Photovoltaic cells using composite nanoclusters of porphyrins and fullerenes with gold nanoparticles

Taku Hasobe, Hiroshi Imahori, Prashant V. Kamat, Kyu Ahn Tae, Keun Kim Seong, Dongho Kim, Atsushi Fujimoto, Tsutomu Hirakawa, Shunichi Fukuzumi

Research output: Contribution to journalArticlepeer-review

474 Scopus citations


Novel organic solar cells have been prepared using quaternary self-organization of porphyrin (donor) and fullerene (acceptor) units by clusterization with gold nanoparticles on nanostructured SnO2 electrodes. First, porphyrin-alkanethiolate monolayer-protected gold nanoparticles (H2PCnMPC: n is the number of methylene groups in the spacer) are prepared (secondary organization) starting from the primary component (porphyrin-alkanethiol). These porphyrin-modified gold nanoparticles form complexes with fullerene molecules (tertiary organization), and they are clusterized in acetonitrile/toluene mixed solvent (quaternary organization). The highly colored composite clusters can then be assembled as three-dimensional arrays onto nanostructured SnO2 films to afford the OTE/SnO 2/(H2PCnMPC+C60)m electrode using an electrophoretic deposition method. The film of the composite clusters with gold nanoparticle exhibits an incident photon-to-photocurrent efficiency (IPCE) as high as 54% and broad photocurrent action spectra (up to 1000 nm). The power conversion efficiency of the OTE/SnO2/(H2PC15MPC+C 60)m composite electrode reaches as high as 1.5%, which is 45 times higher than that of the reference system consisting of the both single components of porphyrin and fullerene.

Original languageEnglish
Pages (from-to)1216-1228
Number of pages13
JournalJournal of the American Chemical Society
Issue number4
StatePublished - 2 Feb 2005


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