Formation of Ion Pairs and Triplets between Lithium and Zinc in Germanium

This paper is a study of ion pairs and triplets formed between zinc and lithium dissolved in single crystal germanium. As in earlier work on ion pairs involving simpler acceptors, the effects of ion complexes on Hall mobility, and impurity energy levels have been investigated. Relaxation-time experiments have also been performed. The theoretical analysis of the results is in complete accord with the idea that zinc provides two energy levels for electrons in the forbidden gap.