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Proceedings Paper

Structure and photoelectrochemical properties of porphyrin-linked fullerenes on a gold surface using a self-assembled monolayer technique
Author(s): Hiroshi Imahori; Takayuki Azuma; Kiminori Ushida; Masao Takahashi; Tsuyoshi Akiyama; Masato Hasegawa; Tadashi Okada; Yoshiteru Sakata
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Paper Abstract

Self-assembled monolayers (SAMs) have recently attracted much attention as a new methodology among a variety of thin film preparation. There have been several reports of fullerene SAM. These fullerene thin films seem to be the most promising candidates for realizing photovoltaic and optoelectronic devices at the nano-scale level. We have applied this technique to donor-linked fullerene systems and have developed supramolecular porphyrin-C60 molecules that are designed to be self-assembled on gold surface. Such systems are expected to mimic supramolecular photoinduced charge-separation events in photosynthesis. Porphyrin-linked C60 bearing a methylthio group was prepared by 1,3- dipolar cycloaddition of the azomethine ylide porphyrin with C60. SAM was formed by soaking Au electrode into a CH2Cl2 solution of the porphyrin-C60 dyad. Structure of the SAM was investigated by spectroscopic methods including X-ray photoelectron spectroscopy and ellipsometry and electrochemical studies. The large photocurrent with a level of sub-(mu) A/cm2 was observed for the photochemical cell in the presence of methyl viologen under illumination with approximately 10 mW/cm2. Possible mechanism for the photocurrent generation is discussed in terms of the photodynamics of porphyrin-linked fullerenes.

Paper Details

Date Published: 1 November 1997
PDF: 8 pages
Proc. SPIE 3142, Fullerenes and Photonics IV, (1 November 1997); doi: 10.1117/12.279246
Show Author Affiliations
Hiroshi Imahori, Osaka Univ. (Japan)
Takayuki Azuma, Osaka Univ. (Japan)
Kiminori Ushida, RIKEN--The Institute of Physical and Chemical Research (Japan)
Masao Takahashi, Osaka Univ. (Japan)
Tsuyoshi Akiyama, Osaka Univ. (Japan)
Masato Hasegawa, Osaka Univ. (Japan)
Tadashi Okada, Osaka Univ. (Japan)
Yoshiteru Sakata, Osaka Univ. (Japan)

Published in SPIE Proceedings Vol. 3142:
Fullerenes and Photonics IV
Zakya H. Kafafi, Editor(s)

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