Invention Grant
- Patent Title: Sensor with dimple features and improved out-of-plane stiction
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Application No.: US17206079Application Date: 2021-03-18
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Publication No.: US11542154B2Publication Date: 2023-01-03
- Inventor: Ashfaque Uddin , Daesung Lee , Alan Cuthbertson
- Applicant: InvenSense, Inc.
- Applicant Address: US CA San Jose
- Assignee: InvenSense, Inc.
- Current Assignee: InvenSense, Inc.
- Current Assignee Address: US CA San Jose
- Main IPC: B81C1/00
- IPC: B81C1/00 ; B81B7/00

Abstract:
A method includes fusion bonding a handle wafer to a first side of a device wafer. The method further includes depositing a first mask on a second side of the device wafer, wherein the second side is planar. A plurality of dimple features is formed on an exposed portion on the second side of the device wafer. The first mask is removed from the second side of the device wafer. A second mask is deposited on the second side of the device wafer that corresponds to a standoff. An exposed portion on the second side of the device wafer is etched to form the standoff. The second mask is removed. A rough polysilicon layer is deposited on the second side of the device wafer. A eutectic bond layer is deposited on the standoff. In some embodiments, a micro-electro-mechanical system (MEMS) device pattern is etched into the device wafer.
Public/Granted literature
- US20220298009A1 SENSOR WITH DIMPLE FEATURES AND IMPROVED OUT-OF-PLANE STICTION Public/Granted day:2022-09-22
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