Jump to main content
Jump to site search


Suppressing Defects Through Synergistic Effect of Lewis Base and Lewis Acid for Highly Efficient and Stable Perovskite Solar Cells

Abstract

Achieving long-term operational stability at 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 Lewis base and Lewis acid by combining the commercial bis-PCBM mixed isomers as Lewis acid in the antisolvent and N-(4-bromophenyl)thiourea (BrPh-ThR) as Lewis base in the perovskite solution precursor. The combination of Lewis base and Lewis acid synergistically passivates Pb2+ and PbX3- antisite defects, enlarges 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 150 days at room temperature and dropped by 10% after 1,500 h under continuous operation at 1-sun illumination and 55oC in nitrogen with maximum power-point tracking.

Back to tab navigation

Supplementary files

Publication details

The article was received on 02 Aug 2018, accepted on 05 Oct 2018 and first published on 08 Oct 2018


Article type: Paper
DOI: 10.1039/C8EE02252F
Citation: Energy Environ. Sci., 2018, Accepted Manuscript
  •   Request permissions

    Suppressing Defects Through Synergistic Effect of Lewis Base and Lewis Acid for Highly Efficient and Stable Perovskite Solar Cells

    F. Zhang, D. Bi, N. Pellet, C. Xiao, Z. Li, J. J. Berry, S. M. Zakeeruddin, K. Zhu and M. Grätzel, Energy Environ. Sci., 2018, Accepted Manuscript , DOI: 10.1039/C8EE02252F

Search articles by author

Spotlight

Advertisements