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Photoluminescence Study of Li-implantation into ZnSe Epitaxial Layers Grown by Molecular Beam Epitaxy
Published online by Cambridge University Press: 21 February 2011
Abstract
Lithium ion-implantation was performed on ZnSe layers which were grown on GaAs substrates by MBE. Strong photoluminescence emission due to acceptor-bound excitons was observed from samples implanted with lithium doses of up to 1015cm−2 and annealed under optimized conditions for rapid thermal annealing. Lithium implantation results in low damage to the ZnSe as well as the formation of a shallow acceptor level. Thermal degradation of both implanted and unimplanted epilayers caused by the rapid thermal annealing was inviestigated at various annealing temperatures. We find that, under certain annealing conditions, unimplanted samples show greater thermal degradation than lithium implanted samples. The photoluminescence spectrum of an unimplanted sample annealed at 800°C shows considerable degradation; however, a lithium-implanted sample annealed at the same temperature still shows strong luminescence in the excitonic region.
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- Copyright © Materials Research Society 1992