Strongly Anharmonic Octahedral Tilting in Two-Dimensional Hybrid Halide Perovskites.

ABSTRACT: Recent investigations of two-dimensional (2D) hybrid organic-inorganic halide perovskites (HHPs) indicate that their optical and electronic properties are dominated by strong coupling to thermal fluctuations. While the optical properties of 2D-HHPs have been extensively studied, a comprehensive understanding of electron-phonon interactions is limited because little is known about their structural dynamics. This is partially because the unit cells of 2D-HHPs contain many atoms. Therefore, the thermal fluctuations are complex and difficult to elucidate in detail. To overcome this challenge, we use polarization-orientation Raman spectroscopy and ab initio calculations to compare the structural dynamics of the prototypical 2D-HHPs [(BA)₂PbI₄ and (PhE)₂Pb

SUBMITTER: Menahem M 

PROVIDER: S-EPMC8223479 | biostudies-literature | 2021 Jun

REPOSITORIES: biostudies-literature