About: Polarization of photoluminescence excitation and emission spectra of silicon nanorods within single Si/SiO2 nanowires

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About: Polarization of photoluminescence excitation and emission spectra of silicon nanorods within single Si/SiO2 nanowires Goto Sponge NotDistinct Permalink

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Description	Polarization properties of individual silicon nanowires are studied using an optical micro-spectroscopy setup equipped with a Fresnel rhomb to rotate the polarization of the exciting laser and the analyzer to characterize the polarization of emitted photoluminescence. The Si nanowire samples are prepared by electron-beam lithography, plasma etching and oxidation. The fabricated wires are embedded in SiO2 and oriented parallel to the Si substrate. Due to the fluctuating wire diameter (around 5 nm) the very long wires (several tens of) are effectively divided into an array of quantum rods (prolate ellipsoids) These structures have strong photoluminescence under UV-blue excitation at room temperature. The degree of photoluminescence linear polarization of both excitation and emission is very high, between 0.9-1, and reveals relatively low fluctuations at different spots of the wires. Experimental results are compared with available theoretical models leading to the conclusion that the high polarization degree is mostly due to surface charges (dielectric confinement) with smaller contribution of quantum confinement effects. Polarization properties of individual silicon nanowires are studied using an optical micro-spectroscopy setup equipped with a Fresnel rhomb to rotate the polarization of the exciting laser and the analyzer to characterize the polarization of emitted photoluminescence. The Si nanowire samples are prepared by electron-beam lithography, plasma etching and oxidation. The fabricated wires are embedded in SiO2 and oriented parallel to the Si substrate. Due to the fluctuating wire diameter (around 5 nm) the very long wires (several tens of) are effectively divided into an array of quantum rods (prolate ellipsoids) These structures have strong photoluminescence under UV-blue excitation at room temperature. The degree of photoluminescence linear polarization of both excitation and emission is very high, between 0.9-1, and reveals relatively low fluctuations at different spots of the wires. Experimental results are compared with available theoretical models leading to the conclusion that the high polarization degree is mostly due to surface charges (dielectric confinement) with smaller contribution of quantum confinement effects. (en)
Title	Polarization of photoluminescence excitation and emission spectra of silicon nanorods within single Si/SiO2 nanowires Polarization of photoluminescence excitation and emission spectra of silicon nanorods within single Si/SiO2 nanowires (en)
skos:prefLabel	Polarization of photoluminescence excitation and emission spectra of silicon nanorods within single Si/SiO2 nanowires Polarization of photoluminescence excitation and emission spectra of silicon nanorods within single Si/SiO2 nanowires (en)
skos:notation	RIV/00216208:11320/11:10109528!RIV12-AV0-11320___
http://linked.open...avai/predkladatel	Matematicko-fyzikální fakulta
http://linked.open...avai/riv/aktivita	P Z
http://linked.open...avai/riv/aktivity	P(KAN400100701), P(LC510), Z(MSM0021620835)
http://linked.open...iv/cisloPeriodika	3
http://linked.open...vai/riv/dodaniDat	2012
http://linked.open...aciTvurceVysledku	Valenta, Jan
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Univerzita Karlova v Praze / Matematicko-fyzikální fakulta
http://linked.open...dnocenehoVysledku	221061
http://linked.open...ai/riv/idVysledku	RIV/00216208:11320/11:10109528
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	polarization; luminescence; nanorod; nanowire; silicon (en)
http://linked.open.../riv/klicoveSlovo	nanorod nanowire luminescence silicon polarization
http://linked.open...odStatuVydavatele	DE - Spolková republika Německo
http://linked.open...ontrolniKodProRIV	[6889F9B000DB]
http://linked.open...i/riv/nazevZdroje	Physica Status Solidi C - Current Topics in Solid State Physics
http://linked.open...in/vavai/riv/obor	BH
http://linked.open...ichTvurcuVysledku	1 (xsd:int)
http://linked.open...cetTvurcuVysledku	3 (xsd:int)
http://linked.open...vavai/riv/projekt	Center of nanotechnology and materials for nanoelectronics Functional hybrid nanosystems of semiconductors and metals with organic materials (FUNS)
http://linked.open...UplatneniVysledku	2011
http://linked.open...v/svazekPeriodika	8
http://linked.open...iv/tvurceVysledku	Linnros, Jan Valenta, Jan Bruhn, B.
http://linked.open...n/vavai/riv/zamer	Fyzika molekulárních, makromolekulárních a biologických systémů
issn	1610-1642
number of pages	4 (xsd:int)
http://bibframe.org/vocab/doi	10.1002/pssc.201000398
http://localhost/t...ganizacniJednotka	11320
is http://linked.open...avai/riv/vysledek of	Polarization of photoluminescence excitation and emission spectra of silicon nanorods within single Si/SiO2 nanowires Polarization of photoluminescence excitation and emission spectra of silicon nanorods within single Si/SiO2 nanowires

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