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

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 (k2≈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.

Chiral 3D Perovskite Formation Induced by Chiral Templates

“…Chiral materials have garnered substantial attention for their diverse applications in fields ranging from pharmaceuticals and chiral catalysis to chiral photonics and electronics. − In recent years, perovskite materials have emerged as promising candidates in optoelectronic devices due to their exceptional optoelectronic properties, including high absorption coefficients, superior charge carrier mobility, and extended charge carrier diffusion lengths. , The integration of chirality into perovskite materials holds great promise for enhancing their performance in optoelectronic devices with spintronic applications. While chiral low-dimensional perovskites have been widely explored for their potential in various applications such as ferroelectricity, − nonlinear optics, − circularly polarized luminescence, − and chiral detection, , it is important to note that most of these chiral perovskites to date have employed large chiral cations as spacer ligands.…”