Photoelectrochemical responses of optically transparent electrodes modified with Langmuir-Blodgett films consisting of surfactant derivatives of electron donor, acceptor and sensitizer molecules

Fujihira, Masamichi; Nishiyama, Katsuhiko; Yamada, Hideaki

doi:10.1016/0040-6090(85)90459-6

Cited by 196 publications

(53 citation statements)

References 25 publications

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“…However, considering efficient conversion of the resulting chargeseparated state into electrical or chemical energies, it is essential to arrange porphyrin-fullerene-linked molecules unidirectionally in organized media. Although Langmuir-Blodgett and lipid bilayer membranes have been frequently employed for the molecular organization, [138][139][140][141][142][143][144][145][146] instability and defects in the artificial membranes have limited successful development of the light energy conversion systems (internal quantum yield < 10%). We have focused on self-assembled monolayers (SAMs) 147,148 as a new methodology for molecular assembly.…”

Section: Self-assembled Monolayers Of Porphyrinfullerene-linked Systementioning

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: Self-assembled Monolayers Of Porphyrinfullerene-linked Systementioning

confidence: 99%

Creation of Fullerene-Based Artificial Photosynthetic Systems

Imahori¹

2007

Bulletin of the Chemical Society of Japan

156

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“…LB multilayers, ''doped'' with interspersed electron donors, then covered by insulating LB monolayers, then covered by LB multilayers ''doped'' with electron acceptors also form rectifiers, as was demonstrated by Kuhn and co-workers (123), and confirmed by others (124,125). An electrochemical L-B photodiode has been produced (126). Electrochemical rectification at a monolayer-modified electrode has been reported (127,128).…”

Section: Other Rectifier Resultsmentioning

confidence: 87%

Monolayer Rectifiers

Metzger

2002

Journal of Solid State Chemistry

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Molecular-scale electronics has now been enriched by the discovery that molecules, studied singly by scanning tunneling spectroscopy, or a large array of those molecules, studied in parallel as a Langmuir-Blodgett monolayer between metal electrodes, exhibit rectification, i.e., an asymmetric current as a function of applied voltage.This asymmetry can come, first, from work function differences between two dissimilar metals or the metal-molecule interfaces (Schottky barriers), second from an asymmetric placement of the chromophore between the two metal electrodes, and third, from an asymmetry of the molecular orbitals of the molecule.This third, electronic origin of rectification, first proposed by Aviram and Ratner in 1974, and confirmed in the work reported here, gives us hope that, not too many years from now, molecules can form the basis of ultra-small yet ultra-fast electronic devices and integrated circuits. # 2002 Elsevier Science (USA)

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“…Rectification has been achieved in a multilayer stack of oriented molecules [90] that was prepared by the Langmuir-Blodgett (LB) technique [91,92]. Subsequently a LB monolayer acting as photodiode was obtained [93]. This result indicated that single molecule devices are indeed realizable.…”

Section: Polymer Electronicsmentioning

confidence: 76%

Molecular Information Technology

Zauner

2005

Critical Reviews in Solid State and Materials Sciences

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ABSTRACT:Molecular materials are endowed with unique properties of unrivaled potential for high density integration of computing systems. Present applications of molecules range from organic semiconductor materials for low-cost circuits to genetically modified proteins for commercial imaging equipment. To fully realize the potential of molecules in computation, information processing concepts that relinquish narrow prescriptive control over elementary structures and functions are needed, and self-organizing architectures have to be developed. Investigations into qualitatively new concepts of information processing are underway in the areas of reaction-diffusion computing, self-assembly computing, and conformation-based computing. Molecular computing is best considered not as competitor for conventional computing, but as an opportunity for new applications. Microrobotics and bioimmersive computing are among the domains likely to benefit from advances in molecular computing. Progress will depend on both novel computing concepts and innovations in materials. This article reviews current directions in the use of bulk and single molecules for information processing. KEY WORDS:polymer electronics, molecular switches, self-assembly computing, conformation-based computation, self-organizing materials, bioimmersive computing

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Photoelectrochemical responses of optically transparent electrodes modified with Langmuir-Blodgett films consisting of surfactant derivatives of electron donor, acceptor and sensitizer molecules

Cited by 196 publications

References 25 publications

Creation of Fullerene-Based Artificial Photosynthetic Systems

Creation of Fullerene-Based Artificial Photosynthetic Systems

Monolayer Rectifiers

Molecular Information Technology

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