Patent ID: 9556020
Date: 2017-01-31
CPC Classifications: B81B,B81C,H01L

Claim:
1. A method for wafer-level hermetic packaging of MEMS components comprising: providing a first substrate having a MEMS component, conductive leads of the MEMS component, anchors that keep some part of the MEMS component at a predefined offset from a surface of the first substrate, and a sealing region that completely surrounds the MEMS component and the conductive leads; providing a second substrate comprising a first silicon layer, a second silicon layer, and a buried oxide layer sandwiched between the first silicon layer and second silicon layer, the second substrate having a number of vertical feedthroughs formed using the first silicon layer and a sealing wall formed using the first silicon layer, the sealing wall completely surrounding the vertical feedthroughs, a roof formed using the second silicon layer and buried oxide layer and completely covering the region surrounded by the sealing wall from the top, a number of via openings formed using the second silicon layer and buried oxide layer and reaching to the top surfaces of the vertical feedthroughs through the roof, and a cavity surrounded by the sealing wall and the roof; bonding the sealing region of the first substrate to the sealing wall of the second substrate in such a way that the MEMS component on the first substrate is encapsulated in a closed volume defined by the first substrate and the cavity of the second substrate, and simultaneously, bonding the conductive leads on the first substrate to the corresponding vertical feedthroughs on the second substrate; forming wire bonding pads on the exposed surfaces of the vertical feedthroughs that are exposed to the via openings on the second substrate; providing an isolation layer has been deposited over the second substrate that covers the exposed surfaces of the second substrate and the via opening has been refilled with an electrical conductor in order to get electrical contract from the vertical feedthrough.