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Double peak emission in lead halide perovskites by self-absorption

Title data

Schötz, Konstantin ; Askar, Abdelrahman M. ; Peng, Wei ; Seeberger, Dominik ; Gujar, Tanaji P. ; Thelakkat, Mukundan ; Köhler, Anna ; Hüttner, Sven ; Bakr, Osman M. ; Shankar, Karthik ; Panzer, Fabian:
Double peak emission in lead halide perovskites by self-absorption.
In: Journal of Materials Chemistry C. (2020) .
ISSN 2050-7534
DOI: https://doi.org/10.1039/C9TC06251C

Abstract in another language

Despite the rapidly increasing efficiencies of perovskite solar cells, the optoelectronic properties of this material class are not completely understood. Especially when measured photoluminescence (PL) spectra consist of multiple peaks, their origin is still debated. In this work, we investigate in detail double peak PL spectra of halide perovskite thin films and single crystals with different material compositions. By different optical spectroscopic approaches and quantitative models, we demonstrate that the additional PL peak results from an extensive self-absorption effect, whose impact is intensified by strong internal reflections. This self-absorption accounts for the unusual temperature dependence of the additional PL peak and it implies that absorption until far into the perovskite's Urbach tail is important. The internal reflections entail that even for thin films self-absorption can have a significant contribution to the PL spectrum. Our results allow for a clear assignment of the PL peaks by differentiating between optical effects and electronic transitions, which is a necessary requirement for understanding the optoelectronic properties of halide perovskites.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Experimental Physics II - Optoelectronics of Soft Matter
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Experimental Physics II - Optoelectronics of Soft Matter > Chair Experimental Physics II - Optoelectronics of Soft Matter - Univ.-Prof. Dr. Anna Köhler
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Professor Applied Functional Polymers > Professor Applied Functional Polymers - Univ.-Prof. Dr. Mukundan Thelakkat
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 530 Physics
Date Deposited: 22 Jan 2020 06:40
Last Modified: 22 Jan 2020 06:40
URI: https://eref.uni-bayreuth.de/id/eprint/54184