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Regensburg 2019 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 37: Poster Session III

CPP 37.16: Poster

Mittwoch, 3. April 2019, 11:00–13:00, Poster B1

Unravelling the origin of double peak emission of hybrid perovskites — •Konstantin Schötz1, Abdelraham Askar2, Wei Peng3, Dominik Seeberger1, Tanaji P. Guijar1, Mukundan Thelakkat1, Sven Hüttner1, Osman Bakr3, Karthik Shankar2, Anna Köhler1, and Fabian Panzer11University of Bayreuth, 95440 Bayreuth, Germany — 2University of Alberta, Edmonton, AB T6G 1H9, Canada — 3King Abdullah University of Science and Technology (KAUST), Thuwal23955-6900, Kingdom of Saudi Arabia

The optical properties of hybrid perovskites are known to be sensitively interconnected with their structure, which is soft and thus prone for changes. Double photoluminescence (PL) peaks have been reported at low temperatures, and recently also at room temperature, though there is still no consensus about the origin of this double PL peak structure. Here we show that the occurrence of the additional PL peak is not limited to one specific material composition and that it occurs in single crystals as well as in thin films, rendering it a general phenomenon. We systematically investigate the origin of this additional PL feature by measuring and analyzing temperature-dependent one- and two-photon-induced PL. Together with fluence dependent measurements, optical modelling and systematic surface treatments, we can differentiate the impact of various possible physical and optical effects such as e.g. self-absorption, excited state diffusion or surface states, in order to gain a detailed and elaborated understanding on the occurrence of multiple PL peak phenomena in hybrid perovskites.

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