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Anchoring cadmium chalcogenide quantum dots (QDs) onto stable oxide semiconductors for QD sensitized solar cells

Title
Anchoring cadmium chalcogenide quantum dots (QDs) onto stable oxide semiconductors for QD sensitized solar cells
Authors
Lee, HJKim, DYYoo, JSBang, JKim, SPark, SM김성지
Date Issued
Jan-2007
Publisher
KOREAN CHEMICAL SOC
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.
Keywords
quantum dot; dye-sensitized solar cell; quantum dot sensitization; SELF-ASSEMBLED LAYERS; NANOCRYSTALLINE TIO2; ELECTRON-TRANSFER; PHOTOVOLTAIC PROPERTIES; CDS; NANOPARTICLES; PBS; PHOTOSENSITIZATION; FILMS
URI
http://oasis.postech.ac.kr/handle/2014.oak/29471
ISSN
0253-2964
Article Type
ARTICLE
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