Universität zu Köln

Olthof, Selina ORCID: 0000-0002-8871-1549 and Meerholz, Klaus ORCID: 0000-0001-7450-4672 (2017). Substrate-dependent electronic structure and film formation of MAPbI(3) perovskites. Sci Rep, 7. LONDON: NATURE PUBLISHING GROUP. ISSN 2045-2322

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Abstract

We present investigations on the interface formation between the hybrid perovskite MAPbI(3) and various substrates, covering a wide range of work functions. The perovskite films are incrementally evaporated in situ while the electronic structure is evaluated using photoelectron spectroscopy. Our results show that there is an induction period in the growth of the perovskite during which volatile compounds are formed, catalyzed by the substrate. The duration of the induction period depends strongly on the nature of the substrate material, and it can take up to 20-30 nm of formal precursor deposition before the surface is passivated and the perovskite film starts forming. The stoichiometry of the 2-3 nm thin passivation layer deviates from the expected perovskite stoichiometry, being rich in decomposition products of the organic cation. During the regular growth of the perovskite, our measurements show a deviation from the commonly assumed flat band condition, i.e., dipole formation and band bending dominate the interface. Overall, the nature of the substrate not only changes the energetic alignment of the perovskite, it can introduce gap states and influence the film formation and morphology. The possible impact on device performance is discussed.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Olthof, Selina UNSPECIFIED orcid.org/0000-0002-8871-1549 UNSPECIFIED Meerholz, Klaus UNSPECIFIED orcid.org/0000-0001-7450-4672 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-242520
DOI:	10.1038/srep40267
Journal or Publication Title:	Sci Rep
Volume:	7
Date:	2017
Publisher:	NATURE PUBLISHING GROUP
Place of Publication:	LONDON
ISSN:	2045-2322
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; CARRIER DIFFUSION; SINGLE-CRYSTALS; WORK FUNCTION; CH3NH3PBI3; INTERFACE; SURFACE; ORIGIN; TIN; DECOMPOSITION Multiple languages Multidisciplinary Sciences Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/24252