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Morphological and electrical effect of an ultrathin iridium oxide hole extraction layer on P3HT:PCBM bulk-heterojunction solar cells

Title
Morphological and electrical effect of an ultrathin iridium oxide hole extraction layer on P3HT:PCBM bulk-heterojunction solar cells
Authors
Jung, GHLim, KGLee, TWLee, JL
POSTECH Authors
Lee, TWLee, JL
Date Issued
Apr-2011
Publisher
ELSEVIER SCIENCE BV
Abstract
An ultrathin iridium layer was treated with O(2)-plasma to form an iridium oxide (IrO(x)), employed as a hole extraction layer in order to replace poly(3,4-ethylenedioxythiophene):poly(styrene-sulfonate) (PEDOT:PSS) in organic photovoltaic (OPV) cells with poly(3-hexylthiophene):phenyl-C61-butyric acid methyl ester (P3HT:PCBM). The IrO(x) layer affects the self-organization of the P3HT:PCBM photo-active layer due to its hydrophobic nature, inducing a well-organized intraplane structure with lamellae oriented normal to the substrate. Synchrotron radiation photoelectron spectroscopy results showed that the work function increased by 0.57 eV as the It layer on ITO changed to IrO(x) by the O(2)-plasma treatment. The OPV cell with IrO(x) (2.0 nm) exhibits increased power conversion efficiency as high as 3.5% under 100 mW cm(-2) illumination with an air mass (AM 1.5G) condition, higher than that of 3.3% with PEDOT:PSS. (C) 2010 Elsevier B.V. All rights reserved.
Keywords
Organic solar cell; P3HT:PCBM; Hole extraction layer; Iridium oxide; Polymer solar cell; LIGHT-EMITTING-DIODES; OPTICAL-PROPERTIES; PHOTOVOLTAIC CELLS; CONJUGATED POLYMER; THIN-FILMS; INJECTION; SPECTROSCOPY; PERFORMANCE; IMPROVE; ANODE
URI
http://oasis.postech.ac.kr/handle/2014.oak/17567
DOI
10.1016/J.SOLMAT.2010.12.039
ISSN
0927-0248
Article Type
Article
Citation
SOLAR ENERGY MATERIALS AND SOLAR CELLS, vol. 95, no. 4, page. 1146 - 1150, 2011-04
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 LEE, TAE WOO
Dept of Materials Science & Enginrg
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