Anisotropic Electron-Phonon Interactions in 2D Lead-Halide Perovskites

Overview

Journal Nano Lett

Publisher American Chemical Society

Specialty Biotechnology

Date 2024 Jul 8

PMID 38976834

Authors

Jaco J Geuchies

Johan Klarbring

Lucia Di Virgilio

Shuai Fu

Sheng Qu

Guangyu Liu

Hai Wang

Jarvist M Frost

Aron Walsh

Mischa Bonn

Heejae Kim

Affiliations

Soon will be listed here.

Abstract

Two-dimensional (2D) hybrid organic-inorganic metal halide perovskites offer enhanced stability for perovskite-based applications. Their crystal structure's soft and ionic nature gives rise to strong interaction between charge carriers and ionic rearrangements. Here, we investigate the interaction of photogenerated electrons and ionic polarizations in single-crystal 2D perovskite butylammonium lead iodide (BAPI), varying the inorganic lamellae thickness in the 2D single crystals. We determine the directionality of the transition dipole moments (TDMs) of the relevant phonon modes (in the 0.3-3 THz range) by the angle- and polarization-dependent THz transmission measurements. We find a clear anisotropy of the in-plane photoconductivity, with a ∼10% reduction along the axis parallel with the transition dipole moment of the most strongly coupled phonon. Detailed calculations, based on Feynman polaron theory, indicate that the anisotropy originates from directional electron-phonon interactions.

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