Journal article
Ultrafast Terahertz Conductivity of Photoexcited Nanocrystalline Silicon
The ultrafast transient ac conductivity of nanocrystalline silicon films is investigated using time-resolved terahertz spectroscopy. While epitaxial silicon on sapphire exhibits a free carrier Drude response, silicon nanocrystals embedded in glass show a response that is best described by a classical Drude–Smith model, suitable for disorder-driven metal–insulator transitions.
In this work, we explore the time evolution of the frequency dependent complex conductivity after optical injection of carriers on a picosecond time scale. Furthermore, we show the lifetime of photoconductivity in the silicon nanocrystal films is dominated by trapping at the Si/SiO2 interface states, occurring on a 1–100 ps time scale depending on particle size and hydrogen passivation
Language: | English |
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Publisher: | Springer US |
Year: | 2007 |
Pages: | 447-452 |
ISSN: | 1573482x , 09574522 , 15734803 and 00222461 |
Types: | Journal article |
DOI: | 10.1007/s10854-007-9248-y |