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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)
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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)
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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)
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skos:notation
| - RIV/68378271:_____/14:00439724!RIV15-GA0-68378271
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http://linked.open...avai/riv/aktivita
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http://linked.open...avai/riv/aktivity
| - I, P(GA13-12386S), P(GPP204/12/P235)
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http://linked.open...iv/cisloPeriodika
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http://linked.open...vai/riv/dodaniDat
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http://linked.open...aciTvurceVysledku
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http://linked.open.../riv/druhVysledku
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http://linked.open...iv/duvernostUdaju
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http://linked.open...titaPredkladatele
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http://linked.open...dnocenehoVysledku
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http://linked.open...ai/riv/idVysledku
| - RIV/68378271:_____/14:00439724
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http://linked.open...riv/jazykVysledku
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http://linked.open.../riv/klicovaSlova
| - ultrafast photoconductivity; Si nanocrystals; charge carrier transport; terahertz spectroscopy (en)
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http://linked.open.../riv/klicoveSlovo
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http://linked.open...odStatuVydavatele
| - DE - Spolková republika Německo
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http://linked.open...ontrolniKodProRIV
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http://linked.open...i/riv/nazevZdroje
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http://linked.open...in/vavai/riv/obor
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http://linked.open...ichTvurcuVysledku
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http://linked.open...cetTvurcuVysledku
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http://linked.open...vavai/riv/projekt
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http://linked.open...UplatneniVysledku
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http://linked.open...v/svazekPeriodika
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http://linked.open...iv/tvurceVysledku
| - Kužel, Petr
- Němec, Hynek
- Kůsová, Kateřina
- Pelant, Ivan
- Kadlec, Christelle
- Zajac, Vít
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http://linked.open...ain/vavai/riv/wos
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issn
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number of pages
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http://bibframe.org/vocab/doi
| - 10.1088/1367-2630/16/9/093013
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