Synthesis and physical properties of brominated hexacene and hole-transfer properties of thin-film transistors

Motonori Watanabe, Takaaki Miyazaki, Toshinori Matsusima, Junko Matsuda, Ching Ting Chein, Masahiko Shibahara, Chihaya Adachi, Shih Sheng Sun, Tahsin J. Chow, Tatsumi Ishihara

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

A halide-substituted higher acene, 2-bromohexacene, and its precursor with a carbonyl bridge moiety were synthesized. The precursor was synthesized through 7 steps in a total yield of 2.5%. The structure of precursor and thermally converted 2-bromohexacene were characterized by solid state NMR, IR, and absorption spectra, as well as by DFT computation analysis. It exhibited high stability in the solid state over 3 months, therefore can be utilized in the fabrication of opto-electronic devices. The organic thin-film transistors (OFETs) were fabricated by using 2-bromohexacene and parent hexacene through vaccum deposition method. The best film mobility of 2-bromohexacene was observed at 0.83 cm2 V-1 s-1 with an on/off ratio of 5.0 × 104 and a threshold of -52 V, while the best film mobility of hexacene was observed at 0.076 cm2 V-1 s-1 with an on/off ratio of 2.4 × 102 and a threshold of -21 V. AFM measurement of 2-bromohexacene showed smooth film formation. The averaged mobility of 2-bromohexacene is 8 fold higher than the non-substituted hexacene.

Original languageEnglish
Pages (from-to)13259-13265
Number of pages7
JournalRSC Advances
Volume8
Issue number24
DOIs
Publication statusPublished - Jan 1 2018

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Thin film transistors
Physical properties
Organic field effect transistors
Discrete Fourier transforms
Optoelectronic devices
Absorption spectra
Nuclear magnetic resonance
Fabrication

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)

Cite this

Synthesis and physical properties of brominated hexacene and hole-transfer properties of thin-film transistors. / Watanabe, Motonori; Miyazaki, Takaaki; Matsusima, Toshinori; Matsuda, Junko; Chein, Ching Ting; Shibahara, Masahiko; Adachi, Chihaya; Sun, Shih Sheng; Chow, Tahsin J.; Ishihara, Tatsumi.

In: RSC Advances, Vol. 8, No. 24, 01.01.2018, p. 13259-13265.

Research output: Contribution to journalArticle

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AU - Chein, Ching Ting

AU - Shibahara, Masahiko

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AU - Ishihara, Tatsumi

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