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Impact of excess PbI₂ on the structure and the temperature dependent optical properties of methylammonium lead iodide perovskites

Title data

Meier, Tobias ; Gujar, Tanaji P. ; Schönleber, Andreas ; Olthof, Selina ; Meerholz, Klaus ; van Smaalen, Sander ; Panzer, Fabian ; Thelakkat, Mukundan ; Köhler, Anna:
Impact of excess PbI₂ on the structure and the temperature dependent optical properties of methylammonium lead iodide perovskites.
In: Journal of Materials Chemistry C. Vol. 6 (2018) Issue 28 . - pp. 7512-7519.
ISSN 2050-7534
DOI: https://doi.org/10.1039/C8TC02237B

Project information

Project financing: Bundesministerium für Bildung und Forschung
Deutsche Forschungsgemeinschaft

Abstract in another language

We investigate the impact of excess PbI2 in the precursor solution on the structural and optical properties of thin films of the model hybrid perovskite methylammonium lead iodide (MAPbI3). We find that excess of PbI2 in the precursor solution results in crystalline PbI2 in the final thin film that is located at the grain boundaries. From UPS we find that this crystalline PbI2 phase has no direct impact on the electronic structure of MAPbI3. In contrast to this, temperature dependent absorption measurements indicate a systematic change in the temperature dependence of the exciton binding energy in the perovskite. We also observe a decrease in the critical temperature and a concomitant smearing out of the tetragonal–orthorhombic phase transition as a function of excess PbI2. Our results thus help to better understand the exact role of PbI2 in the perovskite layer and pave the way for a more tailored design of perovskite solar cells.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties
Faculties > Faculty of Mathematics, Physics und Computer Science
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Lehrstuhl Experimentalphysik II - Optoelektronik weicher Materie
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Lehrstuhl Experimentalphysik II - Optoelektronik weicher Materie > Lehrstuhl Experimentalphysik II - Optoelektronik weicher Materie - Univ.-Prof. Dr. Anna Köhler
Faculties > Faculty of Mathematics, Physics und Computer Science > Group Material Sciences > Chair Crystallography
Faculties > Faculty of Mathematics, Physics und Computer Science > Group Material Sciences
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 530 Physics
Date Deposited: 29 Jun 2018 06:43
Last Modified: 22 Jan 2019 08:07
URI: https://eref.uni-bayreuth.de/id/eprint/44759