A Time-Resolved Fluorescence Study of Silicon Nanoparticles: Testing the Dimer Stretching Model
Smith, Adam Douglas
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https://hdl.handle.net/2142/80572
Description
Title
A Time-Resolved Fluorescence Study of Silicon Nanoparticles: Testing the Dimer Stretching Model
Author(s)
Smith, Adam Douglas
Issue Date
2008
Doctoral Committee Chair(s)
Ha, Taekjip
Department of Study
Physics
Discipline
Physics
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Physics, Condensed Matter
Language
eng
Abstract
The role of surface dimers in the fluorescence mechanism is explored using the theoretical framework of Allan, Delerue, and Lanoo [1]. Their single dimer computations are extended to a fully reconstructed structure using time dependent density functional theory. Despite the inclusion of a fully reconstructed structure and improved computational techniques, their simple stretching model produces an energy barrier inconsistent with the observed temperature-lifetime trends. The discrepancy is attributed to the neglect of more complicated dimer motions, e.g. hydrogen bond wagging.
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