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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High-Efficiency Perovskite Solar Cells.
TL;DR: This review summarizes the fundamentals behind the optoelectronic properties of perovskite materials, as well as the important approaches to fabricating high-efficiency perovSKite solar cells, and possible next-generation strategies for enhancing the PCE over the Shockley-Queisser limit are discussed.
Journal ArticleDOI
Two birds with one stone: dual grain-boundary and interface passivation enables >22% efficient inverted methylammonium-free perovskite solar cells
Saba Gharibzadeh,Paul Fassl,Ihteaz M. Hossain,Pascal Rohrbeck,Markus Frericks,Moritz Schmidt,Motiur Rahman Khan,Tobias Abzieher,Bahram Abdollahi Nejand,Fabian Schackmar,Osbel Almora,Thomas Feeney,Roja Singh,Dirk Fuchs,Uli Lemmer,Jan P. Hofmann,Stefan A. L. Weber,Ulrich W. Paetzold +17 more
TL;DR: In this article, a dual passivation strategy using the long chain alkylammonium salt phenethylamium chloride (PEACl) both as an additive and for surface treatment to simultaneously passivate the grain boundaries and the perovskite/C60 interface was introduced.
Journal ArticleDOI
Stability-limiting heterointerfaces of perovskite photovoltaics
Shaun Tan,Tianyi Huang,Ilhan Yavuz,Rui Wang,Mingjie Xu,Qiyu Xing,Keonwoo Park,Do-Kyoung Lee,Chung Hao Chen,Ran Zheng,Taegeun Yoon,Yepin Zhao,Hao Cheng Wang,Dong Meng,Jingjing Xue,Young Jae Song,Xiaoqing Pan,Nam-Gyu Park,Jin-Wook Lee,Yang Micheal Yang +19 more
TL;DR: In this article , surface treatments may induce a negative work function shift (that is, more n-type), which activates halide migration to aggravate PSC instability, limiting the maximum stability improvement attainable for PSCs treated in this way.
Journal ArticleDOI
Shallow Iodine Defects Accelerate the Degradation of α-Phase Formamidinium Perovskite
Shaun Tan,Ilhan Yavuz,Marc H. Weber,Tianyi Huang,Chung Hao Chen,Chung Hao Chen,Rui Wang,Hao Cheng Wang,Hao Cheng Wang,Jeong Hoon Ko,Selbi Nuryyeva,Jingjing Xue,Yepin Zhao,Kung-Hwa Wei,Jin-Wook Lee,Yang Yang +15 more
TL;DR: In this article, the authors show that shallow iodine interstitial defects (I i ) can be generated unintentionally during commonly used post-fabrication treatments, which can lower the cubic-to-hexagonal transformation barrier of FAPbI3-based perovskites to accelerate its phase degradation.
Journal ArticleDOI
Molecular Interaction Regulates the Performance and Longevity of Defect Passivation for Metal Halide Perovskite Solar Cells
Yepin Zhao,Pengchen Zhu,Shu Huang,Shaun Tan,Minhuan Wang,Rui Wang,Jingjing Xue,Tae Hee Han,Sung-Joon Lee,Anni Zhang,Tianyi Huang,Pei Cheng,Dong Meng,Jin-Wook Lee,Jaime Marian,Jia Zhu,Yang Yang +16 more
TL;DR: It is unraveled that the passivation agents with a stronger interaction energy are advantageous not only for effective defect passivation but also to suppress defect migration.
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