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Proceedings Paper

Photohole generation in smectic liquid crystalline photoconductor
Author(s): Hong Zhang; Hiroki Maeda; Masahiro Funahashi; Jun-ichi Hanna
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Paper Abstract

The photo-hole generation process in the smectic phases of a liquid crystalline photoconductor, 2-(4'-octylpheny)-6- dodecyoxylnaphthalene (8-PNP-012) was investigated by using steady-state and transient photocurrent measurements. It was revealed that the photo-generation of holes was governed by two different processes: Onsager type of photo-carrier generation in the bulk and electrode-enhanced hole injection induced by the charge transfer from photo-excited 8-PNP-012 molecules to the electrode interface. In the former process, for fairly high light intensity, the collected photo- generation charge was found to be approximately proportional to the square of the light intensity irrespective of the phase, suggesting the contribution of exciton-exciton interactions. And in the latter process, the photogeneration quantum yield can be one order of magnitude larger than that in the bulk generation process. We will discuss totally the photo-carrier generation process in mesophases of 8-PNP-012, in terms of exciton-exciton and exciton-electrode interactions including the effect of electrode materials and the disorder of molecular arrangement.

Paper Details

Date Published: 5 October 1999
PDF: 10 pages
Proc. SPIE 3799, Organic Photorefractives, Photoreceptors, Waveguides, and Fibers, (5 October 1999); doi: 10.1117/12.363896
Show Author Affiliations
Hong Zhang, Tokyo Institute of Technology (Japan)
Hiroki Maeda, Dai Nippon Printing Co. Ltd. (Japan)
Masahiro Funahashi, Tokyo Institute of Technology (Japan)
Jun-ichi Hanna, Tokyo Institute of Technology (Japan)


Published in SPIE Proceedings Vol. 3799:
Organic Photorefractives, Photoreceptors, Waveguides, and Fibers
David H. Dunlap; Stephen Ducharme; David H. Dunlap; Robert A. Norwood; Robert A. Norwood, Editor(s)

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