Abstract
Thermal annealing for extended periods (20-1000 hours) at moderately low temperatures (500–675°C) is shown to produce significant hardening to the γ-radiation induced EV + 0.23 eV and EV + 0.38 eV levels in Ge crystals grown by the Czochralski technique from silica crucibles. Annealed samples showed concentrations of these levels between 33–58% of those in untreated control samples, as measured by deep level transient spectroscopy. In some samples, heating to 500°C for 1 hour produced the same effect.

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