Patent ID: 7132720
Filing Date: 2006-11-07
Classification: H01L

Abstract:
1. A semiconductor device, comprising: a semiconductor substrate; an integrated circuit part formed on said semiconductor substrate; and a guard ring part formed on said semiconductor substrate and surrounding said integrated circuit part to prevent moisture intrusion from the outside, wherein said integrated circuit part includes: a gate insulation film formed on said semiconductor substrate; a gate electrode formed on said gate insulation film; and a pair of impurity diffusion layers formed in a surface of said semiconductor substrate to sandwich said gate electrode in a plan view, and said semiconductor device further comprises: a first interlayer insulation film which covers at least said gate electrode and said pair of impurity diffusion layers, and is formed to extend over said integrated circuit part and said guard ring part, and in which first contact holes reaching at least said pair of impurity diffusion layers are formed; a wiring layer formed on said first interlayer insulation film and connected to at least said pair of impurity diffusion layers via said first contact holes; and a second interlayer insulation film formed on said first interlayer insulation film and covering said wiring layer, in said second interlayer insulation film second contact holes reaching said wiring layer being formed in said integrated circuit part, said first and second interlayer insulation films have a trench reaching said semiconductor substrate only in said guard ring part and deeper than said second contact holes, and said trench and said second contact holes have a buried conductive layer buried therein.