A Possible Interpretation of the 0.839 eV Line in GaAs:Cr
The often observed luminescence band at 0.839 eV GaAs: Cr is generally interpreted as an internal transition (5E-5T2) of the Cr2+ ion. This interpretation has already been excluded and a new interpretation has been proposed by White. We present here another possible explanation.
The number of levels can be explained by a 5E-5E transition of a 5D state in C3v symmetry. Cr2+ (on a Ga site)coupled to a donor on As site or Cr° (interstitial)coupled to an acceptor on an arsenic site are more probable defects to explain qualitatively the 0.839 eV line and the associated 0.75 eV hump. The interstitial model gives rise to a possible interpretation for the 0.574eV line and its satellite at 0.535 eV that we have resolved.
KeywordsInternal Transition Orbital State Chromium Atom Probable Defect Versus Line
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