Patent ID: 9620373
Date: 2017-04-11
CPC Classifications: B81B,B81C,H01L

Claim:
1. A method for fabricating a semiconductor or micromachined device with a metal structure, the method comprising: patterning a mask over a substrate, wherein the mask includes an opening perimeter bounding a mask opening, wherein the opening perimeter is rectangular; performing an isotropic etch process to etch a shallow portion of the substrate exposed by the mask opening and a shallow portion of the substrate underlying the opening perimeter of the mask and forming a shallow recess having a substantially circular cross section; performing an anisotropic etch process to etch a deep portion of the substrate exposed by the mask opening and a deep portion of the substrate underlying the opening perimeter of the mask to form a cavity having a bottom surface; and depositing metal over the mask, into the mask opening and onto the bottom surface, wherein the metal on the bottom surface forms the metal structure.