Steric Impediment of Ion Migration Contributes to Improved Operational Stability of Perovskite Solar Cells

Tan, Shaun; Yavuz, Ilhan; De Marco, Nicholas; Huang, Tianyi; Lee, Sung‐Joon; Choi, Christopher S.; Wang, Minhuan; Nuryyeva, Selbi; Wang, Rui; Zhao, Yepin; Wang, Hao‐Cheng; Han, Tae‐Hee; Dunn, Bruce; Huang, Yu; Lee, Jin‐Wook; Yang, Yang

doi:10.1002/adma.201906995

Steric Impediment of Ion Migration Contributes to Improved Operational Stability of Perovskite Solar Cells

Journal Article · Tue Feb 04 00:00:00 EST 2020 · Advanced Materials

DOI:https://doi.org/10.1002/adma.201906995· OSTI ID:1597115

Tan, Shaun ^[1]; Yavuz, Ilhan ^[2]; De Marco, Nicholas ^[3]; Huang, Tianyi ^[3]; Lee, Sung‐Joon ^[3]; Choi, Christopher S. ^[3]; Wang, Minhuan ^[3]; Nuryyeva, Selbi ^[3]; Wang, Rui ^[3]; Zhao, Yepin ^[3]; Wang, Hao‐Cheng ^[3]; Han, Tae‐Hee ^[4]; Dunn, Bruce ^[3]; Huang, Yu ^[3]; ^[5]; ^[3]

Univ. of California, Los Angeles, CA (United States); University of California, Los Angeles
Marmara Univ., Istanbul (Turkey)
Univ. of California, Los Angeles, CA (United States)
Univ. of California, Los Angeles, CA (United States); Hanyang Univ., Seoul (Korea, Republic of)
Univ. of California, Los Angeles, CA (United States); Sungkyunkwan Univ., Suwon (Republic of Korea)

The operational instability of perovskite solar cells (PSCs) is understood to mainly originate from the migration of ionic species (or charged defects) under a potential gradient. Compositional engineering of the “A” site cation of the ABX3 perovskite structure has been shown to be an effective route to improve the stability of PSCs. Here, the effect of size-mismatch-induced lattice distortions on the ion migration energetics and operational stability of PSCs is investigated. It is determined that the size mismatch of the mixed “A” site composition films and devices leads to a steric effect to impede the migration pathways of ions to increase the activation energy of ion migration, which is demonstrated through multiple theoretical and experimental evidence. Consequently, the mixed composition devices exhibit significantly improved thermal stability under continuous heating at 85 °C and operational stability under continuous 1 sun illumination, with an extrapolated lifetime of 2011 h, compared to the 222 h of the reference device.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of California, Los Angeles, CA (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Solar Energy Technologies Office; USDOE Office of Energy Efficiency and Renewable Energy (EERE), Solar Energy Technologies Office

Grant/Contract Number:: EE0008751

OSTI ID:: 1597115

Alternate ID(s):: OSTI ID: 1668456
OSTI ID: 1597163

Journal Information:: Advanced Materials, Journal Name: Advanced Materials Journal Issue: 11 Vol. 32; ISSN 0935-9648

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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