About: THz photoconductivity in light-emitting surface-oxidized Si nanocrystals: the role of large particles

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
Description	We propose an analytical description of the role of local depolarization fields in the terahertz conductivity of nanostructured samples and demonstrate this approach in a sample composed of silicon nanocrystals fabricated by electrochemical etching of silicon wafer followed by an oxidizing treatment. The post-etching treatment leads to a decrease in the average nanocrystalline Si core size which enhances luminescence in the visible range. We show that the dominating microscopic photoconductive response of photocarriers is essentially Drude-like owing to the presence of a very small amount of large nanocrystals; the macroscopic character of the response is, however, deeply modified by the depolarization fields. Smaller nanocrystals appreciably con- tribute to the terahertz conductivity only at high photoexcitation densities where the screening due to depolarization fields suppresses the response of the large particles. We propose an analytical description of the role of local depolarization fields in the terahertz conductivity of nanostructured samples and demonstrate this approach in a sample composed of silicon nanocrystals fabricated by electrochemical etching of silicon wafer followed by an oxidizing treatment. The post-etching treatment leads to a decrease in the average nanocrystalline Si core size which enhances luminescence in the visible range. We show that the dominating microscopic photoconductive response of photocarriers is essentially Drude-like owing to the presence of a very small amount of large nanocrystals; the macroscopic character of the response is, however, deeply modified by the depolarization fields. Smaller nanocrystals appreciably con- tribute to the terahertz conductivity only at high photoexcitation densities where the screening due to depolarization fields suppresses the response of the large particles. (en)
Title	THz photoconductivity in light-emitting surface-oxidized Si nanocrystals: the role of large particles THz photoconductivity in light-emitting surface-oxidized Si nanocrystals: the role of large particles (en)
skos:prefLabel	THz photoconductivity in light-emitting surface-oxidized Si nanocrystals: the role of large particles THz photoconductivity in light-emitting surface-oxidized Si nanocrystals: the role of large particles (en)
skos:notation	RIV/68378271:_____/14:00439724!RIV15-GA0-68378271
http://linked.open...avai/riv/aktivita	I P
http://linked.open...avai/riv/aktivity	I, P(GA13-12386S), P(GPP204/12/P235)
http://linked.open...iv/cisloPeriodika	Sep
http://linked.open...vai/riv/dodaniDat	2015
http://linked.open...aciTvurceVysledku	Kůsová, Kateřina Pelant, Ivan Zajac, Vít Kužel, Petr Němec, Hynek Kadlec, Christelle
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	Fyzikální ústav AV ČR, v. v. i.
http://linked.open...dnocenehoVysledku	50506
http://linked.open...ai/riv/idVysledku	RIV/68378271:_____/14:00439724
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	ultrafast photoconductivity; Si nanocrystals; charge carrier transport; terahertz spectroscopy (en)
http://linked.open.../riv/klicoveSlovo	Si nanocrystals terahertz spectroscopy ultrafast photoconductivity charge carrier transport
http://linked.open...odStatuVydavatele	DE - Spolková republika Německo
http://linked.open...ontrolniKodProRIV	[BF9DC3AA8836]
http://linked.open...i/riv/nazevZdroje	New Journal of Physics
http://linked.open...in/vavai/riv/obor	BM
http://linked.open...ichTvurcuVysledku	6 (xsd:int)
http://linked.open...cetTvurcuVysledku	6 (xsd:int)
http://linked.open...vavai/riv/projekt	Macroscopic and microscopic luminescence properties of silicon nanoparticles Fotovodivost a dynamika excitací v nanostrukturovaných a neuspořádaných polovodičích na ultrarychlé časové škále
http://linked.open...UplatneniVysledku	2014
http://linked.open...v/svazekPeriodika	16
http://linked.open...iv/tvurceVysledku	Kužel, Petr Němec, Hynek Kůsová, Kateřina Pelant, Ivan Kadlec, Christelle Zajac, Vít
http://linked.open...ain/vavai/riv/wos	000342050600001
issn	1367-2630
number of pages	25 (xsd:int)
http://bibframe.org/vocab/doi	10.1088/1367-2630/16/9/093013

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