Journal
RSC ADVANCES
Volume 6, Issue 97, Pages 95149-95155Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ra22999a
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Funding
- Shenzhen Key Laboratory of Organic Optoelectromagnetic Functional Materials of Shenzhen Science and Technology Plan [ZDSYS20140509094114164]
- National Natural Science Foundation of China [51603003]
- Shenzhen Peacock Program [KQTD2014062 714543296]
- Shenzhen Science and Technology Research Grant [JCYJ20160331095335232, JCYJ20140509093817690]
- Nanshan Innovation Agency Grant [KC2015ZDYF0016A]
- Guangdong Key Research Project [2014B090914003, 2015B090914002]
- Guangdong Talents Project
- National Basic Research Program of China (973 Program) [2015CB856500]
- China Postdoctoral Science Foundation [2015M570892]
- Natural Science Foundation of Guangdong Province [2014A030313800]
- Guangdong Academician Workstation [2013B090400016]
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Two environmentally and thermally stable [1] benzothieno[3,2-b][1] benzothiophene (BTBT) derivatives, 2-phenyl[1]benzothieno[3,2-b][1]benzothiophene (Ph-BTBT) and 2-(4-hexylphenyl)[1]benzothieno[3,2-b][1] benzothiophene (C6-Ph-BTBT), are prepared by Suzuki coupling. Organic thin-film transistors with a top-contact and bottom-gate based on BTBT, Ph-BTBT and C6-Ph-BTBT are fabricated by vacuum-deposition on octyltrichlorosilane treated Si/SiO2 substrates. Experimental results show that the thin-film based on BTBT sublimes instantly after the deposition of electrodes, and no semiconductor signal is detected. Ph-BTBT shows a mobility of 0.034 cm(2) V-1 s(-1). Furthermore, C6-Ph-BTBT exhibits three liquid crystal phases (Sm A, Sm E and Sm K or H) and achieves the highest hole mobility of 4.6 cm(2) V-1 s(-1) with an on/off ratio of 2.2 x 10(7) for polycrystalline organic thin-film transistors in ambient air. The present study exemplifies that the introduction of mesoscopic order in molecular design provides a general approach for the high electronic performance of organic semiconductors.
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