Universität zu Köln

Meier, Tobias, Gujar, Tanaji P., Schoenleber, Andreas, Olthof, Selina, Meerholz, Klaus ORCID: 0000-0001-7450-4672, van Smaalen, Sander ORCID: 0000-0001-9645-8240, Panzer, Fabian ORCID: 0000-0002-2191-9011, Thelakkat, Mukundan ORCID: 0000-0001-8675-1398 and Koehler, Anna (2018). Impact of excess PbI2 on the structure and the temperature dependent optical properties of methylammonium lead iodide perovskites. J. Mater. Chem. C, 6 (28). S. 7512 - 7520. CAMBRIDGE: ROYAL SOC CHEMISTRY. ISSN 2050-7534

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Abstract

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 (MAPbI(3)). 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 MAPbI(3). 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.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Meier, Tobias UNSPECIFIED UNSPECIFIED UNSPECIFIED Gujar, Tanaji P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Schoenleber, Andreas UNSPECIFIED UNSPECIFIED UNSPECIFIED Olthof, Selina UNSPECIFIED UNSPECIFIED UNSPECIFIED Meerholz, Klaus UNSPECIFIED orcid.org/0000-0001-7450-4672 UNSPECIFIED van Smaalen, Sander UNSPECIFIED orcid.org/0000-0001-9645-8240 UNSPECIFIED Panzer, Fabian UNSPECIFIED orcid.org/0000-0002-2191-9011 UNSPECIFIED Thelakkat, Mukundan UNSPECIFIED orcid.org/0000-0001-8675-1398 UNSPECIFIED Koehler, Anna UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-179414
DOI:	10.1039/c8tc02237b
Journal or Publication Title:	J. Mater. Chem. C
Volume:	6
Number:	28
Page Range:	S. 7512 - 7520
Date:	2018
Publisher:	ROYAL SOC CHEMISTRY
Place of Publication:	CAMBRIDGE
ISSN:	2050-7534
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Chemistry > Institute of Physical Chemistry
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language EXCITON BINDING-ENERGY; SOLAR-CELLS; EFFECTIVE MASSES; VIBRATIONAL PROPERTIES; TRIIODIDE PEROVSKITE; ELECTRONIC-STRUCTURE; CH3NH3PBI3; HALIDE; SPECTROSCOPY; STABILITY Multiple languages Materials Science, Multidisciplinary; Physics, Applied Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/17941