title: A highly conducting organic metal derived from an organic-transistor material: benzothienobenzothiophene.
abstract: BTBT ([1]benzothieno[3,2-b][1]benzothiophene) is an organic semiconductor that realizes high mobility in organic transistors. Here we report that the charge-transfer (CT) salt, (BTBT)2PF6, shows a high room-temperature conductivity of 1500 S cm(-1). This compound exhibits a resistivity jump around 150 K, but when it is covered with Apiezon N grease the resistivity jump is suppressed, and the metallic conductivity is maintained down to 60 K. Owing to the very high conductivity, the ESR signal shows a significantly asymmetric Dysonian lineshape (A/B ≅ 3) even at room temperature. Since most organic conductors are based on strong electron donors, it is remarkable that such a weak electron donor as BTBT realizes a stable and highly conducting organic metal.
authors.affiliation: Department of Organic and Polymeric Materials, Tokyo Institute of Technology, 2-12-1 O-okayama, Meguro-ku, Tokyo 152-8552, Japan. kadoya.t.aa@m.titech.ac.jp.
authors.forename: Tomofumi
authors.initials: T
authors.lastname: Kadoya
authors.forename: Minoru
authors.initials: M
authors.lastname: Ashizawa
authors.forename: Toshiki
authors.initials: T
authors.lastname: Higashino
authors.forename: Tadashi
authors.initials: T
authors.lastname: Kawamoto
authors.forename: Shohei
authors.initials: S
authors.lastname: Kumeta
authors.forename: Hidetoshi
authors.initials: H
authors.lastname: Matsumoto
authors.forename: Takehiko
authors.initials: T
authors.lastname: Mori