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Synthesis of Thin Films of Size Selected Silicon Nanocrystallites Using Pulsed Laser Ablation Supersonic

Published online by Cambridge University Press:  15 February 2011

E. Werwa  and
K.D. Kolenbrander
E. Werwa
Affiliation:
Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, werwa@mit.edu, kdk@mit.edu
K.D. Kolenbrander
Affiliation:
Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, werwa@mit.edu, kdk@mit.edu
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Abstract

Thin films composed of size selected silicon nanocrystallites have been fabricated and their photoluminescence behavior has been studied. The silicon nanocrystallites were produced using a pulsed laser ablation supersonic expansion source. This source typically generates silicon clusters of many different sizes, which leads to photoluminescence spectra with a large fiill width at half maximum. To best utilize our gas phase synthesis technique, we have performed size selection of the silicon clusters using a mechanical velocity selection apparatus. Films of these size selected nanocrystallites exhibited photoluminescence spectra which had a smaller full width at half maximum and which were peaked to the blue of the spectra of samples with a broader size distribution. These results suggest that the photoluminescence wavelength of these nanocrystallite thin films is determined by quantum confinement of the electrons and holes in the crystallites.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 397: Symposium B – Advanced laser Processing of Materials-Fundamentals and Applications , 1995 , 381
Copyright
Copyright © Materials Research Society 1996

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