Static Rashba Effect by Surface Reconstruction and Photon Recycling in the Dynamic Indirect Gap of APbBr 3 (A = Cs, CH 3 NH 3 ) Single Crystals

Recently, halide perovskites have gained significant attention from the perspective of efficient spintronics owing to the Rashba effect. This effect occurs as a consequence of strong spin-orbit coupling under a noncentrosymmetric environment, which can be dynamic and/or static. However, there exist...

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Bibliographic Details
Published in:Journal of the American Chemical Society 2020-12, Vol.142 (50), p.21059-21067
Main Authors: Ryu, Hongsun, Park, Dae Young, McCall, Kyle M, Byun, Hye Ryung, Lee, Yongjun, Kim, Tae Jung, Jeong, Mun Seok, Kim, Jeongyong, Kanatzidis, Mercouri G, Jang, Joon I
Format: Article
Language:English
Subjects:
Chemistry
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Summary:Recently, halide perovskites have gained significant attention from the perspective of efficient spintronics owing to the Rashba effect. This effect occurs as a consequence of strong spin-orbit coupling under a noncentrosymmetric environment, which can be dynamic and/or static. However, there exist intense debates on the origin of broken inversion symmetry since the halide perovskites typically crystallize into a centrosymmetric structure. In order to clarify the issue, we examine both dynamic and static effects in the all-inorganic CsPbBr and organic-inorganic CH NH PbBr (MAPbBr ) perovskite single crystals by employing temperature- and polarization-dependent photoluminescence excitation spectroscopy. The perovskite single crystals manifest the dynamic effect by photon recycling in the indirect Rashba gap, causing dual peaks in the photoluminescence. However, the effect vanishes in CsPbBr at low temperatures (
ISSN:0002-7863
1520-5126
DOI:10.1021/jacs.0c09132