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Please use this identifier to cite or link to this item: http://hdl.handle.net/10119/7906

Title: Nanostructured assembly of porphyrin clusters for light energy conversion
Authors: Hasobe, Taku
Imahori, Hiroshi
Fukuzumi, Shunichi
Kamat, Prashant V.
Issue Date: 2003
Publisher: Royal Society of Chemistry
Magazine name: Journal of Materials Chemistry
Volume: 13
Number: 10
Start page: 2515
End page: 2520
DOI: 10.1039/b306871d
Abstract: Free base porphyrin molecules form well-defined and ordered nanoclusters in mixed solvents with absorption characteristics that significantly differ from those of the monomer form. These self-assembled crystallites in acetonitrile/toluene (9:1, v/v) can be deposited as thin films on a nanostructured TiO_2 electrode using an electrophoretic technique. This porphyrin cluster assembly is highly photoactive and capable of undergoing charge separation under visible light excitation. Photoexcitation of the porphyrin film electrode assembly in a photoelectrochemical cell with visible light produces relatively high photocurrent generation. A maximum photocurrent of 0.15 mA cm^<–2> and a photovoltage of 250 mV were attained using the I_3^–/I^– redox couple. The electron flow to the TiO_2 electrode can be facilitated by application of a positive potential. An incident photon-to-photocurrent generation efficiency (IPCE) of 2.0% has been achieved at an applied bias potential of 0.2 V vs. SCE. The broad photoresponse of these crystallites throughout the visible range as well as the ease of assembling them on the electrode surface opens up new avenues for harvesting a wide wavelength range of solar light.
Rights: Copyright (C) 2003 Royal Society of Chemistry. Taku Hasobe, Hiroshi Imahori, Shunichi Fukuzumi and Prashant V. Kamat, Journal of Materials Chemistry, 13(10), 2003, 2515-2520. http://dx.doi.org/10.1039/b306871d - Reproduced by permission of The Royal Society of Chemistry
URI: http://hdl.handle.net/10119/7906
Material Type: author
Appears in Collections:c10-1. 雑誌掲載論文 (Journal Articles)

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