Ionic Conduction and Photoisomerization in Azobenzene Langmuir-Blodgett Films Adsorbing Cyanine Dyes.

  • Shinbo Kazunari
    Graduate School of Science and Technology, Niigata University, Ikarashi 2–8050, Niigata 950–21, Japan
  • Kontani Tadashi
    Graduate School of Science and Technology, Niigata University, Ikarashi 2–8050, Niigata 950–21, Japan
  • Watanabe Mitsuhiro
    Department of Electrical and Electronic Engineering, Niigata University, Ikarashi 2–8050, Niigata 950–21, Japan
  • Fukami Tetsuo
    Graduate School of Science and Technology, Niigata University, Ikarashi 2–8050, Niigata 950–21, Japan
  • Kato Keizo
    Graduate School of Science and Technology, Niigata University, Ikarashi 2–8050, Niigata 950–21, Japan
  • Kaneko Futao
    Department of Electrical and Electronic Engineering, Niigata University, Ikarashi 2–8050, Niigata 950–21, Japan
  • Kobayashi Satoshi
    Department of Material Science and Technology, Niigata University, Ikarashi 2–8050, Niigata 950–21, Japan

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タイトル別名
  • Ionic Conduction and Photoisomerization

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抄録

Azobenzene (Az) Langmuir-Blodgett (LB) films adsorbing cyanine dyes (NK-3) were deposited and the electrical properties were investigated in detail. The current vs electric field characteristics suggested ionic hopping conduction, and the transient current properties showed current peaks due to migration of mobile ions. The thermally stimulated currents (TSCs) were also due to the ionic space charge polarization, that is, displacement of mobile ions over long distances in the LB films. These results indicated that the electrical properties of the Az LB devices are strongly dependent on the mobile ions in the devices. In addition, the TSC and the short-circuit photocurrent properties due to the dyes were also changed by isomerization of the Az molecules. The results showed that the ionic space charge polarization and the aggregates of the dyes were affected by the isomerization.

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