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Structural Investigations of Colloidal Semiconductor Nanocrystal Heterostructures: Faceting and Epitaxy

  • A. V. Kadavanich (a1), A. Mews (a1), S. H. Tolbert (a1), X. Peng (a1), M. C. Schlamp (a1), J. C. Lee (a1) and A. P. Alivisatos (a1)...

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.

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Corresponding author

* currently: University of California, Department of Chemistry, Los Angeles, CA 90065

References

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1 Bowen Katari, Janet E., Colvin, V.L., and Paul Alivisatos, A., “X-ray Photoelectron Spectroscopy of CdSe Nanocrystals with Applications to Studies of the Nanocrystal Surface,” Journal of Physical Chemistry 98 (15), 4109–17 (1994).
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