Uniaxially oriented polycrystalline thin films and air-stable n -type transistors based on donor-acceptor semiconductor (diC8BTBT)(FnTCNQ) [n= 0, 2, 4]

Yosei Shibata, Jun'Ya Tsutsumi, Satoshi Matsuoka, Koji Matsubara, Yuji Yoshida, Masayuki Chikamatsu, Tatsuo Hasegawa

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30 Citations (Scopus)

Abstract

We report the fabrication of high quality thin films for semiconducting organic donor-acceptor charge-transfer (CT) compounds, (diC8BTBT)(FnTCNQ) (diC8BTBT = 2,7-dioctyl[1]benzothieno[3,2-b][1]benzothiophene and FnTCNQ [n = 0,2,4] = fluorinated derivatives of 7,7,8,8,-tetracyanoquinodimethane), which have a high degree of layered crystallinity. Single-phase and uniaxially oriented polycrystalline thin films of the compounds were obtained by co-evaporation of the component donor and acceptor molecules. Organic thin-film transistors (OTFTs) fabricated with the compound films exhibited n-type field-effect characteristics, showing a mobility of 6.9 × 10-2 cm2/V s, an on/off ratio of 106, a sub-threshold swing of 0.8 V/dec, and an excellent stability in air. We discuss the suitability of strong intermolecular donor-acceptor interaction and the narrow CT gap nature in compounds for stable n-type OTFT operation.

Original languageEnglish
Article number143303
JournalApplied Physics Letters
Volume106
Issue number14
DOIs
Publication statusPublished - 2015 Apr 6
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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