An analysis of the effects of ultrasonics on diffusion and the diffusion of copper acceptors in germanium

Abstract

An attempt is made to determine the mechanism of diffusion enhancement with ultrasonics. Three hypothetical explanations of this phenomenon are offered. First, a cyclical change in lattice geometry of the base material could increase the probability of reducing the activation energy for diffusion. Secondly, it is possible for localized temperature increases at points of structural imperfections and high strain to increase the diffusion coefficient from an increase in the atomic kinetic energy. Finally an excess of vacancies could be generated by the movement of dislocations as a result of the high strain rate associated with ultrasonics