Patent ID: 6634212
Filing Date: 2003-10-21
Classification: G01N

Abstract:
A high-temperature substance sensor produced by a process comprising:providing a substrate (4) having an upper side and a lower side, providing on said lower side of said substrate (4) a device (6) for raising and maintaining the temperature of the sensor, providing on said upper side of said substrate (4), using a thick layer technique, an electrically conductive layer as a precursor of a capacitor structure (38), structuring the electrically conductive layer using a photolithographic structuring process comprising applying a photosensitive resin layer upon the electrically conductive layer, applying a photo mask, which corresponds to the capacitor structure, upon the resin layer, exposing the resin layer covered with the photo mask to light, removing the exposed areas of the resin layer, and removing the areas of the electrically conductive layer not covered by resin to produce an interdigitated capacitor structure (38) with a structure size smaller than 50 &mgr;m and a thickness d greater than 4 &mgr;m, wherein in the interdigitated capacitor structure electrode fingers are interdigitated, and wherein the aspect ratio of the thickness of the electrode finger (d) to the finger breadth (b) is greater than 0.10, and providing a functional layer (18) upon said structured electrically conductive layer.