Patent ID: 11958740
Assignee: ROBERT BOSCH GMBH
Field: Micro-structural and nano-technology (Chemistry)
Classification: CPC B  G | IPC B

Claim 3:
4. A method for producing a microelectromechanical sensor, the method comprising:
connecting a cap wafer with a sensor wafer, the cap wafer having a bonding structure for connecting the cap wafer with the sensor wafer, the sensor wafer having a sensor core having a movable structure, and the cap wafer having a stop structure configured to limit an excursion of the movable structure;
wherein the method has a first step and a second step following the first step, a hard mask being applied onto a subregion of the cap wafer in the first step, the masked subregion of the cap wafer defining a stop surface of the stop structure, a bonding layer being applied onto the cap wafer in the second step, and the bonding structure being produced by etching the bonding layer,
in which, in a fourth step, preceding the first step, a recess is produced on a surface of the cap wafer by etching, and, in the first step, a further hard mask is applied onto a further subregion of the cap wafer, the further subregion being situated inside the recess, and the masked further subregion of the cap wafer defining a surface of a capping electrode.