Charge transport in TiO2 films with complex percolation pathways investigated by time-resolved terahertz spectroscopy

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F13%3A00393333" target="_blank" >RIV/68378271:_____/13:00393333 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1109/TTHZ.2013.2255555" target="_blank" >http://dx.doi.org/10.1109/TTHZ.2013.2255555</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1109/TTHZ.2013.2255555" target="_blank" >10.1109/TTHZ.2013.2255555</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Charge transport in TiO2 films with complex percolation pathways investigated by time-resolved terahertz spectroscopy

Popis výsledku v původním jazyce

Depolarization fields play an important role in terahertz experiments on nanostructured samples. Namely, their effects hide peculiarities of nanoscopic charge transport in the spectra measured on these structures. We calculate local fields for percolatedand non-percolated model structures by numerical solving of Maxwell equations in the quasi-static limit. The results suggest that in a broad family of structures a simple effective medium approximation model can be applied to characterize the effectiveresponse. The model consists in an equivalent circuit composed of a resistance accounting for the percolated chains with an additional parallel RC-branch describing the non-percolated part. We show a recipe for the retrieval of a response connected to the depolarization fields and to the nanoscale transport mechanisms from transient terahertz spectra. Finally, we use the model to interpret our THz photoconductivity spectra in various TiO films with nanofabricated percolation pathways.

Název v anglickém jazyce

Charge transport in TiO2 films with complex percolation pathways investigated by time-resolved terahertz spectroscopy

Popis výsledku anglicky

Depolarization fields play an important role in terahertz experiments on nanostructured samples. Namely, their effects hide peculiarities of nanoscopic charge transport in the spectra measured on these structures. We calculate local fields for percolatedand non-percolated model structures by numerical solving of Maxwell equations in the quasi-static limit. The results suggest that in a broad family of structures a simple effective medium approximation model can be applied to characterize the effectiveresponse. The model consists in an equivalent circuit composed of a resistance accounting for the percolated chains with an additional parallel RC-branch describing the non-percolated part. We show a recipe for the retrieval of a response connected to the depolarization fields and to the nanoscale transport mechanisms from transient terahertz spectra. Finally, we use the model to interpret our THz photoconductivity spectra in various TiO films with nanofabricated percolation pathways.

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

2013

Kód důvěrnosti údajů

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

Název periodika

IEEE Transactions on Terahertz Science and Technology

ISSN

2156-342X

e-ISSN

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Svazek periodika

3

Číslo periodika v rámci svazku

3

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

12

Strana od-do

302-313

Kód UT WoS článku

000318771300012

EID výsledku v databázi Scopus

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