial bis-PCBM mixed isomers as the Lewis acid in the antisolvent and N-(4-bromophenyl)thiourea (BrPh-ThR) as the Lewis base in the perovskite solution precursor. The combination of the Lewis base and the Lewis acid synergistically passivates Pb 2+ and PbX 3- antisite defects, enlarges the perovskite grain size, and improves charge-carrier separation and transport, leading to improved device efficiency from 19.3% to 21.7%. In addition, this Lewis base and acid combination also suppresses moisture incursion and passivates pinholes generated in the hole-transporting layer. The unsealed devices remained at 93% of the initial efficiency value in ambient air (10-20% relative humidity) after 3600 h at 20-25 °C and dropped by 10% after 1500 h under continuous operation at 1-sun illumination and 55 °C in nitrogen with maximum power-point tracking.

源语言英语
页(从-至)3480-3490
页数11
期刊Energy and Environmental Science
11
12
DOI
出版状态已出版 - 12月 2018
已对外发布

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