Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2011-10-28
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
Scientific paper
First-order perturbation theory and many-body Green function analysis are used to quantify the influence of size, surface reconstruction and surface treatment on exciton transport between small silicon quantum dots. Competing radiative processes are also considered in order to determine how exciton transport efficiency is influenced. The analysis shows that quantum confinement causes small (~1 nm) Si quantum dots to exhibit exciton transport efficiencies far exceeding that of their larger counterparts. We also find that surface reconstruction significantly influences the absorption cross section and leads to a large reduction in both transport rate and efficiency. Exciton transport efficiency is higher for hydrogen passivated dots as compared with those terminated with more electronegative ligands. This is because such ligands delocalize electron wave functions towards the surface and result in a lower dipole moment. Such behavior is not predicted by F\"orster theory, built on a dipole-dipole approximation, because higher order multi-poles play a significant role in the exciton dynamics.
Franceschetti Alberto
Li Huashan
Lin Zhibin
Lusk Mark T.
No associations
LandOfFree
Efficient Exciton Transport in Strongly Quantum-Confined Silicon Quantum Dots does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Efficient Exciton Transport in Strongly Quantum-Confined Silicon Quantum Dots, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Efficient Exciton Transport in Strongly Quantum-Confined Silicon Quantum Dots will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-199810