Benzothienobenzothiophene-Based Molecular Conductors: High Conductivity, Large Thermoelectric Power Factor, and One-Dimensional Instability

Yasuhiro Kiyota, Tomofumi Kadoya, Kaoru Yamamoto, Kodai Iijima, Toshiki Higashino, Tadashi Kawamoto, Kazuo Takimiya, Takehiko Mori

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

On the basis of an excellent transistor material, [1]benzothieno[3,2-b][1]benzothiophene (BTBT), a series of highly conductive organic metals with the composition of (BTBT)2XF6 (X = P, As, Sb, and Ta) are prepared and the structural and physical properties are investigated. The room-temperature conductivity amounts to 4100 S cm-1 in the AsF6 salt, corresponding to the drift mobility of 16 cm2 V-1 s-1. Owing to the high conductivity, this salt shows a thermoelectric power factor of 55-88 μ K-2 m-1, which is a large value when this compound is regarded as an organic thermoelectric material. The thermoelectric power and the reflectance spectrum indicate a large bandwidth of 1.4 eV. These salts exhibit an abrupt resistivity jump under 200 K, which turns to an insulating state below 60 K. The paramagnetic spin susceptibility, and the Raman and the IR spectra suggest 4kF charge-density waves as an origin of the low-temperature insulating state.

Original languageEnglish
Pages (from-to)3920-3925
Number of pages6
JournalJournal of the American Chemical Society
Volume138
Issue number11
DOIs
Publication statusPublished - 2016 Mar 23
Externally publishedYes

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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