Abstract
Far-infrared (F-IR) reflection spectra were measured for n-type Bi0.88Sb0.12, p-type (Bi0.25Sb0.75)2Te3, n-type Bi2(Se0.2Te0.8)3 and n-type Bi2(Se0.05Te0.95)3, and dispersion parameters, plasma frequency and damping factor were determined. For electrical conductivity, carrier density and mobility calculated from those dispersion parameters, good agreement was obtained with those from electrical measurements.
