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Spatial distribution of interface traps in DeMOS transistors

The spatial distribution of interface traps in a p-type drain extended MOS transistor is experimentally determined by the analysis of variable base-level charge pumping spectra. The evolution of the interface trap distribution can be monitored as a function of the hot-carrier stress time. A double peaked interface trap density distribution, located in the spacer oxide, is extracted. The interface trap density in the poly overlapped drift region is constant as a function of stress time. No channel degradation is observed.