Wave-function symmetry and the properties of shallow P donors in 4H SiC

摘要

A new investigation on the optical properties of the phosphorus-bound excitons is presented. Arguments are given in favor of the possibility of degenerate donor state for phosphorus substituting Si atom on hexagonal site. On the base of a simple model, it is shown that the experimental spectra also provide evidence in favor of this possibility. The possibility for violation of the Haynes rule in the case of phosphorus donors on the two inequivalent sites is indicated.