The effects of Te precipitation on IR transmittance and crystalline quality of as-grown CdZnTe crystals

The relationship of the Te precipitated phase concentration in the matrix t o IR transmittance and crystalline quality of as-grown CdZnTe wafers was in vestigated by means of various optical and structural techniques including infrared (IR) transmission, differential scanning calorimetry (DSC) and Rut herford backscattering spectroscopy (RBS). Results indicate that Te precipi tates/inclusions in CdZnTe matrix reduce IR transmittance, especially at co ncentration greater than or equal to 0.6 wt.%. Additionally, the crystallin e perfection of near-stoichiometric as-grown CdZnTe is better than that of non-stoichiometric samples, and decreases with increasing second-phase conc entration. (C) 1999 Published by Elsevier Science B.V. All rights reserved.