Characterization and evaluation of role of porphyrin moiety in meso-tetrathienylporphyrin-polythiophene composite film

Kosuke Sugawa, Keitaro Kakutani, Tsuyoshi Akiyama, Sunao Yamada, Kensuke Takechi, Tohru Shiga, Tomoyoshi Motohiro, Hideki Nakayama, Keiichi Kohama

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9 Citations (Scopus)

Abstract

Porphyrin-polythiophene (pTh) composite films consisting of meso-tetrathienylporphyrin (TThP) and 2,2'-bithiophene (BiTh) were fabricated on transparent indium-tin-oxide (ITP) electrodes by the electrochemical polymerization of TThP and BiTh in solution. The incorporation of a porphyrin moiety to the pTh chain was confirmed by absorption and X-ray photoelectron spectroscopies. In the case of tetraphenylporphyrin (TPP), instead of TThP for electrochemical polymerization, no clear evidence of the incorporation of the porphyrin moiety into the pTh chain was obtained. In the presence of methylviologen and oxygen as electron acceptors, light irradiation on the TThP-pTh composite films generated stable cathodic photocurrents. A broad peak at approximately 420 nm corresponding to the Soret band of the porphyrin moiety was clearly observed in the photocurrent action spectrum of the TThP-pTh composite films. The photocurrent intensity of the TThP-pTh composite films was larger than that of the pTh film. The incorporation of TThP to the composite films was quite effective for generating larger photocurrents.

Original languageEnglish
Pages (from-to)2632-2635
Number of pages4
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume46
Issue number4 B
DOIs
Publication statusPublished - Apr 24 2007

All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Physics and Astronomy(all)

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