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Wave-Function Engineering of CdSe/CdS Core/Shell Quantum Dots for Enhanced Electron Transfer to a TiO2 Substrate.
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2010 (English)In: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455, Vol. 114, no 35, 15184-15189 p.Article in journal (Refereed) Published
Abstract [en]

The authors synthesized core/shell quantum dots (QDs) for the purpose of enhancing the electron transfer from the dots to a TiO2 substrate. The authors make use of the fact that CdSe is a small-bandgap material compared with CdS; therefore, in a common CdSe/CdS core/shell QD, the photoexcited electron is confined deeply in the CdSe core. By special construction of the CdS/CdSe core/shell QDs, referred as reversed type-I, the electron wave function will distribute largely in the shell region. This facilitates the transfer of the electron from the QD to the TiO2 substrate, resulting in significantly improved electron-injection efficiency. Such an enhanced electron-injection efficiency was confirmed by fluorescence lifetime decay measurements, showing the largest lifetime redn. after that the QDs were adsorbed on the TiO2 surface. The reversed type-I CdS/CdSe QDs show a much higher photon-to-current conversion efficiency than type-I CdSe/CdS and CdSe QDs without shell. Also, by chem.-bath depositing of CdS on the QD-sensitized electrode to form a quantum-well structure, the electron recombination between the QDs and the redox couple was reduced, hence further enhancing the electron-injection efficiency. The absorbed-photon-to-current efficiency of the quantum well CdS/CdSe/CdS sensitized solar cells reaches a value ≤60%. [on SciFinder(R)]

Place, publisher, year, edition, pages
2010. Vol. 114, no 35, 15184-15189 p.
Keyword [en]
wave function engineering cadmium selenide sulfide quantum dot, core shell quantum dot electron transfer titania substrate
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:uu:diva-218485DOI: 10.1021/jp102978gOAI: oai:DiVA.org:uu-218485DiVA: diva2:695810
Note

CAPLUS AN 2010:1047054(Journal)

Available from: 2014-02-12 Created: 2014-02-12 Last updated: 2017-12-06

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Tian, Haining

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