Patent ID: 7649225

Claim:
An asymmetric heterodoped metal oxide (AH 2 MOS) semiconductor device comprising: a substrate; an insulated gate on the top of the substrate and disposed between a source region and a drain region; on one side of the gate, heterodoped tub and source regions wherein the tub region has dopants of a second polarity and a source region is disposed inside the tub region and has dopants of a first polarity opposite to the second polarity; a source tap region comprising a heavily doped region of dopants of the second polarity that extends under a high percentage of the source region; on the other side of the gate, heterodoped buffer and drift regions wherein the buffer regions comprise dopants of the second polarity and the drift region is disposed inside the buffer region and comprises dopants of the first polarity; a drain tap region disposed in the drift region and comprising a heavily doped region of dopants of the first polarity; and a silicide layer in contact with a sidewall of the source region.