Physico-mathematical models of heterodiffusion in a layer

We obtain and study the solution of vertical diffusion problems for a dopant applying different model approximations. We establish the area of applicability of models of diffusion with two migration paths, with and without consideration of the mutual transitions of dopant particles, and diffusion in a medium with traps. Translated fromMatematichni Metodi ta Fiziko-mekhanichni Polya, Vol. 39, No. 1, 1996, pp. 60–65.