Controlled solution deposition and systematic study of charge-transport anisotropy in single crystal and single-crystal textured TIPS pentacene thin films

Jihua Chen, Chee Keong Tee, Max Shtein, David C. Martin, John Anthony

Research output: Contribution to journalArticlepeer-review

95 Scopus citations

Abstract

In this work, bis-(triisopropylsilylethynyl) pentacene (TIPS pentacene) films were fabricated with a newly designed system for controlled solution casting with adjustable nitrogen flow and deposition temperature, which consequently enabled a systematic examination of crystal orientation-dependent mobilities in single crystal and single-crystal textured TIPS pentacene transistors. One of the two π-π stacking directions in TIPS pentacene films was found to be close to [2 1 0] (or the long axis of needle-shaped TIPS pentacene films), with frequent twinning observed between crystalline domains across the (1 over(2, -) 0) planes that are the lateral facets for individual crystallites. The [2 1 0] axes of crystalline TIPS pentacene thin films ran across source-drain channels at different angles, showing a ten-fold hole mobility increase as the [2 1 0] crystallographic axis became parallel to the channel direction. Our results also suggest that the controlled solution casting may be a promising method in fabricating solution-processible small-molecule organic semiconductors with varied morphologies.

Original languageEnglish
Pages (from-to)696-703
Number of pages8
JournalOrganic Electronics
Volume10
Issue number4
DOIs
StatePublished - Jul 2009

Bibliographical note

Funding Information:
The authors thank the Office of Naval Research and the National Science Foundation for financial supports (DMR-0084304 and DMR-6518079). TEM studies and electrical characterizations were conducted in the Electron Microbeam Analysis Laboratory and Solid State Electronics Laboratory at the University of Michigan at Ann Arbor.

Keywords

  • Charge-transport anisotropy
  • Controlled solution process
  • Functionalized pentacene
  • Twin boundary

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Chemistry (all)
  • Condensed Matter Physics
  • Materials Chemistry
  • Electrical and Electronic Engineering

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