HYDROGENATION OF UNDOPED AND NITROGEN-DOPED CDTE GROWN BY MOLECULAR-BEAM EPITAXY

The effect of atomic hydrogen during the growth of undoped and nitroge n-doped CdTe by photon-assisted molecular beam epitaxy was investigate d. Hydrogen incorporation is enhanced by the presence of nitrogen. Inf rared absorption measurements strongly suggest the formation of N-H co mplexes. Hall measurements indicate that the complexes are donorlike i n nature. Hydrogenation radically changes the low temperature photolum inescence in both undoped and nitrogen-doped layers. Exciton-related l uminescence is quenched at low temperature. Nitrogen-related donor-acc eptor pair luminescence is also absent from N-doped hydrogenated layer s, consistent with complex formation. Copper donor-acceptor pair lumin escence appears to be enhanced by hydrogen. (C) 1996 American Institut e of Physics.