Universität zu Köln

Moellmann, Alexander, Gedamu, Dawit, Vivo, Paola ORCID: 0000-0003-2872-6922, Frohnhoven, Robert, Stadler, Daniel, Fischer, Thomas, Ka, Ibrahima, Steinhorst, Maximilian, Nechache, Riad, Rosei, Federico ORCID: 0000-0001-8479-6955, Cloutier, Sylvain G., Kirchartz, Thomas ORCID: 0000-0002-6954-8213 and Mathur, Sanjay (2019). Highly Compact TiO2 Films by Spray Pyrolysis and Application in Perovskite Solar Cells. Adv. Eng. Mater., 21 (4). WEINHEIM: WILEY-V C H VERLAG GMBH. ISSN 1527-2648

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Abstract

Transparent and pinhole free hole-blocking layers such as TiO2 grown at low temperatures and by scalable processes are necessary to reduce production costs and thus enabling commercialization of perovskite solar cells. Here, the authors compare the transport properties of TiO2 compact layers grown by spray pyrolysis from commonly used titanium diisopropoxide bisacetylacetonate ([Ti(OPri)(2)(acac)(2)]) precursor to films grown by spray pyrolysis of TiCl4. Spray pyrolysis provides insights into the interdependence of precursor chemistry and electron transport properties of TiO2 films and their influence on the performance of the perovskite solar cells. X-ray diffraction and X-ray photoelectron spectroscopy data confirm the chemical and structural composition of the obtained films. Thin film deposition at lower temperature (150 degrees C) are conducted using TiCl4 to evaluate the influence of crystal growth and topography by scanning electron microscopy and atomic force microscopy as well as thickness (profilometry) and transmittance (UV/Vis spectroscopy) on the power conversion efficiency of perovskite solar cells. TiO2 compact layers grown from TiCl4 enhance the power conversion efficiency by acting as superior electron transfer medium and by reducing hysteresis behavior, when compared to films grown using titanium diisopropoxide bisacetylacetonate. UV/Vis spectroscopy and external quantum efficiency studies reveal the correlation of transmittance on the power conversion efficiency.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Moellmann, Alexander UNSPECIFIED UNSPECIFIED UNSPECIFIED Gedamu, Dawit UNSPECIFIED UNSPECIFIED UNSPECIFIED Vivo, Paola UNSPECIFIED orcid.org/0000-0003-2872-6922 UNSPECIFIED Frohnhoven, Robert UNSPECIFIED UNSPECIFIED UNSPECIFIED Stadler, Daniel UNSPECIFIED UNSPECIFIED UNSPECIFIED Fischer, Thomas UNSPECIFIED UNSPECIFIED UNSPECIFIED Ka, Ibrahima UNSPECIFIED UNSPECIFIED UNSPECIFIED Steinhorst, Maximilian UNSPECIFIED UNSPECIFIED UNSPECIFIED Nechache, Riad UNSPECIFIED UNSPECIFIED UNSPECIFIED Rosei, Federico UNSPECIFIED orcid.org/0000-0001-8479-6955 UNSPECIFIED Cloutier, Sylvain G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kirchartz, Thomas UNSPECIFIED orcid.org/0000-0002-6954-8213 UNSPECIFIED Mathur, Sanjay UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-151440
DOI:	10.1002/adem.201801196
Journal or Publication Title:	Adv. Eng. Mater.
Volume:	21
Number:	4
Date:	2019
Publisher:	WILEY-V C H VERLAG GMBH
Place of Publication:	WEINHEIM
ISSN:	1527-2648
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Chemistry > Institute of Inorganic Chemistry
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language ELECTRON-TRANSPORT LAYERS; HOLE-BLOCKING LAYER; LEAD-HALIDE; EFFICIENT; HYSTERESIS; CH3NH3PBI3; PERFORMANCE; IODIDE; EXTRACTION; DEPOSITION Multiple languages Materials Science, Multidisciplinary Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/15144