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Optical properties of ZnSe doped with Ag and Au

P. J. Dean

B. J. Fitzpatrick and R. N. Bhargava

  • Royal Signals and Radar Establishment, St. Andrews Road, Malvern, Worcestershire, United Kingdom

  • Philips Laboratories, Briarcliff Manor, New York 10510

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Phys. Rev. B 26, 2016 – Published 15 August, 1982

DOI: https://doi.org/10.1103/PhysRevB.26.2016

Abstract

We present bound-exciton (BE) and donor-acceptor-pair (DAP) spectra of ZnSe grown by liquid-phase epitaxy and doped with the transition metals (TM) Ag and Au. Luminescence, luminescence excitation, and time decay spectra establish the assignments of the spectral features and show that Ag forms a medium deep acceptor, (EA)Ag=431±2 meV, consistent with the activation energy for thermal quenching of the DAP spectra. This thermal technique, together with the less precise spectral measurements available for the more-strongly-phonon-coupled Au acceptor indicate that (EA)Au∼550 meV, appreciably less than the probable value for Cu, ∼650 meV. Peculiarities in the BE properties within this TM sequence are discussed with reference to the influence of their d-state characteristics. Strong BE luminescence with no-phonon energy near 2.747 eV is attributed to a neutral AgZn-AgI associate, possibly a split interstitial. Reasons for its absence in ZnSe: Au are discussed. Isotope effects in this spectrum and that of the Li neutral acceptor BE are contrasted. The latter provides proof that LiZn is the persistent shallow Td site acceptor in ZnSe. Further associate BE luminescence is tentatively identified for ZnSe: Ag and ZnSe: Au.

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Phys. Rev. B 26, 2016– Published 15 August, 1982
  • Received 7 December 1981

© 1982 American Physical Society

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