Patent ID: 9040334
Filing Date: 2015-05-26
Classification: B81B,B81C,G01C,G01L,G01P

Abstract:
1. A method for forming a micro-electromechanical (MEMS) device comprising: providing a MEMS wafer, wherein the MEMS wafer comprises: bonding a carrier wafer having a first cavity to the MEMS wafer, wherein bonding the carrier wafer includes aligning the first cavity with the first portion of the polysilicon layer; patterning the MEMS substrate; removing portions of the sacrificial layer to form first and second MEMS structures, wherein the first MEMS structure corresponds to the first portion of the polysilicon layer; bonding a cap wafer to the MEMS wafer, wherein bonding the cap wafer forms a first sealed cavity comprising the first portion of the polysilicon layer and the first MEMS structure, and wherein the second MEMS structure is disposed between the second portion of the polysilicon layer and the cap wafer in a second sealed cavity; and removing portions of the carrier wafer to expose the first cavity to ambient pressure.