Journal
CHEMISTRY OF MATERIALS
Volume 30, Issue 21, Pages 7587-7592Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.8b02757
Keywords
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Funding
- Ministry of Science and Technology in Taiwan
- Wiener-Anspach Foundation
- Leverhulme Trust (Isaac Newton Trust)
- Institutional Strategy of the University of Tuebingen (Deutsche Forschungsgemeinschaft) [ZUK63]
- EC FP7 SC2 [610115]
- EPSRC [EP/G037515/1, EP/M024873/1, EP/M005143/1]
- EC H2020 [643791]
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Three thiophene ring-terminated benzothieno[3,2-b]-benzothiophene (BTBT) derivatives, C-C6-DBTTT, C-C12-DBTTT, and L-C12-DBTTT, were designed and synthesized, differing in the isomerization of alkyl chain position as well as aromatic core construction. A study of crystal structure and electronic properties combined with a theoretical investigation was performed to understand the structure-property relationships for the application of these molecules in organic field-effect transistors (OFETs). Different crystal packing structures were observed for these three isomers by single-crystal X-ray diffraction as a result of a crystal engineering molecular design approach. The highest charge-carrier mobility was observed for the isomer with a collinear core, L-C12-DBTTT. Preliminary results demonstrated a promising hole mobility of 2.44 cm(2) V-1 s(-1), despite the polymorphism observed in ambient conditions.
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