Patent ID: 8043891
Filing Date: 2011-10-25
Classification: B81C

Abstract:
1. A method of encapsulating a wafer level microdevice comprising: a step of fabricating the wafer level microdevice on a top side of a first silicon wafer comprises: depositing and patterning a pattern of a sacrificial carbon film on the top side of the first silicon wafer; depositing and patterning a pattern of a suspended structural film onto the sacrificial carbon film and the top side of the first silicon wafer to partially expose the sacrificial carbon film; depositing a first capping carbon film on the top side of the first silicon wafer including the sacrificial carbon film and the suspended structural film to cover the wafer level microdevice; and removing the sacrificial carbon film together with the first capping carbon film by selective gaseous reaction with carbon, so as to make the suspended structural film be suspended on the top side of the first silicon wafer including the wafer level microdevice; implementing a backside fabricating process of the first silicon wafer from a bottom side of the first silicon wafer by carrying the top side of the first silicon wafer through the first capping carbon film; and a step of encapsulating an encapsulation wafer onto the top side of the first silicon wafer comprises at least one of: producing a sealing grid surrounding the wafer level microdevice on the top side of the first silicon wafer; and encapsulating the wafer level microdevice into a capped cavity enclosed by the encapsulation wafer, the sealing grid and the top side of the first silicon wafer, by bonding the encapsulation wafer onto the sealing grid on the top side of the first silicon wafer, or producing the sealing grid on a surface of the encapsulation wafer; and encapsulating the wafer level microdevice into the capped cavity enclosed by the encapsulation wafer, the sealing grid and the top side of the first silicon wafer, by bonding the top side of the first silicon wafer onto the sealing grid on the encapsulation wafer.