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Please use this identifier to cite or link to this item: http://hdl.handle.net/10119/7909

Title: Organic solar cells. Supramolecular composites of porphyrins and fullerenes organized by polypeptide structures as light harvesters
Authors: Hasobe, Taku
Saito, Kenji
Kamat, Prashant V.
Troiani, Vincent
Qiu, Hongjin
Nathalie, Solladi
Kim, Kil Suk
Park, Jong Kang
Kim, Dongho
D'Souza, Francis
Fukuzumi, Shunichi
Issue Date: 2007
Publisher: Royal Society of Chemistry
Magazine name: Journal of Materials Chemistry
Volume: 17
Number: 39
Start page: 4160
End page: 4170
DOI: 10.1039/b706678c
Abstract: We have constructed supramolecular solar cells composed of a series of porphyrin–peptide oligomers [porphyrin functionalized α-polypeptides: P(H_2P)_n or P(ZnP)_n (n = 1, 2, 4, 8, 16)] and fullerene assembled on a nanostructured SnO_2 electrode using an electrophoretic deposition method. Remarkable enhancement in the photoelectrochemical performance as well as the broader photoresponse in the visible and near-infrared regions is seen with increasing the number of porphyrin units in α-polypeptide structures. Formation of supramolecular clusters of porphyrins and fullerenes prepared in acetonitrile/toluene = 3/1 has been confirmed by transmission electron micrographs (TEM) and the absorption spectra. The highly colored composite clusters of porphyrin–peptide oligomers and fullerenes have been assembled as three-dimensional arrays onto nanostructured SnO_2 films using an electrophoretic deposition method. A high power conversion efficiency (η) of 1.6% and the maximum incident photon-to-photocurrent efficiency (IPCE = 56%) were attained using composite clusters of free base and zinc porphyrin–peptide hexadecamers [P(H_2P)_<16> and P(ZnP)_<16>] with fullerenes, respectively. Femtosecond transient absorption and fluorescence measurements of porphyrin–fullerene composite films confirm improved electron-transfer properties with increasing number of porphyrins in a polypeptide unit. The formation of molecular assemblies between porphyrins and fullerenes with a polypeptide structure controls the electron-transfer efficiency in the supramolecular complexes, meeting the criteria required for efficient light energy conversion.
Rights: Copyright (C) 2007 Royal Society of Chemistry. Taku Hasobe, Kenji Saito, Prashant V. Kamat, Vincent Troiani, Hongjin Qiu, Nathalie Solladi, Kil Suk Kim, Jong Kang Park, Dongho Kim, Francis D'Souza, Shunichi Fukuzumi, Journal of Materials Chemistry, 17(39), 2007, 4160-4170. http://dx.doi.org/10.1039/b706678c - Reproduced by permission of The Royal Society of Chemistry
URI: http://hdl.handle.net/10119/7909
Material Type: author
Appears in Collections:c10-1. 雑誌掲載論文 (Journal Articles)

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