Nitrogen Doped p-Type ZnSe Layer Grown by Metalorganic Vapor Phase Epitaxy

Abstract
Nitrogen-doped ZnSe layers have been grown on (100) GaAs substrates by metalorganic vapor phase epitaxy using NH3 as the doping material. The N-doped layers exhibit a strong free-to-acceptor transition emission at 77 K and a strong acceptor bound-exciton emission line at 15 K. The layers with a high doping level, which exhibit broader excitonic emission lines, indicate p-type conduction with low resistivities from 102 to 103 Ω·cm, carrier concentrations of the order of 1014 cm-3 and mobilities from 20 to 50 cm2/Vs. Current-voltage characteristics of the N-doped ZnSe/n-GaAs heterojunctions conform to the p-type conduction.