Intelligent Growth of HgCdTe by the Traveling Heater Method.

摘要

Large single crystals of (Hg, Cd)Te with desired materials characteristics including radial uniformity of composition and minimal concentrations of defects have been grown from excess tellurium solutions in high purity quartz ampoules by the Traveling Heater Method. Successful transfer of this technology from the laboratory to production requires the implementation of better process controls primarily for improved axial uniformity of composition. Model based predictive control of the crystal growth process is anticipated with the necessary sensors have been applied to this multivariable problem. Eddy Current analysis of the solvent volume and interface shapes, capacitance manometry of mercury partial pressures, precision fiber optic thermometry of thermal gradients and nuclear gauges of composition will be discussed. A computational fluid dynamic and thermodynamic model of mass and thermal transport is proposed.