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Structural Investigations of Colloidal Semiconductor Nanocrystal Heterostructures: Faceting and Epitaxy

Published online by Cambridge University Press:  15 February 2011

A. V. Kadavanich ,
A. Mews ,
S. H. Tolbert ,
X. Peng ,
M. C. Schlamp ,
J. C. Lee  and
A. P. Alivisatos
A. V. Kadavanich
Affiliation:
University of California, Department of Chemistry, Box 101, Latimer Hall, Berkeley, CA94720–1460
A. Mews
Affiliation:
University of California, Department of Chemistry, Box 101, Latimer Hall, Berkeley, CA94720–1460
S. H. Tolbert*
Affiliation:
University of California, Department of Chemistry, Box 101, Latimer Hall, Berkeley, CA94720–1460
X. Peng
Affiliation:
University of California, Department of Chemistry, Box 101, Latimer Hall, Berkeley, CA94720–1460
M. C. Schlamp
Affiliation:
University of California, Department of Chemistry, Box 101, Latimer Hall, Berkeley, CA94720–1460
J. C. Lee
Affiliation:
University of California, Department of Chemistry, Box 101, Latimer Hall, Berkeley, CA94720–1460
A. P. Alivisatos
Affiliation:
University of California, Department of Chemistry, Box 101, Latimer Hall, Berkeley, CA94720–1460
*
* currently: University of California, Department of Chemistry, Los Angeles, CA 90065
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Abstract

We use High Resolution Transmission Microscopy (HRTEM) to study CdSe, CdS/HgS/CdS quantum-dot quantum well (QDQW), and CdSe/CdS core-shell nanocrystals, grown by wet-chemical techniques. The nanocrystals have faceted Wulff polyhedron shapes.

In addition to HRTEM, we employ multi-wavelength anomalous dispersion (MAD) x-ray diffraction. We use computer modeling to help interpret the experimental data.

Growth of a heterogeneous phase proceeds epitaxially preserving the overall shape and point-group symmetry of the original seed nanocrystals, both for wurtzite (CdSe/CdS) and zincblende (CdS/HgS/CdS) type structures.

Recently prepared InAs nanocrystals also show evidence of faceting as observed by HRTEM and may lend themselves equally well to epitaxy.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 452 , 1996 , 353
Copyright
Copyright © Materials Research Society 1997

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References

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