Regensburg 2010 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 61: Poster II: Materials, Interfaces and Heterostructures

HL 61.20: Poster

Donnerstag, 25. März 2010, 18:00–20:00, Poster D1

Effect of codoping donor atoms in germanium — •Hartmut Bracht¹, Alexander Chroneos², and Robin W. Grimes² — ¹Institut für Materialphysik, WWU, Münster, Germany — ²Department of Materials, Imperial College, London, UK

It has been established that donor atoms migrate predominantly via their interaction with lattice vacancies in germanium. Under high doping conditions donor atoms can form large immobile clusters that contain vacancies. The control of the concentration of free vacancies is essential to control the diffusion of the donor atoms and the formation of larger clusters, which lead to the deactivation of a significant proportion of the donor atoms. In the present study electronic structure calculations in conjunction with mass action analysis are used to predict the concentrations of free vacancies and deactivated donor atoms in germanium codoped with different proportions of carbon, or fluorine, or another donor species. The effect of the different codoping species and the relative concentrations of these on the donor diffusion and deactivation is discussed over a wide temperature range.