Patent ID: 9676616
Date: 2017-06-13
CPC Classifications: B81B,B81C

Claim:
1. A semiconductor pressure sensor comprising: first region and second region each defined in a surface of a semiconductor substrate; a pressure sensor formed in said first region and including a fixed electrode, a void, and a movable electrode, said void being provided above said fixed electrode, said movable electrode being provided above said void; a transistor formed in said second region and including a floating gate electrode; an interlayer insulation film formed to cover said pressure sensor and said transistor; a hole formed in said interlayer insulation film and communicating with said void; a sealing portion sealing said void; and an opening formed in said interlayer insulation film to expose said movable electrode, said fixed electrode being formed as the same layer as a diffusion layer formed to extend from the surface of said semiconductor substrate to inside of said semiconductor substrate, said void being formed by removing a sacrifice film, which is a region constituted of the same film as said floating gate electrode, said movable electrode including an anchor portion which supports said movable electrode via said void relative to said fixed electrode and in which said sacrifice film is at least partially opened, said anchor portion having a first anchor provided to divide said movable electrode into a plurality of movable electrode units when viewed in a plan view such that one pair of adjacent movable electrode units of said plurality of movable electrode units divided share the same first anchor, said void including a drawn region extending to be drawn from an overlapping region to a non-overlapping region, said overlapping region overlapping with said movable electrode when viewed in a plan view, said non-overlapping region being external to said overlapping region, and said hole being provided in said first region, and said hole being formed in said non-overlapping region when viewed in a plan view.