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Science 5 June 1992:
Vol. 256. no. 5062, pp. 1425 - 1427
DOI: 10.1126/science.256.5062.1425
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Articles

Melting in Semiconductor Nanocrystals

A. N. Goldstein 1, C. M. Echer 2, and A. P. Alivisatos 1

1 Department of Chemistry, University of California, Berkeley, and Materials Sciences Division, Lawrence Berkeley Laboratory, Berkeley, CA 94720
2 National Center for Electron Microscopy, Lawrence Berkeley Laboratory, Berkeley, CA 94720

New physics occurs in semiconductors when one or more dimensions of the crystal are reduced to a size comparable to bulk electron delocalization lengths (tens to hundreds of angstroms). The properties of "quantum dots" or semiconductor nanocrystals are now being studied, as techniques to fabricate the crystallites are developed. Temperature-dependent electron diffraction studies on nanocrystals of CdS show a large depression in the melting temperature with decreasing size, as a larger fraction of the total number of atoms is on the surface. Thermal stability may play a role in determining the uses of semiconductor nanocrystals.

Submitted on January 13, 1992
Accepted on April 8, 1992


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