Patent ID: 9233839
Filing Date: 2016-01-12
CPC Classification: B81B,B81C

Claim Text:
1. A method for forming a microelectromechanical systems (MEMS) device, comprising: providing a substrate having a first portion and a second portion; fabricating a membrane type sensor on the first portion of the substrate; and fabricating a bulk silicon sensor on the second portion of the substrate, wherein fabricating the membrane type sensor further comprises: providing a conductive base over the substrate; providing a sacrificial layer over the conductive base; providing a reference element over the sacrificial layer; providing a dielectric layer over the reference element; removing a portion of the sacrificial layer between the reference element and the conductive base using a plurality of holes extending through the dielectric layer and the reference element to the sacrificial layer to form a first cavity of the membrane type sensor between the reference element and the conductive base; forming a sealing layer above the dielectric layer to seal the first cavity of the membrane type sensor by using Titanium as the sealing layer; and patterning the sealing layer over the reference element.