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Photoconductivity of Discotic Liquid Crystals Derived from A Long-Chain Tetraphenylporphyrin

Published online by Cambridge University Press:  10 February 2011

Y. Shimizu ,
H. Monobe ,
S. Mima ,
T. Higashiyama ,
T. Fuchita  and
T. Sugino
Y. Shimizu
Affiliation:
Department of Organic Materials, Osaka National Research Institute (ONRI), AIST-MITI Midorigaoka 1-8-31, Ikeda, Osaka 563, Japan
H. Monobe
Affiliation:
Department of Organic Materials, Osaka National Research Institute (ONRI), AIST-MITI Midorigaoka 1-8-31, Ikeda, Osaka 563, Japan
S. Mima
Affiliation:
In undergraduate study course joined from Department of Material Chemistry, Ryukoku University
T. Higashiyama
Affiliation:
In graduate and undergraduate study course joined from Department of Solid-State Electronics, Osaka Electro-Communication University
T. Fuchita
Affiliation:
In graduate and undergraduate study course joined from Department of Solid-State Electronics, Osaka Electro-Communication University
T. Sugino
Affiliation:
Department of Organic Materials, Osaka National Research Institute (ONRI), AIST-MITI Midorigaoka 1-8-31, Ikeda, Osaka 563, Japan
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Abstract

Photoconductivity of a mesogenic tetraphenylporphyrin (TPP) is shown in relation to the mesomorphic phase transition behavior. The TPP mesogen shows two types of mesophases having smectic-like order (lamellar mesophases : DL and DLC phases named in this work) and the photocurrent changes stepwise at the phase transitions with non-Arrhenius dependence whilst the darkcurrent tends to be Arrhenius. The hole mobility was measured for the random domain cell and was found to be faster than 10−4 cm2v−1sec−1 in the mesophases. The cell used for the photocurrent measurements was a sandwich-type one using two ITO glass slides as electrtodes and show rectification behavior for the crystal and the low-temperature mesophase (DLC) in contrast to non-rectification of photocurrent in the high-temperature mesophase (DL). These properties of charge carrier migration as an electronic process are profoundly related to molecular order as well as molecular motions in mesophase.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 559: Symposium D – Liquid Crystals Materials and Devices , 1999 , 211
Copyright
Copyright © Materials Research Society 1999

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References

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