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

Claim 0:
1. 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,
wherein, in a third step, preceding the first step, an oxide layer is applied onto the cap wafer and a protective structure is produced by etching the oxide layer, the protective structure protecting the sensor core against penetration of material from the bonding structure during the connection of the cap wafer with the sensor wafer.