Non-Arrhenius anomalous hopping electronic transport in hydrogenated amorphous silicon and composite amorphous/nanocrystalline thin films
The temperature dependence of the dark conductivity of hydrogenated amorphous silicon (a-Si:H) thin films and a-Si:H films containing germanium or silicon nanocrystalline inclusions are examined. Analysis using the reduced activation energy provides clear evidence that conduction is non-Arrhenius, a...
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Veröffentlicht in: | Journal of applied physics 2015-12, Vol.118 (21) |
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Hauptverfasser: | , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | The temperature dependence of the dark conductivity of hydrogenated amorphous silicon (a-Si:H) thin films and a-Si:H films containing germanium or silicon nanocrystalline inclusions are examined. Analysis using the reduced activation energy provides clear evidence that conduction is non-Arrhenius, and is more accurately described by an anomalous hopping expression σ(T)=σ1 exp[−(T0/T)κ] where the exponent is κ ∼ 0.75 ± 0.05. This observed temperature dependence is discussed in terms of alternative models for electronic transport in amorphous semiconductors. |
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ISSN: | 0021-8979 1089-7550 |
DOI: | 10.1063/1.4936615 |