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3D MEMS device with hermetic cavity

  • US 10,407,299 B2
  • Filed: 01/14/2016
  • Issued: 09/10/2019
  • Est. Priority Date: 01/15/2015
  • Status: Active Grant
First Claim
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1. A three dimensional (3D) micro-electro-mechanical system (MEMS) device comprising:

  • a MEMS wafer including a MEMS structure, the MEMS wafer having opposed first and second sides;

    a top cap wafer and a bottom cap wafer respectively bonded to the first side and the second side of the MEMS wafer, the top cap wafer, the bottom cap wafer and the MEMS wafer being stacked along a stacking axis and together forming at least one hermetic cavity enclosing the MEMS structure, at least one of the top cap wafer and the bottom cap wafer being a silicon-on-insulator (SOI) cap wafer comprising a cap device layer, a cap handle layer and a cap insulating layer interposed between the cap device layer and the cap handle layer, one of the cap handle layer and of the cap device layer having an inner side bonded to the MEMS wafer, and the other one of the cap handle layer and of the cap device layer having an outer side with outer electrical contacts formed thereon; and

    an electrically conductive path extending through the cap handle layer and through the cap device layer of the SOI cap wafer and comprising a conducting shunt formed through the cap insulating layer, the electrically conductive path establishing an electrical connection between one of the outer electrical contacts and said at least one MEMS structure and electrically connecting the cap handle layer and the cap device layer.

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