Observation of field-induced charge carriers in high-mobility organic transistors of a thienothiophene-based small molecule: Electron spin resonance measurements

Hisaaki Tanaka, Masato Kozuka, Shun Ichiro Watanabe, Hiroshi Ito, Yukihiro Shimoi, Kazuo Takimiya, Shin Ichi Kuroda

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

Electron spin resonance (ESR) measurements are performed on field-induced charge carriers in high-mobility organic transistors of polycrystalline dioctylbenzothieno[2,3-b]benzothiophene (C8-BTBT) films. The angular dependences of the ESR spectra are well fitted by orthorhombic g values with the largest component of gY = 2.0110 nearly parallel to the normal direction of the substrate but tilted by 5°. The results indicate a highly organized end-on alignment of C8-BTBT molecules at the device interface. The ESR linewidth exhibits motional narrowing down to 4 K, providing microscopic evidence for high carrier mobilities within the crystalline domains of C8-BTBT.

Original languageEnglish
Article number081306
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume84
Issue number8
DOIs
Publication statusPublished - 2011 Aug 29
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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