Radiative Lifetime and Internal Quantum Efficiency of small Scale Silicon Nanostructures
No Thumbnail Available
Date
2009-06
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Addis Ababa University
Abstract
Nanosilicon (nanocrystal and porous) research is gaining tremendous attention in recent
years due to the light emitting properties of the material. Improving efficiencies in radiative
recombination and light extraction of this material enhances potential applications as
microelectronic and optoelectronic devices with new operational capabilities. In this work
we investigate the influence of quantum confinement and excitation laser pump flux on
the optical parameters of silicon nanocrystal. Our work presents a new approach for the
photoluminescence mechanism of silicon nanocrystal by using phenomenological formulations
that explain the size and laser pump flux dependence of photoluminescence intensity,
radiative lifetime and internal quantum efficiency. To investigate the mechanism of the
photoluminescence we perform computer simulation using fortran programming. These
results show that, miniaturizing the size and increasing laser pump flux strongly alters
photoluminescence intensity, radiative lifetime and internal quantum efficiency of silicon
nanocrystal. Our results have in well agreement with many other theoretical and experimental
findings. Our model confirms photoluminescence emission intensity and internal
quantum efficiency enhance due to quantum confinement and we can tune the emission
spectral range across the visible by using proper sized silicon nanocrystal
Description
Keywords
Radiative Lifetime and Internal Quantum