Gyromagnetic ratio of the compensating donor centre in nitrogen-doped ZnSxSe1-x

Ken ichi Ogata, J. John Davies, Daniel Wolverson, Shizuo Fujita, Shigeo Fujita

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

The nature of the so-called deep donor that appears at a depth of about 50 meV when ZnSe is doped with nitrogen remains a matter of controversy. The centre is of considerable importance since it appears to act as a compensating centre which is (at least in part) responsible for the difficulties of obtaining effective acceptor concentrations in excess of 1018 cm-3. Several models have been suggested, the most favoured of which is that of a selenium vacancy associated with a substitutional nitrogen. However, although very recent total energy calculations support such a model, no conclusive evidence for this identification exists. Electrons trapped by the centre have a gyromagnetic ratio of 1.38, in contrast to the value of 1.11 for electrons bound at the normal, shallow (26 meV) donors in this material. In order to obtain a better understanding of the centre, we have used spin-flip Raman scattering experiments to determine how this g-value depends on composition in the nitrogen-doped ternary alloy ZnSxSe1-x, for x in the range 0 to 0.1. Surprisingly, we find that the g-value remains constant, in contrast to that for the shallow donors, which increases by 0.12 over the same composition range. The results present a significant challenge for theoretical calculation, since any microscopic model has to be reconciled with this invariance.

Original languageEnglish
Pages (from-to)209-213
Number of pages5
JournalSemiconductor Science and Technology
Volume15
Issue number2
DOIs
Publication statusPublished - 1 Feb 2000

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering
  • Materials Chemistry

Cite this