Journal
NANOSCALE
Volume 5, Issue 8, Pages 3520-3526Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3nr33153a
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Funding
- National Research Foundation of Korea (NRF)
- Korea government (MEST) [2012-0008669, 2011-0017210, R11-2005-048-00000-0]
- Global Frontier R&D Program on Center for Multiscale Energy System
- National Research Foundation under the Ministry of Education, Science and Technology, Korea [2011-0031574]
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We demonstrated a highly efficient conducting indium tin oxide (ITO) core-TiO2 nanocrystals shell nanowire array for a photoelectrode in dye-sensitized solar cells with regard to light harvest and charge collection. The TiO2 shell layer, consisting of anatase nanocrystals of similar to 2 nm,were successfully formed on a single crystalline ITO nanowire prepared via a vapor transport method using repetitive TiCl4 aqueous solution treatments at 50 degrees C. We found that the nanocrystal size and number of Cl- ions remaining on the formed shell layer critically influence the dye loading properties. Moreover, these factors can be controlled by means of a post-annealing process. We also found that the dye loading and the back electron transport from the conductive ITO nanowire to the electrolyte mainly determine the final cell performance. The proposed double-shell layer structure consisting of dense and porous layers showed significantly improved cell performance.
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