Quantum confinement regime in silicon nanocrystals

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• 作者：Julien Derr ; Kerry Dunn ; Daria Riabinina ; Franç ; ois Martin ; Mohamed Chaker ; Federico Rosei
• 关键词：Silicon quantum dots ; Optical properties ; Quantum confinement ; Time-resolved photoluminescence
• 刊名：Physica E
• 出版年：2009
• 出版时间：February 2009
• 年：2009
• 卷：41
• 期：4
• 页码：668-670
• 全文大小：193 K

文摘

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 originates from quantum confinement.