Ambipolar organic thin film transistor-like behavior of cationic and anionic phthalocyanines fabricated using layer-by-layer deposition from aqueous solution

Jason Locklin, Kazunari Shinbo, Ken Onishi, Futao Kaneko, Zhenan Bao, Rigoberto C. Advincula

Research output: Contribution to journalArticlepeer-review

115 Citations (Scopus)

Abstract

Organic thin film field effect transistors of water-soluble cationic and anionic phthalocyanine derivatives were successfully prepared using the layer-by-layer deposition technique. The alternating film growth and subsequent transistor properties were studied with a variety of techniques including ellipsometry, UV-vis spectroscopy, polarized UV-vis spectroscopy, AFM, and field effect transistor measurements. A stepwise and regular deposition of copper(II) phthalocyanine tetrakis(methyl pyridinium) chloride and copper(II) phthalocyanine tetrasulfonic acid, tetrasodium salt multilayers in both pure water and 0.03 M NaCl solution was observed. Differences in linear growth were observed between pure water and 0.03 M NaCl-based solutions. Polarized UV-vis spectra indicated that the conjugated phthalocyanine ring lies almost flat on the substrate surface with a random orientation within the plane of the substrate. Unusual "ambipolar" transistor-like behavior was found for the films that can be attributed to an ion-modulated electrical conduction mechanism, which relies on the assistance of mobile ions to stabilize the oxidized or reduced species in the channel region.

Original languageEnglish
Pages (from-to)1404-1412
Number of pages9
JournalChemistry of Materials
Volume15
Issue number7
DOIs
Publication statusPublished - 2003 Apr 8
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

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