Supramolecular photovoltaic cells based on composite molecular nanoclusters:: Dendritic porphyrin and C60, porphyrin dimer and C60, and Porphyrin-C60 dyad

被引:138
作者
Hasobe, T
Kamat, PV [1 ]
Absalom, MA
Kashiwagi, Y
Sly, J
Crossley, MJ
Hosomizu, K
Imahori, H
Fukuzumi, S
机构
[1] Univ Sydney, Sch Chem, Sydney, NSW 2006, Australia
[2] Osaka Univ, CREST, Japan Sci & Technol Agcy, Grad Sch Engn,Dept Mat & Life Sci, Suita, Osaka 5650871, Japan
[3] Univ Notre Dame, Radiat Lab, Notre Dame, IN 46556 USA
[4] Univ Notre Dame, Dept Chem & Biomol Engn, Notre Dame, IN 46556 USA
[5] Kyoto Univ, PRESTO, JST, Grad Sch Engn,Dept Mol Engn,Nishiyko Ku, Kyoto 6158510, Japan
[6] Kyoto Univ, Fukui Inst Fundamental Chem, Sakyo Ku, Kyoto 6068103, Japan
关键词
D O I
10.1021/jp048404r
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Novel organic solar cells have been prepared using molecular clusters of porphyrin dendrimer (donor) and fullerene (acceptor) dye units assembled on SnO2 electrodes. The molecular clusters of porphyrin with dendritic structure and fullerene exhibit controlled size and shape in contrast with the reference systems (a porphyrin dimer and a porphyrin-fullerene dyad) without dendritic structure in TEM images, which show rather irregular and smaller clusters. The composite molecular nanoclusters of dendritic porphyrin and fullerene prepared in acetonitrile/toluene mixed solvent absorb light over entire spectrum of visible light. The comparison of photoelectrochemical properties of composite molecular cluster of porphyrin and fullerene with that of molecular cluster of porphyrin-C-60 dyad with covalent linkage shows the importance of interpenetrating structure in each network to transport hole and electron efficiently. Furthermore, organic photovoltaic cells using clusters of supramolecular complexes of V-shaped porphyrin dimer and porphyrin dendrimers with fullerene exhibit remarkable enhancement in the photoelectrochemical performance as well as broader photoresponse in the visible and near-infrared regions as compared with the reference system. This clearly indicates that the pi-pi interaction between porphyrins and fullerenes in the supramolecular clusters plays an important role in improving the light energy conversion efficiency.
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页码:12865 / 12872
页数:8
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