Patent ID: 7411257
Filing Date: 2008-08-12
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 contact holes reaching at least said pair of impurity diffusion layers are formed; and a wiring layer formed on said first interlayer insulation film and connected to at least said pair of impurity diffusion layers via said contact holes, said first interlayer insulation film has a plurality of first trenches reaching said semiconductor substrate, said first trenches being formed discontinuously in said guard ring part, each of said plurality of first trenches is formed to be shorter in length than the distance from each of said plurality of first trenches to a nearest contact hole among said contact holes, and each of said first trenches has a first buried conductive layer buried therein.