Electronic structure of oxygen in gallium phosphide

There are, at present, two models concerning the electronic structure of GaP:O. One is based upon the results of one-electron Green's-function calculations; the other employs the defect-molecule concept and stresses the many-electron origin of the states of GaP:O. It is the purpose of this paper to show that the latter model is internally inconsistent and that its implications contradict the concensus of deep-level theory which has been established by recent quantitative studies.