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Enhanced Interdiffusion of GaAs-AlgaAs Interfaces Following Ion Implantation and Rapid Thermal Annealing
Published online by Cambridge University Press: 21 February 2011
Abstract
The interdiffusion of GaAs-AlGaAs interfaces has been shown to be enhanced following ion implantation and rapid thermal annealing at approximately 950°C. A model is presented which explains this phenomenon. It is based on the solution of coupled diffusion equations involving the excess vacancy and Al distributions following ion implantation. Both initial distributions are obtained from the solution of a three-dimensional Monte Carlo simulation of ion implantation into a heterostructure sample. The model is found to be in excellent agreement with several sets of experimental data. More specifically, the model is shown to be valid for ions which do not diffuse appreciably in the time frame of the rapid thermal annealing and for as-implanted vacancy concentrations below ∼6×1019 cm−3. Above that concentration, some vacancies are hypothesized to coalesce, thus being unavailable to assist in the enhanced interdiffusion process.
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- Copyright © Materials Research Society 1989