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Proceedings Paper

Nanocrystal spectroscopy and photophysics: direct gap CdSe and indirect gap silicon
Author(s): Louis E. Brus
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Paper Abstract

Semiconductor nanocrystals containing 102 to 103 atoms show significant electronic quantum size effects at energies near the band gap. In solid state terms, this happens because of the large delocalization lengths (ie, small effective masses) that naturally occur for electrons and holes at band extrema in bulk crystals. This size dependence also has a clear, physically equivalent explanation in the language of molecular orbitals. Close analogies exist with the spectroscopy of large aromatic hydrocarbons. In this short manuscript, I compare two nanocrystal systems that have become prototypes for direct and indirect gap behavior: CdSe and Si. Despite the fact that both materials are tetrahedrally hybridized semiconductors of similar band gaps, the effects of quantum confinement are quite different.

Paper Details

Date Published: 21 July 1994
PDF: 5 pages
Proc. SPIE 2125, Laser Techniques for Surface Science, (21 July 1994); doi: 10.1117/12.180863
Show Author Affiliations
Louis E. Brus, AT&T Bell Labs. (United States)

Published in SPIE Proceedings Vol. 2125:
Laser Techniques for Surface Science
Hai-Lung Dai; Steven J. Sibener, Editor(s)

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