Phase Segregation Dynamics in Mixed-Halide Perovskites Revealed by Plunge-Freeze Cryogenic Electron Microscopy
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arXiv
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| Main Authors: | , , , , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866912159916621824 |
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| author | Fan, Qingyuan Cui, Yi Li, Yanbin Vigil, Julian A. Jiang, Zhiqiao Nandi, Partha Colby, Robert Zhang, Chensong Cui, Yi Karunadasa, Hemamala I. Lindenberg, Aaron M. |
| author_facet | Fan, Qingyuan Cui, Yi Li, Yanbin Vigil, Julian A. Jiang, Zhiqiao Nandi, Partha Colby, Robert Zhang, Chensong Cui, Yi Karunadasa, Hemamala I. Lindenberg, Aaron M. |
| contents | Mixed-halide lead perovskites, with photoexcited charge-carrier properties suitable for high-efficiency photovoltaics, hold significant promise for high-efficiency tandem solar cells. However, phase segregation under illumination, where an iodide-rich phase forms carrier trap states, remains a barrier to applications. This study employs plunge-freeze cryogenic electron microscopy to visualize nanoscale phase segregation dynamics in CsPb(Br,I) films. By rapidly freezing the illuminated samples, we preserve transient photoexcited ion distributions for high-resolution structural and compositional analysis at the nanoscale. Cryogenic scanning transmission electron microscopy techniques (EELS, 4D-STEM) captured the dynamics of photo-induced iodine migration from grain boundaries to centers, identified the buildup of anisotropic strain, and captured the heterogeneous evolution of this process within a single grain. These findings provide new insights into microscopic phase segregation mechanisms and their dynamics, enhancing our understanding of mixed-halide perovskite photostability. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2412_13004 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Phase Segregation Dynamics in Mixed-Halide Perovskites Revealed by Plunge-Freeze Cryogenic Electron Microscopy Fan, Qingyuan Cui, Yi Li, Yanbin Vigil, Julian A. Jiang, Zhiqiao Nandi, Partha Colby, Robert Zhang, Chensong Cui, Yi Karunadasa, Hemamala I. Lindenberg, Aaron M. Materials Science Applied Physics Mixed-halide lead perovskites, with photoexcited charge-carrier properties suitable for high-efficiency photovoltaics, hold significant promise for high-efficiency tandem solar cells. However, phase segregation under illumination, where an iodide-rich phase forms carrier trap states, remains a barrier to applications. This study employs plunge-freeze cryogenic electron microscopy to visualize nanoscale phase segregation dynamics in CsPb(Br,I) films. By rapidly freezing the illuminated samples, we preserve transient photoexcited ion distributions for high-resolution structural and compositional analysis at the nanoscale. Cryogenic scanning transmission electron microscopy techniques (EELS, 4D-STEM) captured the dynamics of photo-induced iodine migration from grain boundaries to centers, identified the buildup of anisotropic strain, and captured the heterogeneous evolution of this process within a single grain. These findings provide new insights into microscopic phase segregation mechanisms and their dynamics, enhancing our understanding of mixed-halide perovskite photostability. |
| title | Phase Segregation Dynamics in Mixed-Halide Perovskites Revealed by Plunge-Freeze Cryogenic Electron Microscopy |
| topic | Materials Science Applied Physics |
| url | https://arxiv.org/abs/2412.13004 |