Universität zu Köln

Hu, Ting, Becker, Tim, Pourdavoud, Neda, Zhao, Jie, Brinkmann, Kai Oliver ORCID: 0000-0002-2124-3904, Heiderhoff, Ralf, Gahlmann, Tobias, Huang, Zengqi, Olthof, Selina ORCID: 0000-0002-8871-1549, Meerholz, Klaus ORCID: 0000-0001-7450-4672, Tobbens, Daniel, Cheng, Baochang, Chen, Yiwang and Riedl, Thomas ORCID: 0000-0003-1084-316X (2017). Indium-Free Perovskite Solar Cells Enabled by Impermeable Tin-Oxide Electron Extraction Layers. Adv. Mater., 29 (27). WEINHEIM: WILEY-V C H VERLAG GMBH. ISSN 1521-4095

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Abstract

Corrosive precursors used for the preparation of organic-inorganic hybrid perovskite photoactive layers prevent the application of ultrathin metal layers as semitransparent bottom electrodes in perovskite solar cells (PVSCs). This study introduces tin-oxide (SnOx) grown by atomic layer deposition (ALD), whose outstanding permeation barrier properties enable the design of an indium-tin-oxide (ITO)-free semitransparent bottom electrode (SnOx/Ag or Cu/SnOx), in which the metal is efficiently protected against corrosion. Simultaneously, SnOx functions as an electron extraction layer. We unravel the spontaneous formation of a PbI2 interfacial layer between SnOx and the CH3NH3PbI3 perovskite. An interface dipole between SnOx and this PbI2 layer is found, which depends on the oxidant (water, ozone, or oxygen plasma) used for the ALD growth of SnOx. An electron extraction barrier between perovskite and PbI2 is identified, which is the lowest in devices based on SnOx grown with ozone. The resulting PVSCs are hysteresis-free with a stable power conversion efficiency (PCE) of 15.3% and a remarkably high open circuit voltage of 1.17 V. The ITO-free analogues still achieve a high PCE of 11%.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Hu, Ting UNSPECIFIED UNSPECIFIED UNSPECIFIED Becker, Tim UNSPECIFIED UNSPECIFIED UNSPECIFIED Pourdavoud, Neda UNSPECIFIED UNSPECIFIED UNSPECIFIED Zhao, Jie UNSPECIFIED UNSPECIFIED UNSPECIFIED Brinkmann, Kai Oliver UNSPECIFIED orcid.org/0000-0002-2124-3904 UNSPECIFIED Heiderhoff, Ralf UNSPECIFIED UNSPECIFIED UNSPECIFIED Gahlmann, Tobias UNSPECIFIED UNSPECIFIED UNSPECIFIED Huang, Zengqi UNSPECIFIED UNSPECIFIED UNSPECIFIED Olthof, Selina UNSPECIFIED orcid.org/0000-0002-8871-1549 UNSPECIFIED Meerholz, Klaus UNSPECIFIED orcid.org/0000-0001-7450-4672 UNSPECIFIED Tobbens, Daniel UNSPECIFIED UNSPECIFIED UNSPECIFIED Cheng, Baochang UNSPECIFIED UNSPECIFIED UNSPECIFIED Chen, Yiwang UNSPECIFIED UNSPECIFIED UNSPECIFIED Riedl, Thomas UNSPECIFIED orcid.org/0000-0003-1084-316X UNSPECIFIED
URN:	urn:nbn:de:hbz:38-224868
DOI:	10.1002/adma.201606656
Journal or Publication Title:	Adv. Mater.
Volume:	29
Number:	27
Date:	2017
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 ORGANOMETAL HALIDE PEROVSKITES; TRANSPARENT ELECTRODES; PERFORMANCE; DECOMPOSITION; TEMPERATURE; FILMS; SNO2 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/22486