The luminescence band at 0.95 eV has been identified as originating from the transition within (Si_GaV_GaSi_Ga) complexes by comparing cathodoluminescence and positron annihilation spectra. The upper and lower energy levels of the molecule-like defect complexes are suggested to lie at 22 meV below the conduction band and at about 0.5 eV above the valence band, respectively.
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