Cruciform conjugated molecule, 4(HP3T)-benzene bearing terthiophene moieties has been synthesized through Heck coupling reaction using 5-hexyl-5″-vinyl-[2,2′,5′,2″]terthiophene as dendrons and 1,2,4,5-tetrabromo-benzene as the core unit; this molecule has been fully characterized. This terthiophene-based molecule exhibits good solubility in common organic solvents and good self-film forming property. They are intrinsically crystalline as they exhibit well-defined X-ray diffraction patterns from uniform orientations of molecules. Thus, intermolecular interaction can be enhanced to affect the carrier transport phenomena after annealing at 160 °C. The semiconducting property of 4(HP3T)-benzene has been evaluated in organic field-effect transistors. 4(HP3T)-benzene exhibit carrier mobility as high as (3.7 ± 0.5) × 10-4 cm2 V-1 s-1 with an on/off ratio of about 1 × 103.
Bibliographical noteFunding Information:
This research work was supported by 21st century Frontier Research Program (F0004091-0000-00) and LG-Philips-LCD Co. Ltd. (2006–2007). Particularly, M.J. Cho acknowledges the financial support by the Seoul R&BD Program (2006–2007).
Copyright 2008 Elsevier B.V., All rights reserved.
- Cruciform molecule
- Organic field-effect transistor
- Organic semiconductor
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering
- Metals and Alloys
- Materials Chemistry