Hot-carrier degradation mechanism in narrow- and wide-channel n-MOSFETs with recessed LOCOS isolation structure

Narrow-channel n-MOSFETs with recessed LOCOS (R-LOCOS) isolation structure exhibit less hot carrier-induced degradation than wide-channel n-MOSFETs, but the degradation mechanism of both devices is the same. This new finding Is explained by the fact that in deep submicron MOSFETs with ultra-thin gate oxide, the dominant factor deciding the degradation behavior in narrow- and wide-channel devices is the vertical electric field effect rather than the mechanical stress effect.