Graphene-based electrodes for enhanced organic thin film transistors based on pentacene

Sarbani Basu, Mu Chen Lee, Yeong Her Wang

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

This paper presents 6,13-bis(triisopropylsilylethynyl)pentacene (TIPS-pentacene) and pentacene-based organic thin film transistors (OTFTs) with monolayer graphene source-drain (S-D) electrodes. The electrodes are patterned using conventional photolithographic techniques combined with reactive ion etching. The monolayer graphene film grown by chemical vapor deposition on Cu foil was transferred on a Si dioxide surface using a polymer-supported transfer method to fabricate bottom-gate, bottom-contact OTFTs. The pentacene OTFTs with graphene S-D contacts exhibited superior performance with a mobility of 0.1 cm2 V-1 s-1 and an on-off ratio of 105 compared with OTFTs with Au-based S-D contacts, which had a mobility of 0.01 cm2 V-1 s-1 and an on-off ratio of 103. The crystallinity, grain size, and microscopic defects (or the number of layers of graphene films) of the TIPS-pentacene/pentacene films were analyzed by X-ray diffraction spectroscopy, atomic force microscopy, and Raman spectroscopy, respectively. The feasibility of using graphene as an S-D electrode in OTFTs provides an alternative material with high carrier injection efficiency, chemical stability, and excellent interface properties with organic semiconductors, thus exhibiting improved device performance of C-based electronic OTFTs at a reduced cost.

Original languageEnglish
Pages (from-to)16701-16710
Number of pages10
JournalPhysical Chemistry Chemical Physics
Volume16
Issue number31
DOIs
Publication statusPublished - 2014 Jul 16

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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