Universität zu Köln

Emara, Jennifer, Schnier, Tobias, Pourdavoud, Neda, Riedl, Thomas ORCID: 0000-0003-1084-316X, Meerholz, Klaus ORCID: 0000-0001-7450-4672 and Olthof, Selina ORCID: 0000-0002-8871-1549 (2016). Impact of Film Stoichiometry on the Ionization Energy and Electronic Structure of CH3NH3PbI3 Perovskites. Adv. Mater., 28 (3). S. 553 - 561. WEINHEIM: WILEY-V C H VERLAG GMBH. ISSN 1521-4095

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Abstract

The electronic structure of a large sample set of CH3NH3PbI3-based per-ovskites is studied. Combined investigations by UV/X-ray photoelectron spectroscopy and X-ray diffraction reveal that interstitials present in the film lead to changes in the occupied density of states close to the valence band, which in turn influences the performance of solar cells. Changes in elemental composition tune the ionization energy of the perovskite film by almost 1 eV with-out introducing significant amounts of gap states.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Emara, Jennifer UNSPECIFIED UNSPECIFIED UNSPECIFIED Schnier, Tobias UNSPECIFIED UNSPECIFIED UNSPECIFIED Pourdavoud, Neda UNSPECIFIED UNSPECIFIED UNSPECIFIED Riedl, Thomas UNSPECIFIED orcid.org/0000-0003-1084-316X UNSPECIFIED Meerholz, Klaus UNSPECIFIED orcid.org/0000-0001-7450-4672 UNSPECIFIED Olthof, Selina UNSPECIFIED orcid.org/0000-0002-8871-1549 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-287114
DOI:	10.1002/adma.201503406
Journal or Publication Title:	Adv. Mater.
Volume:	28
Number:	3
Page Range:	S. 553 - 561
Date:	2016
Publisher:	WILEY-V C H VERLAG GMBH
Place of Publication:	WEINHEIM
ISSN:	1521-4095
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 HETEROJUNCTION SOLAR-CELLS; LEAD IODIDE PEROVSKITES; HALIDE PEROVSKITES; PERFORMANCE; EFFICIENCY; INTERFACE Multiple languages Chemistry, Multidisciplinary; Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/28711