Process Modeling and Simulation for Hg_(1-x)Cd_xTe. Part Ⅱ: Self-Diffusion, Interdiffusion, and Fundamental Mechanisms of Point-Defect Interactions in Hg_(1-x)Cd_xTe

摘要

The Hg_(0.8)Cd)_(0.2)Te type-conversion, Hg self-diffusion and interdiffusion processes are analyzed in the context of a first order reaction kinetics approach. Sets of nonlinear, stiffly coupled continuity equations are presented which describe the underlying physics, and their solutions model the observed macroscopic behavior. It is demonstrated that the Frenkel pair mechanism interactions dominated by the cation sublattice, in conjunction with basic diffusive and drift properties of the ionized point defects, comprise the basic processes which effect all macroscopic phenomena discussed. Existing experimental results are reviewed and apparent discrepancies discussed. Use is made of the Stanford University mercury cadmium telluride process simulator to provide quantitative and insightful examples of important results.