Porphyrin‐ and Fullerene‐Based Molecular Photovoltaic Devices

Imahori, Hiroshi; Fukuzumi, Shunichi

doi:10.1002/adfm.200305172

Cited by 462 publications

(285 citation statements)

References 77 publications

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“…16,17,107,118 First, supramolecular complex of porphyrin and fullerene is formed in toluene [denoted as (16 + C 60 ) m ] due to the -interaction (step 1). Then, the supramolecular complex is self-assembled into larger clusters in a mixture of toluene and acetonitrile due to lyophobic interaction between the complex and the mixed solvent (step 2).…”

Section: ·-mentioning

confidence: 99%

Creation of Fullerene-Based Artificial Photosynthetic Systems

Imahori¹

2007

Bulletin of the Chemical Society of Japan

156

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Various porphyrin-fullerene-linked systems have been prepared to elucidate the intrinsic electron-transfer properties of fullerenes. Photodynamical studies on porphyrin-fullerene-linked systems showed that spherical fullerenes accelerated photoinduced electron transfer and charge-shift, but slowed down charge recombination, which is in sharp contrast with those of conventional planar acceptors such as quinones and imides. For the first time, it was shown that the unique electron-transfer properties result from the small reorganization energies of fullerenes arising from the delocalized system on the sphere together with the rigid structure. The small reorganization energies make it possible to produce a long-lived charge-separated state with a high quantum yield in donor-fullerene systems. The finding also will allow us to construct light energy conversion systems as well as artificial photosynthetic models. Highly efficient photoinduced energy and electron transfer were achieved on gold and ITO electrodes modified with self-assembled monolayers of the porphyrin-fullerene-linked systems. We also developed dye-sensitized bulk heterojunction solar cell possessing both characteristics of dye-sensitized and bulk heterojunction solar cells. These results showed the advantages of fullerenes as electron acceptors in artificial photosynthetic model, photonic molecular devices and machines, and organic molecular electronics including solar cells.

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Section: ·-mentioning

confidence: 99%

Creation of Fullerene-Based Artificial Photosynthetic Systems

Imahori¹

2007

Bulletin of the Chemical Society of Japan

156

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“…17 The extraordinary electron acceptor properties have resulted in noteworthy advances in the research areas of light-induced electron transfer and solar energy conversion. [18][19][20][21] Therefore, the hybridization of C 60 with SWCNTs 5,7,[22][23][24][25][26][27] would couple the optical and electronic properties of SWCNTs together with the electron-acceptor feature of C 60 . Covalent modification is one of the strategies for the attachment of C 60 onto sidewall of SWCNT.…”

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confidence: 99%

Assembly of carbon nanotubes and alkylated fullerenes: nanocarbon hybrid towards photovoltaic applications

et al. 2011

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Taking advantage of the non-covalent interaction between alkyl chains and the sidewalls of a singlewalled carbon nanotube (SWCNT), a nanocarbon hybrid of SWCNT and a fullerene (C 60 ) derivative with long alkyl chains was constructed as a donor-acceptor pair for photovoltaics and nanodevice investigations. It was found that SWCNT could be mostly unbundled by the alkylated C 60 (1) and was well-dispersed in organic solvents. As a photoactive material, the resultant nanocarbon hybrid, 1-SWCNT, performed well in light-energy harvesting applications in photoelectrochemical cells and nanoscale field-effect transistors (FET). Moreover, the 1-SWCNT assembly exhibited superhydrophobicity, providing an interesting opportunity to fabricate nanocarbon-based waterproof optoelectronic devices. In order to understand the photoexcitation process, the 1-SWCNT assembly was electrochemically and spectroscopically characterized. The electrochemical results showed that the SWCNT facilitated electronic communication between 1 and the electrode. The steady-state and timeresolved fluorescence and the photoluminescence excitation studies suggested efficient quenching of the singlet excited state of C 60 . Nanosecond transient absorption data revealed the one-electron reduction of fullerene, C 60 _ À , thereby demonstrating the photoinduced electron transfer from SWCNT to the C 60 unit in the 1-SWCNT assembly.

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“…These combinations can result in enhanced electron and energy transfer [52]. The ability to capture fullerenes depends on the metal atoms of the macrocycle.…”

Section: Cofacial Dimersmentioning

confidence: 99%

Structural Aspects of Porphyrins for Functional Materials Applications

2017

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Porphyrinic compounds comprise a diverse group of materials which have in common the presence of one or more cyclic tetrapyrroles known as porphyrins in their molecular structures. The resulting aromaticity gives rise to the semiconducting properties that make these compounds of interest for a broad range of applications, including artificial photosynthesis, catalysis, molecular electronics, sensors, non-linear optics, and solar cells. In this brief review, the crystallographic attributes of porphyrins are emphasized. Examples are given showing how the structural orientations of the porphyrin macrocycle, and the inter-porphyrin covalent bonding present in multiporphyrins influence the semiconducting properties. Beginning with porphine, the simplest porphyrin, we discuss how the more complex structures that have been reported are described by adding peripheral substituents and internal metalation to the macrocycles. We illustrate how the conjugation of the π-bonding, and the presence of electron donor/acceptor pairs, which are the basis for the semiconducting properties, are affected by the crystallographic topology.

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Porphyrin‐ and Fullerene‐Based Molecular Photovoltaic Devices

Cited by 462 publications

References 77 publications

Creation of Fullerene-Based Artificial Photosynthetic Systems

Creation of Fullerene-Based Artificial Photosynthetic Systems

Assembly of carbon nanotubes and alkylated fullerenes: nanocarbon hybrid towards photovoltaic applications

Structural Aspects of Porphyrins for Functional Materials Applications

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