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Science 19 November 1993:
Vol. 262. no. 5137, pp. 1242 - 1244
DOI: 10.1126/science.262.5137.1242
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Articles

Quantum Confinement in Size-Selected, Surface-Oxidized Silicon Nanocrystals

William L. Wilson 1, P. F. Szajowski 1, and L. E. Brus 1

1 AT&T Bell Laboratories, Murray Hill, NJ 07974-0636

The dynamics and spectroscopy of silicon nanocrystals that emit at visible wavelengths were analyzed. Size-selective precipitation and size-exclusion chromatography cleanly separate the silicon nanocrystals from larger crystallites and aggregates and provide direct evidence for quantum confinement in luminescence. Measured quantum yields are as high as 50 percent at low temperature, principally as a result of efficient oxide passivation. Despite a 0.9—electron-volt shift of the band gap to higher energy, the nanocrystals behave fundamentally as indirect gap materials with low oscillator strength.

Submitted on June 29, 1993
Accepted on September 23, 1993


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Quantum Dot Bioconjugates for Ultrasensitive Nonisotopic Detection.
W. C. Chan and S. Nie (1998)
Science 281, 2016-2018
   Abstract »    Full Text »


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