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1 August 2021 Bright and dark excitons in two-dimensional perovskite semiconductors
Thu Ha Do, Andres Granados del Aguila, Dong Zhang, Jun Xing, Sheng Liu, Mikhail Prosnikov, Weibo Gao, Kai Chang, Peter Christianen, Qihua Xiong
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Proceedings Volume 11809, Organic, Hybrid, and Perovskite Photovoltaics XXII; 1180914 (2021) https://doi.org/10.1117/12.2593921
Event: SPIE Organic Photonics + Electronics, 2021, San Diego, California, United States
Abstract
Lead halide perovskites are known for their great potential in high-performance light-harvesting devices. We investigated the exciton recombination properties of 2D perovskites. We resolved two bright (optically allowed) exciton doublets and a dark (optically forbidden) exciton. Particularly, under the inherently strong electron-hole exchange interaction, each bright exciton doublet is split into two orthogonally orienting dipoles with large energy splitting of 2 meV, which is the largest experimental values in two-dimensional semiconductors. Furthermore, we observed an efficient transfer of oscillator strengths from the bright excitons to a dark exciton, which originates from strong spin-mixing between bright and dark excitons induced by external magnetic fields, and the optical emission from the dark exciton is brightened. Our results reveal that the physics on exciton recombination in 2D perovskites is rich, while the optical emission properties can be manipulated by external fields
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Thu Ha Do, Andres Granados del Aguila, Dong Zhang, Jun Xing, Sheng Liu, Mikhail Prosnikov, Weibo Gao, Kai Chang, Peter Christianen, and Qihua Xiong "Bright and dark excitons in two-dimensional perovskite semiconductors", Proc. SPIE 11809, Organic, Hybrid, and Perovskite Photovoltaics XXII, 1180914 (1 August 2021); https://doi.org/10.1117/12.2593921
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KEYWORDS
Excitons
Perovskite
Semiconductors
Magnetism
Magnetic semiconductors
Oscillators
Lead
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