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Unusually High Performance Photovoltaic Cell Based on a [60]Fullerene Metal Cluster−Porphyrin Dyad SAM on an ITO Electrode

2005; American Chemical Society; Volume: 127; Issue: 8 Linguagem: Inglês

10.1021/ja044847x

1943-2984

Youn-Jaung Cho, Tae Kyu Ahn, Hyunjoon Song, Kil Suk Kim, Chang Yeon Lee, Won Seok Seo, Kwangyeol Lee, Seong Keun Kim, Dongho Kim, Joon T. Park,

Porphyrin and Phthalocyanine Chemistry

A self-assembled monolayer (SAM) of a C60−triosmium cluster complex Os3(CO)7(CNR)(CNR')(μ3-η2:η2:η2-C60) (ZnP−C60; R = (CH2)3Si(OEt)3, R' = ZnP) on an ITO surface exhibits ideal electrochemical responses as well as remarkable enhancement of the photocurrent generation. The diazabicyclooctane (DABCO) binding (ZnP)−C60/ITO/AsA/Pt cell shows the highest photocurrent generation quantum yield (19.5%) ever reported for the molecular photovoltaic cells based on the covalently linked donor−acceptor dyad structures. The high efficiency in photocurrent generation is ascribed to an efficient electron transfer from photoexcited porphyrin to fullerene, revealed by fluorescence lifetime measurements and transient absorption decay profiles. These results provide valuable information on the new strategy for the construction of molecular photonic devices and artificial photosynthetic systems on ITO electrodes.