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

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F14%3A00439724" target="_blank" >RIV/68378271:_____/14:00439724 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1088/1367-2630/16/9/093013" target="_blank" >http://dx.doi.org/10.1088/1367-2630/16/9/093013</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1088/1367-2630/16/9/093013" target="_blank" >10.1088/1367-2630/16/9/093013</a>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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 responseof 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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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 responseof 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.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

BM - Fyzika pevných látek a magnetismus

OECD FORD obor

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Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2014

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

New Journal of Physics

ISSN

1367-2630

e-ISSN

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Svazek periodika

16

Číslo periodika v rámci svazku

Sep

Stát vydavatele periodika

DE - Spolková republika Německo

Počet stran výsledku

25

Strana od-do

"093013-1"-"093013-25"

Kód UT WoS článku

000342050600001

EID výsledku v databázi Scopus

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