Numerical study for diffusion processes in dissolution and growth of heterostructures formed by LPE. Part I. Isothermal conditions

Isothermal growth kinetics of CdxHg1-xTe LPE layers

“…The most complete kinetic description of the interaction between the liquid and solid phases during the formation of a heterostructure was carried out in work [3] with the use of the assumptions about diffusion mass transfer in the ternary systems of A 3 B 5 semiconductors. The offered software of solving the problem concerning the interaction kinetics of phases at LPE in the Cd-Hg-Te system was used in works [4,5]. In those works, the modeling of the diffusion process in the interacting solid and liquid phases was carried out, and the influence of the mass transfer rate on the phase compositions and the interface motion was analyzed.…”

“…The assumption about the existence of a phase equlibrium on the interface underlies the diffusionlimited model. In works [4,5], the equilibrium component concentrations on the moving interface were estimated, by using interpolation expressions for the description of phase equilibria in the Cd-Hg-Te system. Such dependences were obtained in [5,6], by processing the experimental results on LPE in the system under consideration.…”

“…In works [4,5], the equilibrium component concentrations on the moving interface were estimated, by using interpolation expressions for the description of phase equilibria in the Cd-Hg-Te system. Such dependences were obtained in [5,6], by processing the experimental results on LPE in the system under consideration. It is known that the use of such an approach for the plotting of system's phase diagram without regard for the nonequilibrium of the crystallization can cause essential incorrectnesses in the calculated data and the loss of the thermodynamic information about system's behavior.…”

“…It is known that the use of such an approach for the plotting of system's phase diagram without regard for the nonequilibrium of the crystallization can cause essential incorrectnesses in the calculated data and the loss of the thermodynamic information about system's behavior. The mentioned circumstances reduce the significance of the kinetic analysis of LPE carried out in works [5,6] and require the further researches. Therefore, the purpose of the present work is as follows: to analyze the influence of the general parameters of the growth of layers on the composition and growth rate of solid solutions in the Cd-Hg-Te system on the basis of the diffusion-limited model, where the equations of phase equilibria for the polyassociative liquid phase are used as boundary conditions.…”