UNIFORMITY OF CD1-XZNXTE GROWN BY HIGH-PRESSURE BRIDGMAN

We have employed both low-temperature photoluminescence (PL) spectrosc opy and high-spatial-resolution, room-temperature PL mapping to determ ine composition variation in Cd1-xZnxTe grown by high-pressure Bridgma n. Composition variations Delta x of approximately 5-10% are observed between tip and heel of an approximately 13 cm long boule, while fluct uations of 1-2% are observed within a single, detector-scale sample. W e also show that there are great discrepancies in the calculated zinc concentration, depending on which expression for E(g)(x) is chosen fro m the literature. We have performed high-resolution, triaxial X-ray an alysis on selected samples to determine which of the published relatio ns is most accurate for our material. We have also examined the relati onship between the low-temperature PL spectrum and detector performanc e, and found that the line width of the donor-bound-exciton peak can b e used as a predictor of performance.