Transparent-conducting-oxide nanowire arrays for efficient photoelectrochemical energy conversion
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.
Royal Society of Chemistry
National Research Foundation of Korea (NRF) - Korean government (MEST) [2012M3A6A7054861, 2012M3A7B4049967]; Basic Science Research program - Ministry of Science, ICT & Future Planning [NRF-2014R1A4A1008474]; National Research Foundation of Korea - Korean Government (MEST) [NRF 357-2011-1-D00111]