Journal
ORGANIC ELECTRONICS
Volume 14, Issue 7, Pages 1715-1719Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.orgel.2013.04.007
Keywords
Sputtering; Anatase TiO2; Vacuum annealing; Organic photovoltaics; Solar cells
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We demonstrate the deposition of amorphous and anatase TiO2 on indium tin oxide (ITO) substrates via the process of sputtering, and the use of these materials as electron-collecting layers (ECLs) in inverted-type organic photovoltaics (OPVs). Anatase TiO2 was obtained via vacuum-annealing of as-deposited amorphous TiO2 at 300 degrees C. No deterioration of optical and electrical properties of ITO was observed after both sputter-deposition of TiO2 and annealing process. The anatase TiO2 proved to be an effective ECL when employed in inverted OPVs using bulk heterojunction photoactive layer of poly(3-hexylthiophene) and [6,6]-phenyl-C61-butyric acid methyl ester, achieving a power conversion efficiency of 3.3% (J(SC) = 9.0 mA cm(-2), V-OC = 0.62 V and FF = 0.60). (C) 2013 Elsevier B.V. All rights reserved.
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