Journal
ORGANIC ELECTRONICS
Volume 10, Issue 7, Pages 1259-1267Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.orgel.2009.07.004
Keywords
Phthalocyanines; Vacuum deposition; Mixed crystalline films; Photovoltaic cells
Funding
- Deutsche Forschungsgerneinschaft
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Blends of organic electron and hole conductive materials are widely used for ambipolar charge carrier transport and photovoltaic cells. An obvious choice for donor-acceptor blends are organic semiconducting materials in their hydrogenated and fluorinated form, since they combine potentially suitable electronic properties with structural compatibility of the two constituents. This study focuses on the structural, optical, and electrical properties of blends using hydrogenated copper-phthalocyanine (H(16)CuPc) in combination with its per-fluorinated version (F(16)CuPc), Using X-ray scattering, scanning force microscopy and optical absorption measurements we show that mixed crystalline films are obtained by co-evaporation of the two materials. Electrical transport measurements reveal a profound reduction of the current for bipolar charge injection in mixed films. We discuss the formation of self-trapped charge transfer excitons as possible explanation for this unexpected behaviour, which impedes the usability of this system in photovoltaic cells. (C) 2009 Elsevier B.V. All rights reserved.
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