Optical Absorption, Photoelectrochemical, and Ultrafast Carrier Dynamic Investigations of TiO2 Electrodes Composed of Nanotubes and Nanowires Sensitized with CdSe Quantum Dots
- 1 June 2006
- journal article
- Published by IOP Publishing in Japanese Journal of Applied Physics
- Vol. 45 (6S), 5569
- https://doi.org/10.1143/jjap.45.5569
Abstract
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.Keywords
This publication has 27 references indexed in Scilit:
- High Efficiency Carrier Multiplication in PbSe Nanocrystals: Implications for Solar Energy ConversionPhysical Review Letters, 2004
- Characterization of Nanostructured TiO2 Electrodes Sensitized with CdSe Quantum Dots Using Photoacoustic and Photoelectrochemical Current MethodsJapanese Journal of Applied Physics, 2004
- Photosensitization of nanostructured TiO2 with CdSe quantum dots: effects of microstructure and electron transport in TiO2 substratesJournal of Photochemistry and Photobiology A: Chemistry, 2004
- Dye-sensitized solar cellsJournal of Photochemistry and Photobiology C: Photochemistry Reviews, 2003
- Photoacoustic and Photoelectrochemical Current Response of Nanostructured TiO2ElectrodesJapanese Journal of Applied Physics, 2003
- Formation of Titania Nanotubes and Applications for Dye-Sensitized Solar CellsJournal of the Electrochemical Society, 2003
- Effect of sensitization by quantum-sized CdS on photoacoustic and photoelectrochemical current spectra of porous TiO2 electrodesReview of Scientific Instruments, 2003
- Charge carrier dynamics in CdSe nanocrystals: implications for the use of quantum dots in novel photovoltaicsThe European Physical Journal D, 2001
- Photoacoustic and Photocurrent Studies of Highly Porous TiO2 Electrodes Sensitized by Quantum-Sized CdSJapanese Journal of Applied Physics, 1999
- Picosecond dynamics of surface electron transfer processes: Surface restricted transient grating studies of the n-TiO2/H2O interfaceThe Journal of Chemical Physics, 1989