Characterization of electrical properties of <i>β</i>-Ga₂O₃ epilayer and bulk GaAs using terahertz time-domain ellipsometry

Abstract

Abstract The electrical properties of beta-gallium oxide ( β -Ga 2 O 3 ) and gallium arsenide semiconductors were characterized using the emerging terahertz time-domain ellipsometry (THz-TDE) technique. The dielectric and conductivity properties were obtained from the complex ratio of the measured p- and s-polarized THz pulses reflected from the samples. The carrier concentration and mobility were then deduced using the Drude model, and the results showed good accuracy. This work demonstrates THz-TDE as a promising tool for characterizing semiconductors, especially those with high carrier concentrations and significant absorption in the THz region.