Patent ID: 7432551
Filing Date: 2008-10-07
Classification: H01L

Abstract:
1. A semiconductor device, comprising: a SOI substrate in which a support substrate, an insulating layer, and an SOI layer are sequentially stacked; an element section provided in one region of said SOI substrate; and a guard ring region provided around said element section of said SOI substrate, wherein a first diffusion layer provided in said SOI layer of said element section, and a second diffusion layer provided in said SOI layer of said guard ring region are electrically connected to each other, an element separation film which does not reach said insulating layer is provided in said SOI layer, in a region between said first diffusion layer and said second diffusion layer, and a third diffusion layer which electrically connects said first diffusion layer and said second diffusion layer is provided between said element separation film and said insulating layer.