Robert Boschgmbh

Berthold Ficker

Thomas Wahl

Harald Guenschel

A sensor element to determine the temperature or the oxygen concentration of an exhaust gas of an internal combustion engine includes a first solid electrolyte film, a second solid electrolyte film, and a diffusion barrier disposed in a layer plane between the first and the second solid electrolyte film. A gas-impermeable or at least largely gas-impermeable cover layer is provided locally on the diffusion barrier, so that in the regions in which the cover layer is provided on the diffusion barrier, diffusion of the measured gas into or out of the diffusion barrier is at least largely prevented. A corresponding method for manufacturing a sensor element includes ablating a diffusion barrier using a laser in order to adjust the diffusion resistance of the diffusion barrier. A cover layer that, after a sintering process, is gas-impermeable or at least largely gas-impermeable is applied onto a side of the diffusion barrier that faces toward a measured gas located outside the sensor element. The cover layer is ablated in order to adjust the diffusion resistance of the diffusion barrier.

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Bamberg, Germany

Berthold Ficker