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Dyes in vertically aligned carbon nanotube arrays for solar cell applications

: Lackner, G.; Endler, I.; Meissner, F.; Scholz, S.; Mayer-Uhma, T.; Liebschner, R.; Bezugly, V.; Meiss, J.; Mkandawire, M.; Boucher, R.; Michaelis, A.; Lupascu, D.C.


Li, G. ; Materials Research Society -MRS-:
Organic photovoltaics - materials to devices : Symposium held November 28 - December 2, 2011, Boston, Massachusetts, U.S.A.; at the 2011 MRS fall meeting
Cambridge: Cambridge University Press, 2012 (Materials Research Society Symposium Proceedings 1390)
ISBN: 978-1-605-11367-8
ISSN: 0272-9172
Symposium H "Organic Photovoltaic Devices and Processing" <2011, Boston/Mass.>
Symposium I "Fundamental Processes of Solar Harvesting in Excitonic Solar Cells" <2011, Boston/Mass.>
Materials Research Society (Fall Meeting) <2011, Boston/Mass.>
Fraunhofer IKTS ()

The infiltration of dissolved dyes into vertically aligned carbon nanotube arrays (va-CNT) is reported. The ultra hydrophobic surface of the CNT forest can be wetted and hence infiltrated for an appropriate choice of solvent. The dye-infiltrated CNT array forms a well ordered bulk-heterojunction structure for organic solar cells in which the CNT can act as a large electrode or, for appropriate energy levels, as an acceptor material. Derivatives of the small molecule copper phthalocyanine or the polymer poly(3-hexylthiophene) were used as dyes. Drop coating was chosen as the infiltration technique resulting in a completely embedded CNT forest. Field emission secondary electron microscopy analysis illustrates the final layer quality. Common electrical characterization under AM1.5 illuminatio n proves photosensitivity and implies photovoltaic behavior of the composite.