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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.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	A time-resolved fluorescence study of silicon nanoparticles: Testing the dimer stretching model./
作者:	Smith, Adam Douglas.
面頁冊數:	106 p.
附註:	Adviser: Taekjip Ha.
Contained By:	Dissertation Abstracts International69-05B.
標題:	Physics, Condensed Matter. -
電子資源:	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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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
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690 $a 0611
710 2 $a University of Illinois at Urbana-Champaign. $3 626646
773 0 $t Dissertation Abstracts International $g 69-05B.
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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