Regensburg 2019 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 45: HL Posters III

HL 45.11: Poster

Donnerstag, 4. April 2019, 18:30–21:00, Poster E

Raman spectroscopy of hybrid perovskites and perovskite-like structures — •Sebastian Lotter1, Felix Kampmann1,2, Daniel Niesner1, Mykhailo Sytnyk3, Ievgen Levchuk3, Wolfgang Heiß3, Christoph J. Brabec3, and Janina Maultzsch11Department of Physics, Friedrich-Alexander-Universität Erlangen-Nürnberg, Germany — 2Institut für Festkörperphysik, Technische Universität Berlin — 3Department of Materials Science and Engineering, Friedrich-Alexander-Universität Erlangen-Nürnberg, Germany

In recent years organic-inorganic hybrid perovskites have been subject to intense research efforts in physics and materials science, due to their promising efficiency in solar cell applications [1]. Providing an organic cation and an inorganic frame, these materials have a rich vibrational spectrum. Understanding the phonon modes of these hybrid crystals and their effect on the electronic properties is key to future design of perovskites materials for applications.

In this work we present Raman scattering and photoluminescence (PL) spectra of different organic-inorganic perovskites, such as MAPbBr3 and of perovskite-like ferroelectrics. The experiments are performed at different temperature regimes between 5K and 300K and at different excitation wavelengths. Furthermore, we compare Raman spectra and PL between bulk crystals and thin-film samples.

[1] Y. Hou et al., A generic interface to reduce the efficiency-stability-cost gap of perovskite solar cells, Science 358, 1192 (2017).

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