Patent ID: 7493819

Claim:
A micromechanical pressure sensor system, comprising: a substrate having a front side and a back side, wherein the front side faces a medium and the back side is situated on an opposite side of the substrate from the front side; and a sensor diaphragm having at least one sensor area situated on the front side and one of a recess and a cavity situated on a side of the sensor diaphragm facing away from the front side; and a stress-decoupling arrangement situated around the sensor diaphragm, wherein the stress-decoupling arrangement is one of: a) a circular groove introduced into the front side; and b) a decoupling diaphragm which annularly surrounds the sensor diaphragm inside the substrate; wherein: the at least one sensor area is electrically contacted with the back side; the sensor system includes at least one contact hole which extends from the back side into the substrate and up to one of: a) the front side; and b) a layer provided on the front side; and at least a part of at least one of the back side and the contact hole is provided with an electrically conductive layer which includes at least one of aluminum, chromium, titanium and gold.