Steric Impediment of Ion Migration Contributes to Improved Operational Stability of Perovskite Solar Cells.
Shaun Tan,Ilhan Yavuz,Nicholas De Marco,Tianyi Huang,Sung-Joon Lee,Christopher S. Choi,Minhuan Wang,Selbi Nuryyeva,Rui Wang,Yepin Zhao,Hao Cheng Wang,Tae Hee Han,Tae Hee Han,Bruce Dunn,Yu Huang,Jin-Wook Lee,Jin-Wook Lee,Yang Yang +17 more
TLDR
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.Abstract:
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 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 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.read more
Citations
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Enhanced perovskite electronic properties via A-site cation engineering
Xufeng Xiao,Yanmeng Chu,Chunyu Zhang,Zhihui Zhang,Zexiong Qiu,Cheng Qiu,Huaixing Wang,Anyi Mei,Yaoguang Rong,Gengzhao Xu,Yue Hu,Hongwei Han +11 more
TL;DR: In this article, the authors compared the optoelectronic properties of acetamidinum (Ace) and guanidinium (Gua) mixed methylammonium lead iodide perovskites and shed a light on the hidden role of A-site cation on the carrier mobility.
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Mitigating Ion Migration by Polyethylene Glycol-Modified Fullerene for Perovskite Solar Cells with Enhanced Stability
Chenxia Kan,Zefeng Tang,Yuxin Yao,Pengjie Hang,Biao Li,Ying Wang,Xuan Sun,Ming Lei,Deren Yang,Xuegong Yu +9 more
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Dynamic structural property of organic-inorganic metal halide perovskite.
TL;DR: In this article, the dynamic properties of a site cationic molecules and PbI6 octahedrons linked with their corners from other semiconducting and dielectric materials are reviewed and summarized.
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Uncovering the Mechanism of Poly(ionic‐liquid)s Multiple Inhibition of Ion Migration for Efficient and Stable Perovskite Solar Cells
TL;DR: In this article , the authors demonstrated that defect passivation effect can be eliminated by incorporation of multifunctional poly(ionic liquid)s (PILs) additives, resulting in ultrastable perovskite solar cells (PVSCs).
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Degradation pathways in perovskite solar cells and how to meet international standards
TL;DR: In this article , the main degradation mechanisms of perovskite solar cells and key results for achieving sufficient stability to meet IEC standards are summarized and limitations for evaluating solar cell stability and commercialization potential under the current IEC standard.
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