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NBTI degradation and recovery have been investigated for 7 to 50nm oxides and compared to a thin 2.2nm nitrided oxide. A wide regime of stress fields 2.5MV/cm to 8MV/cm has been covered. NBTI effect for the nitrided oxide is larger than for non-nitrided oxides. The percentage of threshold shift DeltaVth which is "lost" during a long measurement delay - which is the quantity leading to curved...
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