Patent ID: 6933561
Filing Date: 2005-08-23
Classification: H01L

Abstract:
1. A semiconductor device comprising: a semiconductor substrate; a gate electrode provided on a gate insulating film formed on the surface of the semiconductor substrate; a post-oxide film comprising a first portion, a second portion and a third portion, the first portion extending on a sidewall of the gate electrode to the surface of the semiconductor substrate, the second portion extending on the surface of the semiconductor substrate and contacting with the first portion, the third portion extending on the surface of the semiconductor substrate with its end contacting with an end of the second portion opposite to the first portion and thinner than the second portion; a spacer covering a sidewall of the first portion on the second portion and the third portion; source/drain extension layers formed in the surface of the semiconductor substrate under the second position and/or third portion and sandwiching a channel region under the gate electrode; and source/drain diffusion layers formed in the surface of the semiconductor substrate and contacting with ends of the source/drain extension layers opposite from the channel region.