Intrinsic exciton transport and recombination in single-crystal lead bromide perovskite
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| Main Authors: | , , , , , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866911222282059776 |
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| author | Bi, Zhixuan Bai, Yunfei Shi, Ying Sun, Tao Wu, Heng Zhang, Haochen Cui, Yuhang Zhu, Danlei Wang, Yubin Lin, Miao-Ling Wang, Yaxian Ma, Dongxin Tan, Ping-Heng Meng, Sheng Xiong, Qihua Yang, Luyi |
| author_facet | Bi, Zhixuan Bai, Yunfei Shi, Ying Sun, Tao Wu, Heng Zhang, Haochen Cui, Yuhang Zhu, Danlei Wang, Yubin Lin, Miao-Ling Wang, Yaxian Ma, Dongxin Tan, Ping-Heng Meng, Sheng Xiong, Qihua Yang, Luyi |
| contents | Photogenerated carrier transport and recombination in metal halide perovskites are critical to device performance. Despite considerable efforts, sample quality issues and measurement techniques have limited the access to their intrinsic physics. Here, by utilizing high-purity CsPbBr3 single crystals and contact-free transient grating spectroscopy, we directly monitor exciton diffusive transport from 26 to 300 K. As the temperature (T) increases, the carrier mobility (μ) decreases rapidly below 100 K wtih a μ~T^{-3.0} scaling, and then follows a more gradual μ~T^{-1.7} trend at higher temperatures. First-principles calculations perfectly reproduce this experimental trend and reveal that optical phonon scattering governs carrier mobility shifts over the entire temperature range, with a single longitudinal optical mode dominating room-temperature transport. Time-resolved photoluminescence further identifies a substantial increase in exciton radiative lifetime with temperature, attributed to increased exciton population in momentum-dark states caused by phonon scattering. Our findings unambiguously resolve previous theory-experiment discrepancies, providing benchmarks for future optoelectronic design. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_01813 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Intrinsic exciton transport and recombination in single-crystal lead bromide perovskite Bi, Zhixuan Bai, Yunfei Shi, Ying Sun, Tao Wu, Heng Zhang, Haochen Cui, Yuhang Zhu, Danlei Wang, Yubin Lin, Miao-Ling Wang, Yaxian Ma, Dongxin Tan, Ping-Heng Meng, Sheng Xiong, Qihua Yang, Luyi Materials Science Photogenerated carrier transport and recombination in metal halide perovskites are critical to device performance. Despite considerable efforts, sample quality issues and measurement techniques have limited the access to their intrinsic physics. Here, by utilizing high-purity CsPbBr3 single crystals and contact-free transient grating spectroscopy, we directly monitor exciton diffusive transport from 26 to 300 K. As the temperature (T) increases, the carrier mobility (μ) decreases rapidly below 100 K wtih a μ~T^{-3.0} scaling, and then follows a more gradual μ~T^{-1.7} trend at higher temperatures. First-principles calculations perfectly reproduce this experimental trend and reveal that optical phonon scattering governs carrier mobility shifts over the entire temperature range, with a single longitudinal optical mode dominating room-temperature transport. Time-resolved photoluminescence further identifies a substantial increase in exciton radiative lifetime with temperature, attributed to increased exciton population in momentum-dark states caused by phonon scattering. Our findings unambiguously resolve previous theory-experiment discrepancies, providing benchmarks for future optoelectronic design. |
| title | Intrinsic exciton transport and recombination in single-crystal lead bromide perovskite |
| topic | Materials Science |
| url | https://arxiv.org/abs/2503.01813 |