Rashba Band Splitting and Bulk Photovoltaic Effect Induced by Halogen Bonds in Hybrid Layered Perovskites

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

12 Scopus Citations
View graph of relations

Author(s)

  • Jie Xue
  • Yuling Huang
  • Yang Liu
  • Zhongwei Chen
  • Herman H.-Y. Sung
  • Ian D. Williams
  • Lingling Mao
  • Xihan Chen
  • Haipeng Lu

Related Research Unit(s)

Detail(s)

Original languageEnglish
Article numbere202304486
Journal / PublicationAngewandte Chemie (International Edition)
Volume62
Issue number29
Online published12 Jun 2023
Publication statusPublished - 17 Jul 2023

Abstract

Non-covalent interactions play an essential role in directing the self-assembly of hybrid organic-inorganic crystals. In hybrid halide perovskites, hydrogen bonding has been the paramount non-covalent interaction. Here, we show another non-covalent interaction, namely, the halogen bond interaction, that directs a symmetry-breaking assembly in a new series of two-dimensional (2D) perovskites (ICH2CH2NH3)2(CH3NH3)n-1PbnI3n+1 (n is the layer thickness, n=1-4). Structural analysis shows that the halogen bond strength varies with the layer thickness. For the odd number (n=1, 3) layered perovskites, stronger halogen interaction leads to centrosymmetric structures, whereas for the n=2 layered perovskites, weaker halogen bonds result in non-centrosymmetric structures. Transient reflection spectroscopy shows a suppressed radiative recombination rate (k≈ 0) and prolonged spin lifetime for n=2 structure, suggesting an enhanced Rashba band splitting effect. The structural asymmetry is further confirmed with a reversible bulk photovoltaic effect. Our work provides a new design strategy to enable hybrid perovskites with emerging properties and functionalities associated with structural asymmetry. © 2023 Wiley-VCH GmbH

Research Area(s)

  • Bulk Photovoltaic Effect, Layered Perovskite, Rashba Band Splitting, Structure-Property Relationship, Symmetry Breaking, HALIDE PEROVSKITE, CHARGE-CARRIER, SOLAR-CELLS, ORGANIC CATIONS, HYDROGEN, RECOMBINATION, DYNAMICS, MODULATION, EFFICIENCY, LIFETIME

Citation Format(s)

Rashba Band Splitting and Bulk Photovoltaic Effect Induced by Halogen Bonds in Hybrid Layered Perovskites. / Xue, Jie; Huang, Yuling; Liu, Yang et al.
In: Angewandte Chemie (International Edition), Vol. 62, No. 29, e202304486, 17.07.2023.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review