Understanding double peak emission in lead halide perovskites
Konstantin Schötz a, Abdelrahman Askar b, Wei Peng c, Dominik Seeberger d, Tanaji P. Guijar e, Mukundan Thelakkat e, Anna Köhler a f, Sven Hüttner d, Osman M. Bakr c, Karthik Shankar b, Fabian Panzer a
a Soft Matter Optoelectronics, University of Bayreuth, Germany, Bayreuth, Germany
b Department of Electrical and Computer Engineering, University of Alberta, Canada
c King Abdullah University of Science and Technology (KAUST) - Saudi Arabia, 4700 King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia
d Organic and Hybrid Electronics, Macromolecular Chemistry I, University of Bayreuth, Germany
e Applied Functional Polymers, University of Bayreuth, Germany
f Bayreuth Institute of Macromolecular Research (BIMF), University of Bayreuth, Germany, Bayreuth, Germany
Proceedings of nanoGe Fall Meeting19 (NGFM19)
#PERFuDe19. Halide perovskites: when theory meets experiment from fundamentals to devices
Berlin, Germany, 2019 November 3rd - 8th
Organizers: Claudine Katan, Wolfgang Tress and Simone Meloni
Poster, Konstantin Schötz, 327
Publication date: 18th July 2019

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 photoluminescence. 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 photon recycling, self-absorption, excited state diffusion and 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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