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Evaluation of colloidal CdSe quantum dots with metal chalcogenide ligands for optoelectronic applications

Published online by Cambridge University Press:  27 February 2012

Yiqiang Zhang ,
R. Acharya  and
X. A. Cao
Yiqiang Zhang
Affiliation:
Department of Computer Science and Electrical Engineering, West Virginia University, Morgantown, WV 26506, USA
R. Acharya
Affiliation:
Department of Computer Science and Electrical Engineering, West Virginia University, Morgantown, WV 26506, USA
X. A. Cao
Affiliation:
Department of Computer Science and Electrical Engineering, West Virginia University, Morgantown, WV 26506, USA
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Abstract

Exchanging the original organic ligands of colloidal CdSe quantum dots (QDs) with metal chalcogenide SnS4 ligands resulted in absorption peak redshifts and complete photoluminescence quenching in QD solids. The ITO/QDs/Al structure with SnS4-capped QDs showed much higher electrical conductivity and reduced space-charge limited current. These results are indicative of carrier delocalization as well as enhanced inter-QD electronic coupling caused by the inorganic ligands. The SnS4-capped QDs were able to retain strong excitonic absorption. The photocurrent spectral response of the all-inorganic QD film resembled its absorption spectra, and was three orders of magnitude stronger than that of QDs with organic ligands. It was found that mild annealing at ∼ 200 oC transformed the SnS4-capped QD film into to a more conductive assembly, degrading its absorption and photocurrent generation. These findings suggest that colloidal QDs with metal chalcogenide ligands are better suited for solar energy conversion and photodetection than use in light-emitting devices as luminophores.

Keywords

II-VInanostructureoptoelectronic
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1409: Symposium CC – Functional Semiconductor Nanocrystals and Metal-Hybrid Structures , 2012 , mrsf11-1409-cc13-02
Copyright
Copyright © Materials Research Society 2012

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