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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Caution! Static Supercell Calculations of Defect Migration in Higher Symmetry ABX3 Perovskite Halides May Be Unreliable: A Case Study of Methylammonium Lead Iodide.
TL;DR: In this paper , a robust test is proposed to determine whether static supercell calculations of point-defect processes in ABX3 perovskite systems are reliable, showing that such calculations are unreliable for higher symmetry structures adopted by the material at temperatures relevant to device operation (tetragonal and cubic MAPbI3).
Journal ArticleDOI
Mixed dimensionality of 2D/3D heterojunctions for improving charge transport and long-term stability in high-efficiency 1.63 eV bandgap perovskite solar cells
Jinkun Jiang,Congcong Tian,Zhiang Zhang,Xiao (Xiao) Liu,Xin Wang,Yiting Zheng,Zhanfei Zhang,Luyao Wang,Xueyun Wu,Jianghua Liang,Chun-Chao Chen +10 more
TL;DR: By using R-α-MBA with bromine terminal to develop 2D perovskite, an improved PCE of 21.48% was achieved with a FF of 82.44 as discussed by the authors .
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