Patent ID: 8530259
Filing Date: 2013-09-10
Classification: B81B,B81C,G01C,G01P

Abstract:
1. A method of fabricating a device, the method comprising: providing a CMOS substrate having one or more electrodes and control circuitry formed in proximity to a first surface; forming a first photosensitive layer over the first surface of the CMOS substrate; patterning and etching the first photosensitive layer to form a first trench, the first trench extending to a first electrode from among the one or more electrodes; removing a remaining portion of the first photosensitive layer; forming a second photosensitive layer over the first substrate, wherein a portion of the second photosensitive layer overlays the first trench; etching the second photosensitive layer and a portion of the CMOS substrate to define a plurality of standoff structures; attaching a second substrate to the CMOS substrate, the second substrate having an upper surface and a lower surface; thinning the second substrate to a predetermined thickness; forming a third photosensitive layer over the upper surface of the second substrate; etching the third photosensitive layer and a portion of the second substrate to define a second trench; the second trench being aligned with the first trench, wherein the second trench merges with the first trench to form a continuous trench extending from the upper surface of the second substrate to the first electrode; forming a conformal adhesion layer over the upper surface of the second substrate and over sidewalls of the continuous trench; forming a conformal barrier layer over the adhesion layer; filling the continuous trench with a conductive material; forming a passivation layer over the barrier layer; and patterning and etching a portion of the second substrate to form a micro-electromechanical device.