Comparative optical studies of chemically synthesized silicon nanocrystals

Gildardo R. Delgado, Howard W H Lee, Susan M. Kauzlarich, Richard A. Bley

Research output: Chapter in Book/Report/Conference proceedingConference contribution

6 Scopus citations


We studied the optical and electronic properties of silicon nanocrystals derived from two distinct fabrication procedures. One technique uses a controlled chemical reaction. In the other case, silicon nanocrystals are produced by ultrasonic fracturing of porous silicon layers. We report on the photoluminescence, photoluminescence excitation, and absorption spectroscopy of various size distributions derived from these techniques. We compare the different optical properties of silicon nanocrystals made this way and contrast them with that observed in porous silicon. Our results emphasize the dominant role of surface states in these systems as manifested by the different surface passivation layers present in these different fabrication techniques. Experimental absorption measurements are compared to theoretical calculations with good agreement. Our results provide compelling evidence for quantum confinement in both types of Si nanocrystals. Our results also indicate that the blue emission from very small Si nanocrystals corresponds to the bandedge emission, while the red emission arises from traps.

Original languageEnglish (US)
Title of host publicationMaterials Research Society Symposium - Proceedings
EditorsR.W. Collins, P.M. Fauchet, I. Shimizu, J.C. Vial, T. Shimada, A.P. Alivisatos
PublisherMaterials Research Society
Number of pages6
StatePublished - 1997
Externally publishedYes
EventProceedings of the 1996 MRS Fall Meeting - Boston, MA, USA
Duration: Dec 2 1996Dec 6 1996


OtherProceedings of the 1996 MRS Fall Meeting
CityBoston, MA, USA

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials


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