An apparently non-quasi-static degradation behavior is found for nMOS transistors that are dynamically stressed with conditions which favor hot-hole injection. This effect can be ascribed to a post-stress effect occurring during the waiting time between the different pulses. It is shown that this effect is of importance only when a net positive charge is built up during the stress. The deviating behavior under dynamic stress conditions can be predicted based on the measurement of the post-stress effect after a static degradation.<
Published in:
Electron Device Letters, IEEE
(Volume:13
,
Issue:
7
)
Date of Publication: July 1992