SKM 2023 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 7: Poster I

HL 7.34: Poster

Montag, 27. März 2023, 13:00–15:00, P2/EG

Phase diagram of two-dimensional ferroelectric large polarons — •Florian Kluibenschedl, Georgios Koutentakis, and Mikhail Lemeshko — Institute of Science and Technology Austria (ISTA), Am Campus 1, 3400 Klosterneuburg, Austria

We present a minimal, coarse-grained, two-dimensional model of charge transport in lead halide perovskites, which provides an intuitive explanation for the recently proposed formation of ferroelectric large polarons [1]. The phase-diagram analysis reveals the presence of three phases characterized by the distinct order of the molecular dipole moments which is strongly dependent on the tunneling anisotropy of the carriers. The most striking outcome is the formation of ferroelectric domains that amplify the anisotropy in the carrier tunneling dynamics which has been argued to lead to improved optoelectronic properties. These results provide the groundwork for realizing a top-down approach for understanding the complex carrier dynamics in hybrid organic-inorganic perovskites.

[1] F. Wang, Y. Fu, M. E. Ziffer, Y. Dai, S. F. Maehrlein, and X.-Y. Zhu. Journal of the American Chemical Society 2021 143 (1), 5-16. DOI: 10.1021/jacs.0c10943