Optical Absorption, Photoelectrochemical, and Ultrafast Carrier Dynamic Investigations of TiO2 Electrodes Composed of Nanotubes and Nanowires Sensitized with CdSe Quantum Dots

概要

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TiO2 electrodes composed of nanotubes and nanowires are prepared from TiO2 gels using a surfactant-assisted self-assembly method reported earlier. CdSe quantum dots (QDs) are adsorbed onto the TiO2 electrodes by chemical deposition (CD). Their average size increases from 4 to 6 nm with increasing deposition time from 3 to 82 h. The optical absorption and incident photon-to-current conversion efficiency (IPCE) of the electrodes are studied by photoacoustic (PA) and photoelectrochemical (PEC) methods. The photosensitization of the TiO2 electrodes by CdSe QDs is demonstrated by both PA and IPCE spectra. The ultrafast carrier dynamics of the CdSe-sensitized TiO2 electrodes composed of nanotubes and nanowires is studied using a lens-free heterodyne detection transient grating (LF-HD-TG) technique. Fast and slow decay processes with lifetimes of about 3 ps and 60–130 ps, respectively, are observed.
Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
2006-06-30