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Steric Impediment of Ion Migration Contributes to Improved Operational Stability of Perovskite Solar Cells
Author(s) -
Tan Shaun,
Yavuz Ilhan,
De Marco Nicholas,
Huang Tianyi,
Lee SungJoon,
Choi Christopher S.,
Wang Minhuan,
Nuryyeva Selbi,
Wang Rui,
Zhao Yepin,
Wang HaoCheng,
Han TaeHee,
Dunn Bruce,
Huang Yu,
Lee JinWook,
Yang Yang
Publication year - 2020
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201906995
Subject(s) - materials science , ion , chemical physics , steric effects , ionic bonding , thermal stability , perovskite (structure) , instability , thermal , chemical engineering , thermodynamics , chemistry , mechanics , physics , organic chemistry , stereochemistry , engineering
The operational instability of perovskite solar cells (PSCs) is known 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 ABX 3 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 observed 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.