The time evolution of interdiffusion in multiple quantum wells: anew model of impurity-induced compositional intermixing

摘要

A new model for impurity-induced compositional interdiffusionnwhich depends explicitly on the time evolution of the impurity-inducednvacancy spatial profile is explored. The inclusion of a newnphenomenological term depending on the time derivative of the vacancynspatial profile provides a time scale, as well as a depth profile of thenresulting interdiffusion. Calculations are presented as a function ofntime for a variety of vacancy concentrations and contrasted to thencalculations using the model of Kahen, Rajeswaren, and Lee. Our modelngenerates good agreement with a range of experiments includingnSi-focused ion beam implantation experiments in AlGaAs multiple quantumnwells