화학공학소재연구정보센터
Journal of Industrial and Engineering Chemistry, Vol.114, 161-170, October, 2022
[1]Benzothieno[3,2-b][1]benzothiophene-based liquid crystalline organic semiconductor for solution-processed organic thin film transistors
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Liquid crystalline organic semiconductors have drawn tremendous interest due to potentials of applications in organic thin-film transistors (OTFTs) with their high electrical performance and solutionprocessability. However, alkylated liquid crystals often encounter poor thermal durability and mobility drop at smectic E (SmE) phase. Here, we introduce new solution-processable [1]benzothieno[3,2-b][1]b enzothiophene-based small molecules with different types of alkyl side chains for OTFTs. All BTBT derivatives showed smectic phase; dialkylated 2-octyl-7-(50-octyl-[2,20-bithiophen]-5-yl)benzo[b]benzo[4,5]t hieno[2,3-d]thiophene (O-2Th-BTBT) and 2-(50-(2-ethylhexyl)-[2,20-bithiophen]-5-yl)-7-octylbenzo[b]b enzo[4,5]thieno[2,3-d]thiophene (E-2Th-BTBT) suffered mobility degradation at SmE phase. However, monoalkylated 2-([2,20-bithiophen]-5-yl)-7-octylbenzo[b]benzo[4,5]thieno[2,3-d]thiophene (2Th-BTBT) did not exhibit SmE phase over temperature range, resulting in high carrier mobility up to 0.31 cm2/Vs through molecular bilayer transition by thermal annealing. Physicochemical and liquid crystal properties were analyzed, and thin film characterization by atomic force microscopy and X-ray diffraction was discussed.
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