Temperature-dependent terahertz conductivity of tin oxide nanowire films

Temperature-dependent terahertz conductivity of tin oxide (SnO 2 ) nanowire films was measured from 10 to 300 K using terahertz time-domain spectroscopy. The optical parameters, including the complex refractive index, optical conductivity and dielectric function, were obtained using a simple effective medium theory. The complex conductivity was fitted with the Drude–Smith model and the plasmon model. The results show that the carrier density ( N ) and plasmon resonance frequency ( ω 0 ) increase while the scattering time decreases with increasing temperature. The reduced carrier mobility compared with bulk SnO 2 indicates the presence of carrier localization or trapping in these nanowires.