Photovoltaics of photoactive protein/polypeptide LB films

Hiroyuki Sasabe, Taiji Furuno, Kiyoshi Takimoto

研究成果: Article査読

13 被引用数 (Scopus)


Two types of photovoltaic cells prepared by LB films of photoactive protein and/or polypeptide were investigated; i.e., the one is of bacteriorhodopsin (bR) which has an "intrinsic" proton pump (Cell-1), and the other is of polypeptide with carbazoyl group which has a high efficiency in photocarrier generation (Cell-2). In case of Cell-1 the monolayer of purple membrane (2-D crystal of bR) was transferred onto the ITO glass substrate by a horizontal transfer technique. The photovoltaic current Ipv flows from Al to ITO electrodes and depends on the depolarization due to the photophysical cycle of bR. The quantum efficiency of bR is quite high compared to the commodity polymers. In case of Cell-2 the formation of Schottky barrier between Al electrode and polypeptide multi-layer and the photocarrier (hole) injection from Al electrode are essential to the photovoltaic effect. Since Ipv strongly depends on the conductivity of polymer layer, the alignment of carbazole groups in 1-D and/or the formation of interdigited column structure with acceptor moety (CT complex) are desirable for the conduction enhancement. For the comparison with protein photoactive cells, phthalocyanine derivatives were also investigated as insulator layers of MIM type cells: The one is an LB film of alkoxy phthalocyanine (APc) and the other is a Ni-Pc thin film formed by molecular beam epitaxy technique (MBE-Pc).

ジャーナルSynthetic Metals
出版ステータスPublished - 1989 1月 30

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学
  • 材料力学
  • 機械工学
  • 金属および合金
  • 材料化学


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