Fabrication of photodiode arrays by molecular assembly technique

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  • Mitsuru Yoneyama
    Mitsubishi Kasei Corporation, Research Center, 1000 Kamoshida-cho, Midori-ku, Yokohama 227, Japan
  • Akiteru Fujii
    Mitsubishi Kasei Corporation, Research Center, 1000 Kamoshida-cho, Midori-ku, Yokohama 227, Japan
  • Shuichi Maeda
    Mitsubishi Kasei Corporation, Research Center, 1000 Kamoshida-cho, Midori-ku, Yokohama 227, Japan
  • Tetsuo Murayama
    Mitsubishi Kasei Corporation, Research Center, 1000 Kamoshida-cho, Midori-ku, Yokohama 227, Japan

Abstract

<jats:p>Mixed monolayers of 5-(4-N-decylpyridinium)-10,15,20-tri-p-tolyl porphyrin (PyP) and arachidic acid (AA) were prepared on a water surface as a precursor for organized arrays of photodiodes. By compression and expansion of the films, PyP self-assembled to form nearly circular domains with their size dependent on the molar ratio of PyP and AA. These structures were successfully incorporated into Schottky-type cells, and their photoelectric properties were studied on the domain level by illumination of a focused light with a diameter of 20 μm. The short-circuit photocurrents showed large fluctuations depending on the position of illumination, which reveals that the PyP domains function as photodiode arrays.</jats:p>

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