Optical transitions in the isoelectronically doped semiconductor GaP : N: An evolution from isolated centers, pairs, and clusters to an impurity band

In heavily nitrogen doped GaP, we show how isoelectronic doping results in an impurity band, and how this is manifested as a large band-gap reduction and an enhanced band-edge absorption. Heavily doped GaP:N or GaP1-xNx exhib its properties characteristic of both direct and indirect gap semiconductor s. Exciton bound states associated with perturbed nitrogen pair centers and larger GaN clusters are observed. This paper indicates that to properly de scribe the properties of an impurity band, a hierarchy of impurity complexe s needs to be considered. Our data also suggest that the excitonic effect p lays a role in the impurity band formation and band-gap reduction.