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Photoconductivity of ZnO Nanowires Decorated with CdSe Quantum Dots

Published online by Cambridge University Press:  11 January 2012

Dongchao Hou ,
Apurba Dev ,
Kristian Frank ,
Andreas Rosenauer  and
Tobias Voss
Dongchao Hou
Affiliation:
Institute of Solid State Physics, University of Bremen, D-28359 Bremen, Germany
Apurba Dev
Affiliation:
Institute of Solid State Physics, University of Bremen, D-28359 Bremen, Germany
Kristian Frank
Affiliation:
Institute of Solid State Physics, University of Bremen, D-28359 Bremen, Germany
Andreas Rosenauer
Affiliation:
Institute of Solid State Physics, University of Bremen, D-28359 Bremen, Germany
Tobias Voss
Affiliation:
Institute of Solid State Physics, University of Bremen, D-28359 Bremen, Germany
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Abstract

A hybrid assembly was built using ZnO nanowire (NW) arrays and colloidal CdSe quantum dots (QDs) stabilized by 3-mercaptopropionic acid (MPA). The QDs were chemically linked to the nanowires through the bonds formed between the outgoing carboxyl groups of the QD stabilizers and the zinc ions on the nanowire surface. An efficient clustering attachment of the QDs was achieved via partial removal of the stabilizers of the QDs. The photoconductivity of the NW/QD assembly was investigated by selective excitation of the CdSe QDs. Oxygen desorption from the nanowire surface enhances the photoconductivity and a model involving electron transfer between the QDs and the nanowires is proposed to explain the experimental results.

Keywords

photoconductivityII-VInanostructure
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1408: Symposium BB – Functional Nanowires and Nanotubes , 2012 , mrsf11-1408-bb10-20
Copyright
Copyright © Materials Research Society 2012

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References

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