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Time-resolved terahertz spectroscopy is employed to study silicon nanocrystals prepared by thermal decomposition of silicon-rich SiOx layers. We observe that higher silicon content favors formation of larger silicon clusters with short-range percolation.
Measurement and Monte-Carlo simulations of THz photoconductivity spectra of CdS nanocrystalline films revealed a strong coupling between adjacent nanocrystals. Investigation of ultrafast dynamics provides information about initial sub-picosecond carrier cooling and subsequent carrier recombination.
Terahertz time-resolved conductivity measurements supported by classical simulations of photocarrier motion provide length scales of the charge localization within nanocrystals and their clusters and characterize the conductive coupling between them on the ultrafast time scale.
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