Patent ID: 9287261
Filing Date: 2016-03-15
CPC Classification: H01L

Claim Text:
1. A semiconductor device comprising: a semiconductor substrate of one conductivity type; an element isolation region in one principal face of the semiconductor substrate, and an element region surrounded by the element isolation region; a gate dielectric film on the one principal face of the semiconductor substrate; a gate electrode that is formed on the gate dielectric film so as to extend from the element region to the element isolation region at both sides of the element region in a gate width direction, each end portion in the gate width direction of the gate electrode being located on the element isolation region via the gate dielectric film and including a portion located at a first distance from a boundary between the element isolation region in proximity to the end portion and the element region, and a plurality of protruding portions located at a second distance from the boundary that is longer than the first distance, and the plurality of protruding portions sandwiching the portion located at the first distance; first and second impurity regions of the one conductivity type respectively provided in the one principal face in two end regions of the element region in the gate width direction, the two end regions contacting the element isolation region, the first and second impurity regions of the one conductivity type being respectively separated from both ends of the gate electrode in the gate length direction; and first and second impurity regions of an opposite conductivity type respectively formed in the element region at both sides of the gate electrode in the gate length direction.