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A time-resolved fluorescence study o...

Smith, Adam Douglas.

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A time-resolved fluorescence study of silicon nanoparticles: Testing the dimer stretching model.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	A time-resolved fluorescence study of silicon nanoparticles: Testing the dimer stretching model./
Author:	Smith, Adam Douglas.
Description:	106 p.
Notes:	Adviser: Taekjip Ha.
Contained By:	Dissertation Abstracts International69-05B.
Subject:	Physics, Condensed Matter. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3314897
ISBN:	9780549649458

A time-resolved fluorescence study of silicon nanoparticles: Testing the dimer stretching model.
Smith, Adam Douglas.

A time-resolved fluorescence study of silicon nanoparticles: Testing the dimer stretching model. - 106 p.

Adviser: Taekjip Ha.

Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2008.

Theoretical models describing the fluorescence of silicon nanoparticles produce widely ranging absorption gaps and radiative lifetimes. To determine which calculations accurately describe the nanoparticle excited state dynamics, the fluorescence lifetimes of spherical 1.0 nm diameter silicon nanoparticles are measured over their entire range of emission energies (3.0--2.1 eV). The measured radiative lifetimes are essentially independent of emission energy. The average lifetime of 2.9 +/- 0.2 ns did not vary with temperature in the range 110--300 K. A hydrogenated structure consisting of six reconstructed silicon surface bonds showed the best agreement with these data. The presence of oxygen is considered and ruled out from comparison to absorption gap data from previous work [25].

ISBN: 9780549649458Subjects--Topical Terms:

1018743
Physics, Condensed Matter.

A time-resolved fluorescence study of silicon nanoparticles: Testing the dimer stretching model.
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008 110518s2008 ||||||||||||||||| ||eng d
020 $a 9780549649458
035 $a (UMI)AAI3314897
035 $a AAI3314897
040 $a UMI $c UMI
100 1 $a Smith, Adam Douglas. $3 1265036
245 1 2 $a A time-resolved fluorescence study of silicon nanoparticles: Testing the dimer stretching model.
300 $a 106 p.
500 $a Adviser: Taekjip Ha.
500 $a Source: Dissertation Abstracts International, Volume: 69-05, Section: B, page: 3065.
502 $a Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2008.
520 $a Theoretical models describing the fluorescence of silicon nanoparticles produce widely ranging absorption gaps and radiative lifetimes. To determine which calculations accurately describe the nanoparticle excited state dynamics, the fluorescence lifetimes of spherical 1.0 nm diameter silicon nanoparticles are measured over their entire range of emission energies (3.0--2.1 eV). The measured radiative lifetimes are essentially independent of emission energy. The average lifetime of 2.9 +/- 0.2 ns did not vary with temperature in the range 110--300 K. A hydrogenated structure consisting of six reconstructed silicon surface bonds showed the best agreement with these data. The presence of oxygen is considered and ruled out from comparison to absorption gap data from previous work [25].
520 $a 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.
590 $a School code: 0090.
650 4 $a Physics, Condensed Matter. $3 1018743
650 4 $a Physics, Molecular. $3 1018648
690 $a 0609
690 $a 0611
710 2 $a University of Illinois at Urbana-Champaign. $3 626646
773 0 $t Dissertation Abstracts International $g 69-05B.
790 $a 0090
790 1 0 $a Ha, Taekjip, $e advisor
791 $a Ph.D.
792 $a 2008
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3314897