Patent ID: 6373110
Filing Date: 2002-04-16
Classification: H01L

Abstract:
A semiconductor device comprising a field effect transistor fabricated on a substrate, said field effect transistor includinga drain layer formed on said substrate and doped with a first dopant impurity for imparting a first conductivity type thereto, a gate insulating layer formed on a first surface portion of said drain layer, a gate electrode formed on said gate insulating layer and having at least one gate portion elongated in a first direction, a drain contact region doped with said first dopant impurity heavier than said drain layer for imparting said first conductivity type thereto and having at least one drain contact sub-region formed in a second surface portion of said drain layer contiguous to one side of said first surface portion and elongated in said first direction, a channel forming region doped with a second dopant impurity for imparting a second conductivity type opposite to said first conductivity type thereto and formed in a third surface portion of said drain layer contiguous to the other side of said first surface portion and elongated in said first direction, an impurity region formed in said channel forming region and doped with said second dopant impurity heavier than said channel forming region, plural source regions doped with said first dopant impurity, formed in said channel forming region between said impurity region and said first surface portion in a self-aligned manner with said gate electrode and spaced from one another in said first direction, a drain electrode held in contact with said drain contact region, and a source electrode held in contact with said plural source regions and said impurity region, wherein at least one of said drain contact region and said channel forming region has a deformed portion directed to the gap between said plural source regions, and the distance between said drain contact region and said channel forming region is measured in a second direction perpendicular to said first direction so as to be different between said deformed portion and a remaining portion of said at least one of said drain contact region and said channel forming region.