Edge States in 2D A<sub>2</sub>PbBr<sub>4</sub> Hybrid Perovskites Enabled by Local Structural Reorganization
The edge states (ES) in two-dimensional (2D) hybrid lead halide perovskites (LHPs) exhibit distinct electronic characteristics, including lower energy and longer lifetimes compared to the interior states (IS). Though the ES of these 2D LHPs show prospect of facilitating photovoltaic and optoelectronic effects, the underlying mechanism remains elusive. Here, the occurrence of ES in a family of 2D A<sub>2</sub>PbBr<sub>4</sub> (A = organic amine cation) LHPs is attributed to the Rashba/Dresselhaus (RD) spin splitting induced by local structural reorganization on the crystal edge. The experimental and theoretical characterizations reveal that the local structure on the crystal edge is significantly strained, which leads to considerable out-of-plane distortion of adjacent PbBr<sub>6</sub> octahedra, local loss of inversion symmetry and therefore spin-splitting energy required for the formation of ES. This findings contribute fresh perspectives to the fundamental comprehension of the RD effect, extending the boundaries of spintronics and opening promising pathways for the conceptualization and refinement of devices centered on ES.
Authors
- Jacky Even (ORCID: https://orcid.org/0000-0002-4607-3390)
- Ilya Kupenko (ORCID: https://orcid.org/0000-0003-3783-8360)
- Xian‐He Bu (ORCID: https://orcid.org/0000-0002-2646-7974)
- Michael Hanfland (ORCID: https://orcid.org/0000-0002-8904-5461)
- Xiang Wu (ORCID: https://orcid.org/0000-0002-3249-168X)
- Wei Li (ORCID: https://orcid.org/0000-0002-5277-6850)
- Konstantin V. Glazyrin (ORCID: https://orcid.org/0000-0002-5296-9265)
- Xiang Li (ORCID: https://orcid.org/0000-0002-8400-2542)
- Zhigang Li (ORCID: https://orcid.org/0000-0001-7164-1049)
- Dong Xiaohui
- Ziying Li (ORCID: https://orcid.org/0000-0002-6443-492X)
- Haipeng Song (ORCID: https://orcid.org/0000-0003-4200-845X)
Institutions
- Centre National de la Recherche Scientifique (FR)
- Nankai University (CN)
- University of Münster (DE)
- Deutsches Elektronen-Synchrotron DESY (DE)
- European Synchrotron Radiation Facility (FR)
- Institut National des Sciences Appliquées de Rennes (FR)
- China University of Geosciences (CN)
- Fonctions Optiques pour les Technologies de l’information (FR)
- Université de Rennes (FR)
Publication Details
- Journal
- Advanced Materials
- Published
- 2025-05-29
- DOI
- https://doi.org/10.1002/adma.202419606
- Citations
- 3
- Primary Topic
- Perovskite Materials and Applications
- Type
- article
- Field-Weighted Citation Impact
- 2.19
Funders
- National Natural Science Foundation of China
- Natural Science Foundation of Tianjin City
- National Key Research and Development Program of China