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

^aSoft Matter Optoelectronics, University of Bayreuth, Germany, Bayreuth, Germany

^bDepartment of Electrical and Computer Engineering, University of Alberta, Canada

^cKing Abdullah University of Science and Technology (KAUST) - Saudi Arabia, 4700 King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia

^dOrganic and Hybrid Electronics, Macromolecular Chemistry I, University of Bayreuth, Germany, Germany

^eApplied Functional Polymers, University of Bayreuth, DE, Germany

^fBayreuth Institute of Macromolecular Research (BIMF), University of Bayreuth, Germany, Bayreuth, Germany

Materials for Sustainable Development Conference (MATSUS)
Proceedings of nanoGe Fall Meeting19 (NFM19)

#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.

nanoGe is a prestigious brand of successful science conferences that are developed along the year in different areas of the world since 2009. Our worldwide conferences cover cutting-edge materials topics like perovskite solar cells, photovoltaics, optoelectronics, solar fuel conversion, surface science, catalysis and two-dimensional materials, among many others.

MATSUS

Previously nanoGe Spring Meeting (NSM) and nanoGe Fall Meeting (NFM), MATSUS is a multiple symposia conference focused on a broad set of topics of advanced materials preparation, their fundamental properties, and their applications, in fields such as renewable energy, photovoltaics, lighting, semiconductor quantum dots, 2-D materials synthesis, charge carriers dynamics, microscopy and spectroscopy semiconductors fundamentals, etc.

International Conference on Hybrid and Organic Photovoltaics

International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.

Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics

The main topics of the Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP) are discussed every year in Asia-Pacific for gathering the recent advances in the fields of material preparation, modeling and fabrication of perovskite and hybrid and organic materials. Photovoltaic devices are analyzed from fundamental physics and materials properties to a broad set of applications. The conference also covers the developments of perovskite optoelectronics, including light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.

International Conference on Perovskite Thin Film Photovoltaics Perovskite Photonics and Optoelectronics

The International Conference on Perovskite Thin Film Photovoltaics Perovskite Photonics and Optoelectronics (NIPHO) is the best place to hear the latest developments in perovskite solar cells as well as on recent advances in the fields of perovskite light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.