Journal
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
Volume 41, Issue 4, Pages 668-670Publisher
ELSEVIER
DOI: 10.1016/j.physe.2008.11.008
Keywords
Silicon quantum dots; Optical properties; Quantum confinement; Time-resolved photoluminescence
Funding
- FQRNT
- NSERC
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We study the origin of photoluminescence (PL) in Si nanocrystals embedded in a silicon-rich SiO2 matrix. PL properties as a function of time and temperature were investigated for nanocrystal diameters (d) ranging from about 1.5 to 4 nm. All our observations (logarithmic evolution of the timescale as a function of energy, gap associated temperature shift of the PL energy, and logarithmic evolution of size as a function of confinement energy) indicates that PL occurring in small nanocrystals (d<4 nm) originates from quantum confinement. (c) 2008 Elsevier B.V. All rights reserved.
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