No 1, Vol. 4, 2001 
 

ON THE PHOTOLUMINESCENCE OF Si NANOPARTICLES

H.S. Chen, J.-J. Chiu and T.-P. Perng

Department of Materials Science and Engineering
National Tsing Hua University
Hsinchu 30043, Taiwan

Abstract

Silicon nanoparticles with diameters ranging from 3 to 50 nm were prepared by thermal evaporation. The nanoparticles showed visible light emissions from 5000 Å to 9000 Å, with peak intensity at 8000-8200 Å, when excited with a He-Cd laser. The intensity increased with decreasing particle size. Based on the photoluminescence (PL) characteristics, it is suggested that the PL for particles larger than 9 nm is surface state-induced, while the PL for those smaller than 9 nm is ascribed to quantum confinement effects.

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