Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 5, Issue 9, Pages 3855-3860Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am4005368
Keywords
pyrene; liquid crystals; organic semiconductors; thin films; field-effect transistors
Funding
- Industrial Strategic Technology Development Program [KI002104]
- Ministry of Knowledge Economy (MKE, Korea)
- Center for Advanced Soft Electronics under the Global Frontier Research Program of the Ministry of Education, Science and Technology, Korea [2012055225]
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Numerous conjugated oligoacenes and polythiophenes are being heavily studied in the search for high-mobility organic semiconductors. Although many researchers have designed fused aromatic compounds as organic semiconductors for organic thin-film transistors (OTFTs), pyrene-based organic semiconductors with high mobilities and on-off current ratios have not yet been reported. Here, we introduce a new pyrene-based p-type organic semiconductor showing liquid crystal behavior. The thin film characteristics of this material are investigated by varying the substrate temperature during the deposition and the gate dielectric condition using the surface modification with a self-assembled monolayer, and systematically studied in correlation with the performances of transistor devices with this compound. OTFT fabricated under the optimum deposition conditions of this compound, namely, 1,6-bis(5'-octyl-2,2'-bithiophen-5-yl)pyrene (BOBTP) shows a high-performance transistor behavior with a field-effect mobility of 2.1 cm(2) V-1 s(-1) and an on-off current ratio of 7.6 x 10(6) and enhanced long-term stability compared to the pentacene thin-film transistor.
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