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Fabrication of polycrystalline thin films of liquid crystalline materials by solution process and its application to OFETs

Published online by Cambridge University Press:  01 February 2011

Hiroaki Iino
Affiliation:
iino@isl.titech.ac.jp, Tokyo Institute of Technology, Imaging Science & Engineering Laboratory, 4259 Nagatsuta, Midori-ku, Yokohama, 226-8503, Japan
Jun-ichi Hanna
Affiliation:
hanna@isl.titech.ac.jp, Tokyo Institute of Technology, Imaging Science & Engineering Laboratory, 4259 Nagatsuta, Midori-ku, Yokohama, 226-8503, Japan
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Abstract

We have fabricated polycrystalline OFETs of two different liquid crystalline materials i.e., ω,ω'-dihexylquaterthipohene (6-QTP-6) and N, N'-ditridecylperylenediimide (13-Per-13) by solution process. Liquid crystalline materials help fabricating uniform thin films on the substrate when spin-coated at their temperature range of liquid crystalline phase. The FETs fabricated with 6-QTP-6 exhibited p-channel performance and its mobility was determined to be 0.04 cm2/Vs, which was comparable to that determined by time-of-flight experiments. The FETs fabricated with 13-Per-13 exhibited n-channel performance and its FET mobility was 0.008 cm2/Vs, while the mobility was increased up to 0.11 cm2/Vs after thermal annealing of the film at a liquid crystalline temperature of 220°C for an hour. Judging from these facts, the grain boundaries are controlled not so as to across the conduction channels formed by self-aligned π-conjugated aromatic cores in liquid crystalline molecules. We conclude that liquid crystalline material is a good candidate for quality polycrystalline thin films for OFETs.

Type
Research Article
Copyright
Copyright © Materials Research Society 2008

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