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Nanocrystals of II-VI Semiconductor Materials

Published online by Cambridge University Press:  28 February 2011

Horst Weller ,
Tobias Vossmeyer ,
Alexander Eychmüller ,
Alf Mews ,
Lynne Katsikas  and
Gunter Reck
Horst Weller
Affiliation:
Universität Hamburg, Institüt für Physikalische Chemie, Bundesstrasse 45, D-20146 Hamburg, Germany
Tobias Vossmeyer
Affiliation:
Hahn-Meitner-Institut, Abteilung Kleinteilchenforschung, Glienickerstrasse 100, D-14109 Berlin, Germany
Alexander Eychmüller
Affiliation:
Universität Hamburg, Institüt für Physikalische Chemie, Bundesstrasse 45, D-20146 Hamburg, Germany
Alf Mews
Affiliation:
Hahn-Meitner-Institut, Abteilung Kleinteilchenforschung, Glienickerstrasse 100, D-14109 Berlin, Germany
Lynne Katsikas
Affiliation:
Hahn-Meitner-Institut, Abteilung Kleinteilchenforschung, Glienickerstrasse 100, D-14109 Berlin, Germany
Gunter Reck
Affiliation:
Bundesanstalt für Materialpriifung, Berlin
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Abstract

CdS nanoclusters ranging in diameter between 1 and 4 nm were prepared in aqueous solution using aliphatic mercaptoalcohols as ligands. The photon energies of the Is Is absorption and the respective oscillator strengths are in accordance with size quantization theory. Some clusters crystallize as macroscopic 3-D superlattices which were investigated by single crystal x-ray analysis. The neutral Cd17S4(RS)26 clusters are covalently linked in the superlattice the structure of which exhibits self similarity to the interior structure of the clusters.

Onion-shell-like composite particles from CdS and HgS were prepared by successive substitution and re-precipitation processes. Particles with a core radius of 2 nm, a shell of up to 1 nm HgS followed by a final shell of up to 1.5 nm CdS were obtained. Electrons and holes were localized in the HgS shell giving rise to excitonic fluorescence.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 358: Symposium F – Microcrystalline and Nanocrystalline Semiconductors , 1994 , 213
Copyright
Copyright © Materials Research Society 1995

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References

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