Patent ID: 8242545

Claim:
A device for detecting a gas or gas mixture with a first and a second sensor, wherein the first gas sensor is a MOSFET comprising: a first source, a first drain, a first channel zone disposed between the first source and the first drain, and a first gas sensitive layer capacitively coupled to the first channel zone and reacts to a change in the concentration of the gas to be detected with a change in its work function, wherein the second gas sensor has in a semiconductor substrate: a second source, a second drain, and a second channel zone between the latter elements that is capacitively coupled via an air gap to a suspended gate comprising a second gas sensitive layer that reacts to a change in the concentration of the gas to be detected with a change in its work function, wherein the second gas sensitive layer is disposed on a support layer and faces the air gap, wherein the support layer is formed by a second semiconductor substrate, and wherein the first gas sensor is integrated in the front side of the second semiconductor substrate facing away from the air gap.