Invention Grant
- Patent Title: Capacitive MEMS-sensor element having bond pads for the electrical contacting of the measuring capacitor electrodes
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Application No.: US15059630Application Date: 2016-03-03
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Publication No.: US09725300B2Publication Date: 2017-08-08
- Inventor: Heiko Stahl , Arnim Hoechst , Bernhard Gehl , Rolf Scheben , Benedikt Stein
- Applicant: Robert Bosch GmbH
- Applicant Address: DE Stuttgart
- Assignee: Robert Bosch GmbH
- Current Assignee: Robert Bosch GmbH
- Current Assignee Address: DE Stuttgart
- Agency: Norton Rose Fulbright US LLP
- Agent Gerard Messina
- Priority: DE102015205384 20150325
- Main IPC: H01L29/84
- IPC: H01L29/84 ; B81B3/00

Abstract:
Measures for reducing parasitic capacitances in the layer structure of capacitive MEMS sensor elements, in which parasitic capacitances between bond pads for electrically contacting measuring capacitor electrodes and an electrically conductive layer lying underneath are reduced by these measures. The sensor structure having the measuring capacitor electrodes and bond pads of such MEMS components are in a layer structure on a semiconductor substrate. The carrier layer directly underneath the bond pad structure is uninterrupted in the bond pad region, and the layer structure includes at least one insulation layer by which at least one of the bond pads is electrically insulated from an electrically conductive layer lying underneath. At least one layer under the carrier layer is structured in the region of this bond pad, so that hollow spaces are situated in the layer structure underneath this bond pad, by which the parasitic capacitance between this bond pad and the conductive layer lying underneath is reduced. Alternatively/additionally, the material of the conductive layer in the region underneath this bond pad is replaced by electrically conductive material at least in the upper layer region, so that the insulation layer in the region of this bond pad is considerably thicker than outside the bond pad region.
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