Patent ID: 7161210
Filing Date: 2007-01-09
Classification: H01L

Abstract:
1. A semiconductor device comprising: a gate electrode formed on a first conductive type semiconductor substrate via a first gate oxide film and a second gate oxide film; second conductive type source•drain regions of low and high concentration formed adjacent to the gate electrode, and a first conductive type region of low concentration and a first conductive type region of high concentration formed adjacent to the source region of low concentration and the source region of high concentration; wherein a diffusion region width of the source-drain regions of low concentration on the source region side is smaller than at least that on the drain region side; wherein the source region of high concentration is located in the source region of low concentration and the drain region of high concentration is located in the drain region of low concentration; wherein the first conductive type region of low concentration does not extend under the second gate oxide film; and wherein the second gate oxide film is closer than the first gate oxide film to the source region of low concentration.