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Molecular semiconductor blends: Microstructure, charge carrier transport, and application in photovoltaic cells by Andreas Opitz; Julia Wagner; Wolfgang Brütting; Alexander Hinderhofer; Frank Schreiber is a Materials Science article available to read on EtoBox.

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## Abstract Ambipolar organic semiconductor blends, i.e. mixtures of electron and hole conducting materials, attain growing interest due to their utilization in quasi‐complementary organic field‐effect transistors and organic photovoltaic cells. Many investigations in the latter field have reported an increase of the solar cell efficiency by optimizing the balance between charge carrier transport in phase‐separated structures and exciton dissociation at the interface between these phases. Here we show the implications of blending molecular materials for structural, optical, and electrical properties in two model systems for organic photovoltaic cells. We have investigated blends and neat films of the hole transporting material Cu‐phthalocyanine (CuPc) together with fullerene C~60~ and Cu‐hexadecafluorophthalocyanine (F~16~CuPc) as electron transporting materials, respectively. On the one hand, the difference in molecular structure of the spherical C~60~ and the planar molecule CuPc leads to nanophase separation in a blend of both of them, causing charge carrier transport being limited by the successful formation of percolation paths. On the other hand, blends of the similar shaped

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Author

Andreas Opitz; Julia Wagner; Wolfgang Brütting; Alexander Hinderhofer; Frank Schreiber

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Ltd.; Wiley; Wiley - V C H Verlag GmbbH & Co. (ISSN 0031-8965)

Published

2009

Language

EN

Field

Materials Science (Physical Sciences)