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Transistor Performance and Film Structure of Hexabenzocoronene Derivatives

Published online by Cambridge University Press:  01 February 2011

Tomohiko Mori
Affiliation:
tomohiko@mosk.tytlabs.co.jp, TOYOTA Central R&D Labs., Inc., Information & Electronics Dept., 41-1 Yokomichi, Nagakute, 480-1192, Japan
Yoshihiro Kikuzawa
Affiliation:
e1319@mosk.tytlabs.co.jp, TOYOTA Central R&D Labs., Inc., Information & Electronics Dept., 41-1 Yokomichi, Nagakute, Aichi, 480-1192, Japan
Kazuhiko Umemoto
Affiliation:
e1234@mosk.tytlabs.co.jp, TOYOTA Central R&D Labs., Inc., Information & Electronics Dept., 41-1 Yokomichi, Nagakute, Aichi, 480-1192, Japan
Hiroshi Nozaki
Affiliation:
e1236@mosk.tytlabs.co.jp, TOYOTA Central R&D Labs., Inc., Information & Electronics Dept., 41-1 Yokomichi, Nagakute, Aichi, 480-1192, Japan
Yoshiki Seno
Affiliation:
e0667@mosk.tytlabs.co.jp, TOYOTA Central R&D Labs., Inc., Information & Electronics Dept., 41-1 Yokomichi, Nagakute, Aichi, 480-1192, Japan
Hisato Takeuchi
Affiliation:
e0910@mosk.tytlabs.co.jp, TOYOTA Central R&D Labs., Inc., Information & Electronics Dept., 41-1 Yokomichi, Nagakute, Aichi, 480-1192, Japan
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Abstract

Hexabenzocoronene (HBC) derivatives that are designed to self-assemble into lamellar aggregates were synthesized. The derivatives were deposited as an active layer in an organic field-effect transistor (OFET) using vacuum sublimation. The dihexyl and tetrahexyl derivatives (2H-HBC, 4H-HBC) increased the field-effect mobilities and on/off ratios by a factor of 10 or more compared to unsubstituted HBC and hexahexyl-hexabenzocoronene (6H-HBC). The crystal and thin film structures were determined by powder x-ray diffraction and grazing incidence X-ray diffraction (GIXD). The data indicate that 2H-HBC and 4H-HBC self-assemble into lamellar aggregates. 2H-HBC forms layers of aromatic cores that are sandwiched by the layers of hexyl groups, which is a preferable crystal structure for carrier transport. The good OFET performance could be explained by the self-assembly in lamellar aggregates of 2H-HBC and 4H-HBC, in contrast to self-assembly in the columnar aggregate of 6H-HBC and the low self-assembling properties of unsubstituted HBC.

Type
Research Article
Copyright
Copyright © Materials Research Society 2008

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