Invention Application
US20120313189A1 METHOD OF PREVENTING STICTION OF MEMS DEVICES 审中-公开
防止MEMS器件的方法

METHOD OF PREVENTING STICTION OF MEMS DEVICES
Abstract:
A method and apparatus are disclosed for reducing stiction in MEMS devices. The method comprises patterning a CMOS wafer to expose Titanium-Nitride (TiN) surface for a MEMS stop and patterning the TiN to form a plurality of stop pads on the top metal aluminum surface of the CMOS wafer. The method is applied for a moveable MEMS structure bonded to a CMOS wafer. The TiN surface and/or plurality of stop pads minimize stiction between the MEMS structure and the CMOS wafer. Further, the TiN film on top of aluminum electrode suppresses the formation of aluminum hillocks which effects the MEMS structure movement.
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