Nitrogen-Doped ZnSe and ZnSSe Grown by Molecular Beam Epitaxy

Abstract
Nitrogen-doped ZnSe and lattice-matched ZnSSe were grown on GaAs substrates by MBE using NH3 gas as a dopant source. The epilayers were characterized by photoluminescence. ZnSe was rather easily doped, and samples in which the acceptor-bound exciton line was a major line in the exciton emission region at 11 K were obtained. ZnSSe was less readily doped with nitrogen at the same NH3 effective pressure. However, the free-to-acceptor omission at 60 K was stronger in ZnSSe than in ZnSe, due to the effect of lattice matching.