TiO2 nanocrystals shell layer on highly conducting indium tin oxide nanowire for photovoltaic devices

Hyun Soo Han, Ju Seong Kim, Dong Hoe Kim, Gil Sang Han, Hyun Suk Jung, Jun Hong Noh, Kug Sun Hong

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Abstract

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 ∼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°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.

Original languageEnglish
Pages (from-to)3520-3526
Number of pages7
JournalNanoscale
Volume5
Issue number8
DOIs
Publication statusPublished - 2013 Apr 21
Externally publishedYes

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ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Han, H. S., Kim, J. S., Kim, D. H., Han, G. S., Jung, H. S., Noh, J. H., & Hong, K. S. (2013). TiO2 nanocrystals shell layer on highly conducting indium tin oxide nanowire for photovoltaic devices. Nanoscale, 5(8), 3520-3526. https://doi.org/10.1039/c3nr33153a