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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/19773

Title: An electron beam evaporated TiO2 layer for high efficiency planar perovskite solar cells on flexible polyethylene terephthalate substrates
Authors: Qiu, Weiming
Paetzold, Ulrich W.
Gehlhaar, Robert
Smirnov, Vladimir
Boyen, Hans-Gerd
Tait, Jeffrey G.
Conings, Bert
Zhang, Weimin
Nielsen, Christian B.
McCulloch, Iain
Froyen, Ludo
Heremans, Paul
Cheyns, David
Issue Date: 2015
Citation: Journal of Materials Chemistry A, 3 (45), p. 22824-22829
Abstract: The TiO2 layer made by electron beam (e-beam) induced evaporation is demonstrated as an electron transport layer (ETL) in high efficiency planar junction perovskite solar cells. The temperature of the substrate and the thickness of the TiO2 layer can be easily controlled with this e-beam induced evaporation method, which enables the usage of different types of substrates. Here, perovskite solar cells based on CH3NH3PbI3−xClx achieve power conversion efficiencies of 14.6% on glass and 13.5% on flexible plastic substrates. The relationship between the TiO2 layer thickness and the perovskite morphology is studied by scanning electron microscopy (SEM), atomic force microscopy (AFM), and X-ray photoelectron spectroscopy (XPS). Our results indicate that the pinholes in the thin TiO2 layer lead to pinholes in the perovskite layer. By optimizing the TiO2 thickness, perovskite layers with substantially increased surface coverage and reduced pinhole areas are fabricated, increasing overall device performance.
Notes: Qiu, WM (reprint author), Imec, Kapeldreef 75, B-3001 Heverlee, Belgium. Weiming.Qiu@imec.be; Paul.Heremans@imec.be
URI: http://hdl.handle.net/1942/19773
DOI: 10.1039/C5TA07515G
ISI #: 000365011400035
ISSN: 2050-7488
Category: A1
Type: Journal Contribution
Validation: ecoom, 2016
Appears in Collections: Research publications

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