Orientation control of pentacene molecules and transport anisotropy of the thin film transistors by photoaligned polyimide film

Dong Guo, Kenji Sakamoto, Kazushi Miki, Susumu Ikeda, Koichiro Saiki

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)

Abstract

The authors report preferential in-plane molecular orientation and charge transport anisotropy in pentacene thin film transistors achieved by using a photoaligned polyimide film with large in-plane anisotropy. Polarized infrared absorption spectra indicated that the molecular plane normal of the pentacene preferentially aligned along the average orientation direction of the underlying polyimide backbone structure. Atomic force microscope images showed that the alignment of the polyimide backbone structure significantly modified the pentacene growth process and remarkably increased the grain size. The charge carrier mobility along the polyimide alignment direction was about twice of that perpendicular to it.

Original languageEnglish
Article number102117
JournalApplied Physics Letters
Volume90
Issue number10
DOIs
Publication statusPublished - 2007 Mar 16
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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