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Proceedings Paper

Charge transport and charge generation in the bulk and at interfaces: discotic hole conductors versus amorphous hole conductors
Author(s): Dietrich Haarer; Roland Bilke; Mukundan Thelakkat; Claus Jaeger
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Paper Abstract

We describe two methods by which discotic liquid crystalline (LC) triphenylene materials can be sensitized for wavelengths of the visible spectrum and the near IR. One way of doping is more conventional and uses bi-layers between the LC-system and an adjacent pigment layer. The second doping is achieved by a molecular doping with C70. Here the influence of doping on the measured mobilities is much smaller as compared to the influence of doping measured in amorphous systems. We attribute this smaller influence of the C70-doping on the mobility to a partial phase separation occuring between the LC-host material and the C70-guest molecules. In our comparative experiments on doped dimethyl-triphenyldiamines we can show taht the magnitude of the trap depths for hole-trapping has a very large influence on the measured transport parameters.

Paper Details

Date Published: 14 July 2003
PDF: 8 pages
Proc. SPIE 4991, Organic Photonic Materials and Devices V, (14 July 2003); doi: 10.1117/12.475456
Show Author Affiliations
Dietrich Haarer, Univ. of Bayreuth (Germany)
Roland Bilke, Univ. of Bayreuth (Germany)
Mukundan Thelakkat, Univ. of Bayreuth (Germany)
Claus Jaeger, Univ. of Bayreuth (Germany)

Published in SPIE Proceedings Vol. 4991:
Organic Photonic Materials and Devices V
James G. Grote; Toshikuni Kaino, Editor(s)

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