Transparent-Conducting-Oxide Nanowire Arrays for Efficient Photoelectrochemical Energy Conversion
- Transparent-Conducting-Oxide Nanowire Arrays for Efficient Photoelectrochemical Energy Conversion
- 박상백; 이상욱; 한길상; 김동회; 노준홍; 조인선; 정현석; 홍국선
- Issue Date
- VOL 6, NO 15-8655
- We report one dimensional (1-D) transparent-conducting-oxide arrays coated with light-absorbing semiconductors to simultaneously maximize light harvesting and charge collection in a photoelectrochemical (PEC) system. Tin-doped indium oxide (ITO) nanowire (NW) arrays are prepared on ITO thin-film substrates as the transparent-conducting-oxide, and TiO2 or CdSe/CdS/TiO2 thin layers were coated on the ITO NW arrays as the solar light-absorbing layers. The optimal PEC performance, 0.85% under 100 mW cm(-2) of light illumination, is obtained from similar to 30 mu m-long ITO NW, which is covered with similar to 20 nm-thick TiO2 nanoshell. We finally demonstrate that the ITO NW-based photoelectrode is also compatible with one of the most efficient visible-light sensitizers, the CdS/CdSe quantum dot. Our approach using the transparent conducting 1-D array has wide potential to improve the PEC performances of conventional semiconducting materials through liberation from the poor charge transport.
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