Počet záznamů: 1  

Charge transport in TiO.sub.2./sub. films with complex percolation pathways investigated by time-resolved terahertz spectroscopy

  1. 1.
    0393333 - FZÚ 2014 RIV US eng J - Článek v odborném periodiku
    Němec, Hynek - Zajac, Vít - Rychetský, Ivan - Fattakhova-Rohlfing, D. - Mandlmeier, B. - Bein, T. - Mics, Zoltan - Kužel, Petr
    Charge transport in TiO2 films with complex percolation pathways investigated by time-resolved terahertz spectroscopy.
    IEEE Transactions on Terahertz Science and Technology. Roč. 3, č. 3 (2013), s. 302-313. ISSN 2156-342X. E-ISSN 2156-3446
    Grant CEP: GA ČR GAP204/12/0232; GA ČR GA13-12386S
    Grant ostatní: AVČR(CZ) M100101218
    Institucionální podpora: RVO:68378271
    Klíčová slova: terahertz spectroscopy * charge transport * TiO2 nanoparticles
    Kód oboru RIV: BM - Fyzika pevných látek a magnetismus
    Impakt faktor: 4.342, rok: 2013

    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 percolated and 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 effective response. 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.
    Trvalý link: http://hdl.handle.net/11104/0222064

     
     
Počet záznamů: 1  

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