Ziegler, Jonas D. and Zipfel, Jonas and Meisinger, Barbara and Menahem, Matan and Zhu, Xiangzhou and Taniguchi, Takashi and Watanabe, Kenji and Yaffe, Omer and Egger, David A. and Chernikov, Alexey (2020) Fast and Anomalous Exciton Diffusion in Two-Dimensional Hybrid Perovskites. NANO LETTERS, 20 (9). pp. 6674-6681. ISSN 1530-6984, 1530-6992
Full text not available from this repository. (Request a copy)Abstract
Two-dimensional hybrid perovskites are currently in the spotlight of condensed matter and nanotechnology research due to their intriguing optoelectronic and vibrational properties with emerging potential for light-harvesting and light-emitting applications. While it is known that these natural quantum wells host tightly bound excitons, the mobilities of these fundamental optical excitations at the heart of the optoelectronic applications are barely explored. Here, we directly monitor the diffusion of excitons through ultrafast emission microscopy from liquid helium to room temperature in hBN-encapsulated two-dimensional hybrid perovskites. We find very fast diffusion with characteristic hallmarks of free exciton propagation for all temperatures above 50 K. In the cryogenic regime, we observe nonlinear, anomalous behavior with an exceptionally rapid expansion of the exciton cloud followed by a very slow and even negative effective diffusion. We discuss our findings in view of efficient exciton-phonon coupling, highlighting two-dimensional hybrids as promising platforms for basic research and optoelectronic applications.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | DYNAMICS; 2D perovskites; excitons; diffusion; exciton-phonon interaction |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics Physics > Institute of Experimental and Applied Physics > Junior Research Group Alexey Chernikov |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 12 Mar 2021 07:21 |
| Last Modified: | 12 Mar 2021 07:21 |
| URI: | https://pred.uni-regensburg.de/id/eprint/43819 |
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