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SYCS: Symposium Multidimensional coherent spectroscopy of functional nanostructures

SYCS 1: Symposium: Multidimensional coherent spectroscopy of functional nanostructures

SYCS 1.5: Hauptvortrag

Dienstag, 28. September 2021, 12:15–12:45, Audimax 1

Low-frequency phonons affect charge carrier dynamics in hybrid perovskites — •Mischa Bonn — Max Planck Institute for Polymer Research

We study the effect of the gigahertz dielectric response of organic cations and the terahertz phonon response of the inorganic sublattice on the properties, in particular of charge carriers, of hybrid organic-inorganic perovskite materials. We show that electron-phonon coupling is efficient, as evidenced by the timescale of coupling of nascent charge carriers to low-frequency phonon modes occurring on the timescale of the oscillation time of the phonon. We reveal direct coupling between the phonon mode and the bandgap, explaining the anomalous increase of the bandgap of hybrid perovskites with increasing temperature. We also show that there is remarkably efficient coupling between the organic and inorganic sublattices in the perovskite, despite the lack of covalent bonds between the two sublattices.