Excited states of donor bound excitons and bound multiexciton complexes in silicon

The high resolution photoluminescence spectra reported here show new lines giving the first evidence of excited states of excitons bound to P donors in Si. These excited states are of crucial importance for a recently proposed theory of the bound multiexciton complexes which is based on a shell model. In addition several other new lines associated with the decay of the bound multiexciton complexes, which were predicted by the shell model theory, have been observed and their behaviour is found to be in argeement with the theory.