title: Vectorial electron relay at ITO electrodes modified with self-assembled monolayers of ferrocene-porphyrin-fullerene triads and porphyrin-fullerene Dyads for molecular photovoltaic devices.
abstract: Systematic series of indium tin oxide (ITO) electrodes modified covalently with self-assembled monolayers (SAMs) of ferrocene-porphyrin-fullerene triads and porphyrin-fullerene dyads were designed to gain valuable insight into the development of molecular photovoltaic devices. The structures of SAMs on ITO have been investigated by UV/Vis absorption spectroscopy, atomic force microscopy, and cyclic voltammetry. The photoelectrochemical and photophysical (fluorescence lifetime and time-resolved transient absorption) properties were also determined. The highest quantum yield of photocurrent generation (11 %) among donor-acceptor linked systems which are covalently attached to the surface of ITO electrodes was achieved with SAMs of ferrocene-zinc porphyrin-fullerene linked triad on ITO electrodes. The quantum yields of photocurrent generation correlate well with the charge-separation efficiency and the lifetime of the charge-separated state of the porphyrin-fullerene linked systems in solution. These results provide valuable information for the construction of photonic molecular devices and artificial photosynthetic systems on ITO electrodes.
authors.affiliation: Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, PRESTO, Japan Science and Technology Agency, Nishikyo-ku, Kyoto 615-8510, Japan. imahori@scl.kyoto-u.ac.jp <imahori@scl.kyoto-u.ac.jp>
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Imahori
authors.forename: Makoto
authors.initials: M
authors.lastname: Kimura
authors.forename: Kohei
authors.initials: K
authors.lastname: Hosomizu
authors.forename: Tomoo
authors.initials: T
authors.lastname: Sato
authors.forename: Tae Kyu
authors.initials: TK
authors.lastname: Ahn
authors.forename: Seong Keun
authors.initials: SK
authors.lastname: Kim
authors.forename: Dongho
authors.initials: D
authors.lastname: Kim
authors.forename: Yoshinobu
authors.initials: Y
authors.lastname: Nishimura
authors.forename: Iwao
authors.initials: I
authors.lastname: Yamazaki
authors.forename: Yasuyuki
authors.initials: Y
authors.lastname: Araki
authors.forename: Osamu
authors.initials: O
authors.lastname: Ito
authors.forename: Shunichi
authors.initials: S
authors.lastname: Fukuzumi