Volume 83, Number 4, August 2008
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||07 August 2008|
Enhancement of photoluminescence of Ge/GeO2 core/shell nanoparticles
Department of Physics, Jiangxi Normal University - Nanchang 330022, Jiangxi, PRC
2 School of Materials Science and Engineering, Nanyang Technological University - Singapore 639798
Corresponding author: email@example.com
Accepted: 30 June 2008
Ge/GeO2 core/shell nanoparticles embedded in an Al2O3 gate dielectrics matrix were fabricated. The core/shell nanoparticles consist of a single-crystal Ge core and a tiny Ge/GeO2 nanocrystallites shell. The high percentage of defects located at the shell surfaces and the grain boundaries between the Ge/GeO2nanocrystals or disorderly arranged areas in the GeO2shell induce a significant phonon localization effect, which leads to enhanced radiative recombination and thus it enhances the photoluminescence intensity. We believe that the findings presented here provide physical insight and offer useful guidelines to controllably modify the optical properties of indirect semiconductors through defect engineering.
PACS: 78.40.Fy – Semiconductors / 78.67.Bf – Nanocrystals and nanoparticles / 78.55.-m – Photoluminescence, properties and materials
© EPLA, 2008
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