Patent ID: 9123547
Filing Date: 2015-09-01
Classification: B81B,B81C,H01G,H01L

Abstract:
1. A method of forming a stacked semiconductor device, the method comprising: providing a first substrate having a front surface; etching a portion of the first substrate from the front surface to form a cavity; filling the cavity with a sacrificial material; forming a flexible dielectric membrane over the sacrificial material and the front surface of the first substrate; forming metal units over the flexible dielectric membrane; forming a cap dielectric layer over the metal units and the flexible dielectric membrane; etching portions of the cap dielectric layer to expose the metal units; forming first bonding features over the cap dielectric layer and contacting the metal units; etching portions of the cap dielectric layer and the flexible dielectric membrane, thereby forming through-holes to expose portions of the sacrificial material; removing the sacrificial material through the through-holes from the cavity, thereby forming a movable structure including the flexible dielectric membrane, the metal units and the cap dielectric layer suspending over the cavity; providing a second substrate having at least one transistor disposed over the second substrate; forming a multilayer interconnect over the at least one transistor and electrically coupled to the at least one transistor; forming metal sections over the multilayer interconnect; forming second bonding features over portions of the metal sections; and bonding the second bonding features to the first bonding features.