Electrodeless measurement method of conduction type based on the free carrier absorption effect in CdZnTe

Abstract In this paper, we review theoretical and experimental studies on the infrared attenuation spectrum between 400 and 4000 cm −1 , which is principally due to the free carrier absorption (FCA). The free carrier absorption is possible by means of inter-conduction band transitions which occur in n-CdZnTe, or by means of inter-valence band transitions which occur in p-CdZnTe. Based on the power law fit results of absorption spectra determined by FCA characteristics, we present an optical measurement technique, which can help us to determine the conduction type of CdZnTe in another way.