Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Anchoring Cadmium Chalcogenide Quantum Dots (QDs) onto Stable Oxide Semiconductors for QD Sensitized Solar Cells

  • Lee, Hyo-Joong (Department of Chemistry and Center for Integrated Molecular Systems, Pohang University of Science and Technology) ;
  • Kim, Dae-Young (On Leave from Department of Chemistry, Hallym University) ;
  • Yoo, Jung-Suk (Department of Chemistry and Center for Integrated Molecular Systems, Pohang University of Science and Technology) ;
  • Bang, Ji-Won (Department of Chemistry and Center for Integrated Molecular Systems, Pohang University of Science and Technology) ;
  • Kim, Sung-Jee (Department of Chemistry and Center for Integrated Molecular Systems, Pohang University of Science and Technology) ;
  • Park, Su-Moon (Department of Chemistry and Center for Integrated Molecular Systems, Pohang University of Science and Technology)
  • Published : 2007.06.20
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Abstract

Anchoring quantum dots (QDs) onto thermodynamically stable, large band gap oxide semiconductors is a very important strategy to enhance their quantum yields for solar energy conversion in both visible and near-IR regions. We describe a general procedure for anchoring a few chalcogenide QDs onto the titanium oxide layer. To anchor the colloidal QDs onto a mesoporous TiO2 layer, linker molecules containing both carboxylate and thiol functional groups were initially attached to TiO2 layers and subsequently used to capture dispersed QDs with the thiol group. Employing the procedure, we exploited cadmium selenide (CdSe) and cadmium telluride (CdTe) quantum dots (QDs) as inorganic sensitizers for a large band gap TiO2 layer of dye-sensitized solar cells (DSSCs). Their attachment was confirmed by naked eyes, absorption spectra, and photovoltaic effects. A few QD-TiO2 systems thus obtained have been characterized for photoelectrochemical solar energy conversion.

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References

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