Photovoltaic properties of self-assembled monolayers of porphyrins and porphyrin-fullerene dyads on ITO and gold surfaces

被引:249
作者
Yamada, H
Imahori, H
Nishimura, Y
Yamazaki, I
Ahn, TK
Kim, SK
Kim, D
Fukuzumi, S
机构
[1] Osaka Univ, Dept Mat & Life Sci, Grad Sch Engn, CREST,Japan Sci & Technol Corp, Suita, Osaka 5650871, Japan
[2] Kyoto Univ, Dept Mol Engn, Grad Sch Engn, PRESTO,Japan Sci & Technol Corp, Kyoto 6158510, Japan
[3] Kyoto Univ, Fukui Inst Fundamental Chem, Sakyo Ku, Kyoto 6068103, Japan
[4] Hokkaido Univ, Dept Mol Chem, Grad Sch Engn, Sapporo, Hokkaido 0608628, Japan
[5] Yonsei Univ, Dept Chem, Ctr Ultrafast Opt Characterist Control, Seoul 120749, South Korea
[6] Seoul Natl Univ, Sch Chem, Seoul 151747, South Korea
关键词
D O I
10.1021/ja034913f
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
A systematic series of ITO electrodes modified chemically with self-assembled monolayers (SAMS) of porphyrins and porphyrin-fullerene dyads have been designed to provide valuable insight into the development of artificial photosynthetic devices. First the ITO and gold electrodes modified chemically with SAMs of porphyrins with a spacer of the same number of atoms were prepared to compare the effects of energy transfer (EN) quenching of the porphyrin excited singlet states by the two electrodes. Less EN quenching was observed on the ITO electrode as compared to the EN quenching on the corresponding gold electrode, leading to remarkable enhancement of the photocurrent generation (ca. 280 times) in the porphyrin SAMS on the ITO electrode in the presence of the triethanolamine (TEA) used as a sacrificial electron donor. The porphyrin (H2P) was then linked with C-60 which can act as an electron acceptor to construct H2P-C-60 SAMS on the ITO surface in the presence of hexyl viologen (HV2+) used as an electron carrier in a three electrode system, denoted as ITO/H2P-C-60/HV2+/Pt. The quantum yield of the photocurrent generation of the ITO/H2P-C-60/HV2+/Pt system (6.4%) is 30 times larger than that of the corresponding system without C-60: ITO/H2P-ref/HV2+/Pt (0.21%). Such enhancement of photocurrent generation in the porphyrin-fullerene dyad system is ascribed to an efficient photoinduced ET from the porphyrin singlet excited state to the C-60 moiety as indicated by the fluorescence lifetime measurements and also by time-resolved transient absorption studies on the ITO systems. The surface structures of H2P and H2P-C-60 SAMS on ITO (H2P/ITO and H2P-C-60/ITO) have been observed successfully in molecular resolution with atomic force microscopy for the first time.
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收藏
页码:9129 / 9139
页数:11
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