Prolonged Phase Segregation of Mixed-Halide Perovskite Nanocrystals in the Dark
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arXiv
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| Autores principales: | , , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2024
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| _version_ | 1866911946825007104 |
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| author | Ma, Xueying Ye, Yuhui Xiao, Yang Feng, Shengnan Zhang, Chunfeng Xia, Keyu Hu, Fengrui Xiao, Min Wang, Xiaoyong |
| author_facet | Ma, Xueying Ye, Yuhui Xiao, Yang Feng, Shengnan Zhang, Chunfeng Xia, Keyu Hu, Fengrui Xiao, Min Wang, Xiaoyong |
| contents | A critical issue hindering the potential applications of semiconductor mixed-halide perovskites is the phase segregation effect, wherein localized regions enriched with one type of halide anions would be formed upon continuous photogeneration of the excited-state charge carriers. These unexpected phases are capable of remixing again in the dark under the entropic driving force, the process of which are now being exclusively studied after mixed-halide perovskites have arrived at the final stage of complete phase segregation. Here we show that after the removal of laser excitation from a solid film of mixed-halide perovskite nanocrystals with partial phase segregation, the iodide- and bromide-rich regions can continuously grow in the dark for a prolonged time period of several minutes. We propose that this dark phase segregation is sustained by the local electric fields associated with the surface-trapped charge carriers, whose slow dissipation out of mixed-halide perovskite nanocrystals causes a delayed occurrence of the reversal phase remixing process. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_04984 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Prolonged Phase Segregation of Mixed-Halide Perovskite Nanocrystals in the Dark Ma, Xueying Ye, Yuhui Xiao, Yang Feng, Shengnan Zhang, Chunfeng Xia, Keyu Hu, Fengrui Xiao, Min Wang, Xiaoyong Materials Science Mesoscale and Nanoscale Physics A critical issue hindering the potential applications of semiconductor mixed-halide perovskites is the phase segregation effect, wherein localized regions enriched with one type of halide anions would be formed upon continuous photogeneration of the excited-state charge carriers. These unexpected phases are capable of remixing again in the dark under the entropic driving force, the process of which are now being exclusively studied after mixed-halide perovskites have arrived at the final stage of complete phase segregation. Here we show that after the removal of laser excitation from a solid film of mixed-halide perovskite nanocrystals with partial phase segregation, the iodide- and bromide-rich regions can continuously grow in the dark for a prolonged time period of several minutes. We propose that this dark phase segregation is sustained by the local electric fields associated with the surface-trapped charge carriers, whose slow dissipation out of mixed-halide perovskite nanocrystals causes a delayed occurrence of the reversal phase remixing process. |
| title | Prolonged Phase Segregation of Mixed-Halide Perovskite Nanocrystals in the Dark |
| topic | Materials Science Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2407.04984 |