Donor bound exciton luminescence and absorption in germanium

Abstract
High-resolution absorption and luminescence spectra associated with the creation and decay of excitons bound to neutral donors in germanium are analysed in terms of the Kirczenow shell model (1977). Interparticle interactions in the excited state of the bound exciton, previously observed in phosphorus-doped germanium, are shown to exist in arsenic- and bismuth-doped material. In the luminescence spectra, transitions due to electron-hole recombination within bound m=2 multiexciton complexes are identified.