Patent ID: 8460962
Filing Date: 2013-06-11
Classification: B81B,B81C,H01H

Abstract:
1. A method of fabricating a capacitive MEMS switch, comprising: forming a driving circuitry on a semiconductor substrate; forming a first bottom electrode, a first bottom conductor and a second bottom conductor on top of the semiconductor substrate by lithographically patterning; depositing a first sacrificial film onto the semiconductor substrate wherein the first sacrificial film covers the first bottom electrode, the first bottom conductor and the second bottom conductor; lithographically patterning and etching the first sacrificial film to form etch holes onto part of the first bottom conductor and the second bottom conductor; depositing a second sacrificial film topping the remaining first sacrificial film and the exposed portion of the first bottom conductor and the second bottom conductor; lithographically patterning a composite film comprising the first sacrificial film and the second sacrificial film to etch an open portion unto the semiconductor substrate for anchoring a suspended composite beam; depositing a top electrode film directly on the composite film and into the open portion so as to directly contact the semiconductor substrate, and lithographically patterning the top electrode film to form a first top electrode and a top conductor having a first contact tip and a second contact tip positioned corresponding to the etch holes onto part of the first bottom conductor and the second bottom conductor, respectively; depositing a dielectric layer on top of the first top electrode, the top conductor, and the composite film and lithographically patterning the dielectric layer to form the suspended composite beam; selectively removing the remaining composite film so that a bottom surface of the first top electrode directly faces an upper surface of the first bottom electrode.