Composition gradient-enabled circular photogalvanic effect in inogranic halide perovskites

Inversion symmetry breaking could lead to the creation of a Rashba–Dresselhauls magnetic field, which plays the key role in spintronic devices. In this work, we propose and develop a composition gradient engineering approach that breaks inversion symmetry into inorganic halide perovskites with stron...

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Bibliographic Details
Published in:	Applied physics letters Vol. 120; no. 21
Main Authors:	Jia, Ru, Jiang, Jie, Zhang, Lifu, Hu, Yang, Pendse, Saloni, Guo, Yuwei, Shi, Jian
Format:	Journal Article
Language:	English
Published:	Melville American Institute of Physics 23-05-2022
Subjects:	Applied physics Broken symmetry Chemical vapor deposition Composition Data processing Optoelectronics Perovskites Photoluminescence Spin-orbit interactions Symmetry
Online Access:	Get full text
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Summary:	Inversion symmetry breaking could lead to the creation of a Rashba–Dresselhauls magnetic field, which plays the key role in spintronic devices. In this work, we propose and develop a composition gradient engineering approach that breaks inversion symmetry into inorganic halide perovskites with strong spin–orbit coupling. We synthesize epitaxial CsPbBrxCl(3−x) with Br/Cl composition gradient by a two-step chemical vapor deposition approach. Through optoelectronic measurements, we show the presence of circular photogalvanic effects (CPGEs), evidencing a Rashba-like spin polarized band structure. By spatially resolved photoluminescence spectra, we find that the observed CPGE is likely a cumulative result of inversion symmetry-broken interfaces featured by abrupt and stepwise composition gradient between the pristine and separated daughter phases. Our work suggests an avenue in engineering the spintronic property of halide perovskites for information processing.
ISSN:	0003-6951 1077-3118
DOI:	10.1063/5.0083187