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Published October 21, 2021 | Supplemental Material
Journal Article Open

Rashba exciton in a 2D perovskite quantum dot

Abstract

The Rashba effect has been proposed to give rise to a bright exciton ground state in halide perovskite nanocrystals (NCs), resulting in very fast radiative recombination at room temperature and extremely fast radiative recombination at low temperature. In this paper we find the dispersion of the "Rashba exciton", i.e., the exciton whose bulk dispersion reflects large spin–orbit Rashba terms in the conduction and valence bands and thus has minima at non-zero quasi-momenta. Placing Rashba excitonsin quasi-2D cylindrical quantum dots, we calculate size-dependent levels of confined excitons and their oscillator transition strengths. We consider the implications of this model for two-dimensional hybrid organic–inorganic perovskites, discuss generalizations of this model to 3D NCs, and establish criteria under which a bright ground exciton state could be realized.

Additional Information

© The Royal Society of Chemistry 2021. Submitted 28 Jul 2021. Accepted 20 Sep 2021. First published 04 Oct 2021. Al. L. E. and J. L. L. acknowledge support from the US Office of Naval Research and the Laboratory-University Collaboration Initiative (LUCI) program of the DoD Basic Research Office; Theoretical calculations of exciton fine structure, long-range exchange interactions, and oscillator strengths were supported by the Center for Hybrid Organic Inorganic Semiconductors for Energy (CHOISE) an Energy Frontier Research Center funded by the Office of Basic Energy Sciences, Office of Science within the US Department of Energy; M. W. S. acknowledges support from the Naval Research Laboratory Postdoctoral Fellowship through the American Society for Engineering Education. Author contributions. Conceptualization, Al. L. E. and P. C. S.; Methodology, Al. L. E. and P. C. S.; Software, M. W. S. and P. C. S.; Validation, M. W. S., J. L. L., Al. L. E., and P. C. S.; Investigation, M. W. S. and P. C. S.; Writing – Original Draft, M. W. S., Al. L. E., and P. C. S.; Writing – Review & Editing, M. W. S., J. L. L., Al. L. E., and P. C. S.; Visualization, M. W. S. and P. C. S.; Supervision, Al. L. E. and P. C. S.; Funding Acquisition, J. L. L., Al. L. E., and P. C. S. There are no conflicts to declare.

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Additional details

Created:
August 20, 2023
Modified:
October 23, 2023