Intrinsic Defects in II-VI Compounds.
Final rept. 15 Mar 72-30 Jun 74,
GENERAL ELECTRIC CORPORATE RESEARCH AND DEVELOPMENT SCHENECTADY N Y
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Electron paramagnetic resonance EPR and optical studies have been used to study zinc vacancies and associated defects both in as-grown material and as produced by 1.5 MeV electron irradiation in cubic ZnSe and ZnS. Extensive studies of room temperature defect production and subsequent anneal vs sample preparation and history were performed in ZnSe. Defects observed and studied include the isolated zinc vacancy and zinc vacancies trapped by substitutional sulfur, tellurium, and chlorine impurities. Defects studied in ZnS include the isolated zinc vacancy and the zinc-vacancy-chlorine donor pair. Irradiation at 20.4 degrees K revealed several spectra in ZnSe, which were identified as zinc vacancy-zinc interstitial close-pairs of different microscopic configuration. Extensive studies using uniaxial stress and unidirectional electron beams which allow detailed microscopic models to be proposed for these defects were performed. This represents the first direct unambiguous observation of close Frenkel pairs in any solid.
- Solid State Physics