Patent ID: 7138689

Claim:
A semiconductor device comprising: a first transistor formed in a semiconductor substrate of a first conductivity type, wherein the first transistor comprises: a first channel creation area located in said semiconductor substrate, a first gate insulation film formed on said semiconductor substrate over the first channel creation area, a first gate electrode formed on said first gate insulation film, a first inner sidewall insulation film formed on both sides of the first gate electrode, a first outer sidewall insulation film formed adjacent the first inner sidewall insulation film, wherein said first outer sidewall insulation film is located directly on the semiconductor substrate, a first lightly doped area that contains an impurity of the second conductivity type at a low concentration and is located adjacent to said first channel creation area in said semiconductor substrate underneath said first inner sidewall insulation film, a first heavily doped area that contains an impurity of the second conductivity type at a higher concentration than said first lightly doped area and is located adjacent to said first lightly doped area in said semiconductor substrate underneath the first outer sidewall insulation film and in the areas bordering said first outer sidewall insulation film; and a second transistor formed in the semiconductor substrate and having a different breakdown voltage than said first transistor, wherein said second transistor comprises: a second channel creation area formed in the semiconductor substrate, a second gate insulation film formed on the semiconductor substrate over the second channel creation area, a second gate electrode formed on the second gate insulation film, a second inner sidewall insulation film that is formed at least on part of the second gate insulation film and on both sides of the second gate electrode, a second outer sidewall insulation film that is formed at least partially on and in direct contact with a top surface of the second gate insulation film and adjacent the second inner sidewall insulation film, a second lightly doped area that contains an impurity of the second conductivity type at a low concentration and is located adjacent to the second channel creation area in the semiconductor substrate underneath the second inner sidewall insulation film and the second outer sidewall insulation film, a second heavily doped area that contains an impurity of the second conductivity type at a higher concentration than the second lightly doped area and is located adjacent to the second lightly doped area in the semiconductor substrate.