title: High-mobility pyrene-based semiconductor for organic thin-film transistors.
abstract: 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 × 10(6) and enhanced long-term stability compared to the pentacene thin-film transistor.
authors.affiliation: Department of Electrical and Computer Engineering, Inter-university Semiconductor Research Center, Seoul National University, Seoul 151-744, Korea.
authors.forename: Hyunduck
authors.initials: H
authors.lastname: Cho
authors.forename: Sunyoung
authors.initials: S
authors.lastname: Lee
authors.forename: Nam Sung
authors.initials: NS
authors.lastname: Cho
authors.forename: Ghassan E
authors.initials: GE
authors.lastname: Jabbour
authors.forename: Jeonghun
authors.initials: J
authors.lastname: Kwak
authors.forename: Do-Hoon
authors.initials: DH
authors.lastname: Hwang
authors.forename: Changhee
authors.initials: C
authors.lastname: Lee
mesh_terms: D050866:Liquid Crystals / Q000737:chemistry*; D011721:Pyrenes / Q000737:chemistry*; D012666:Semiconductors; D013696:Temperature
chemical_list: D011721:Pyrenes