Patent ID: 9200974
Filing Date: 2015-12-01
Classification: F02D,G01L,H01L

Abstract:
1. A semiconductor pressure sensor device disposed in an exhaust system of an internal combustion engine, comprising: a diaphragm, disposed on a semiconductor substrate, which is strained in accordance with a pressure; strain gauges connected to and disposed on the diaphragm; a metal wiring layer connected to the strain gauges and disposed on the semiconductor substrate via an interlayer insulating film; a passivation film having an opening portion from which the metal wiring layer is exposed; an adhesion securing and diffusion preventing layer, disposed on the passivation film, which coats the exposed top, and the edge portion, of the metal wiring layer; and a conductive layer configuring a pad electrode stacked on the adhesion securing and diffusion preventing layer, wherein the edge face of a stacked metal layer configured of the adhesion securing and diffusion preventing layer and conductive layer is of a normal tapered shape or stepped shape which expands toward the semiconductor substrate side.