公开(公告)号：US20170152136A1

公开(公告)日：2017-06-01

申请号：US15429636

申请日：2017-02-10

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： John Charles Ehmke ,  Virgil Cotoco Ararao

IPC: B81B7/00 ,  B81C1/00

CPC classification number: B81B7/0038 ,  B81B2203/0315 ,  B81C1/00269 ,  B81C1/00285 ,  B81C1/00293 ,  B81C2201/0108 ,  B81C2201/013 ,  B81C2201/0188 ,  B81C2201/0198 ,  B81C2201/053 ,  B81C2203/0109 ,  B81C2203/0118 ,  B81C2203/019 ,  B81C2203/035 ,  B82Y30/00 ,  G02B6/4204 ,  G02B6/4208 ,  G02B6/4248 ,  G02B26/001 ,  G02B26/0833 ,  H01L24/03 ,  H01L24/05 ,  H01L24/27 ,  H01L24/29 ,  H01L24/32 ,  H01L24/83 ,  H01L24/94 ,  H01L2224/03612 ,  H01L2224/03614 ,  H01L2224/039 ,  H01L2224/04026 ,  H01L2224/05083 ,  H01L2224/05109 ,  H01L2224/05123 ,  H01L2224/05138 ,  H01L2224/05163 ,  H01L2224/05166 ,  H01L2224/0517 ,  H01L2224/05562 ,  H01L2224/27462 ,  H01L2224/2747 ,  H01L2224/279 ,  H01L2224/29006 ,  H01L2224/29011 ,  H01L2224/29023 ,  H01L2224/29109 ,  H01L2224/29144 ,  H01L2224/32058 ,  H01L2224/32227 ,  H01L2224/83121 ,  H01L2224/83193 ,  H01L2224/8381 ,  H01L2224/83825 ,  H01L2224/94 ,  H01L2924/0002 ,  H01L2924/01006 ,  H01L2924/01013 ,  H01L2924/0102 ,  H01L2924/01024 ,  H01L2924/01074 ,  H01L2924/1461 ,  H01L2924/164 ,  H01L2924/00014 ,  H01L2924/01049 ,  H01L2224/03 ,  H01L2924/01042 ,  H01L2924/01072 ,  H01L2924/01004 ,  H01L2224/83 ,  H01L2224/0345 ,  H01L2224/0361 ,  H01L2224/03462

Abstract: In described examples, a hermetic package of a microelectromechanical system (MEMS) structure includes a substrate having a surface with a MEMS structure of a first height. The substrate is hermetically sealed to a cap forming a cavity over the MEMS structure. The cap is attached to the substrate surface by a vertical stack of metal layers adhering to the substrate surface and to the cap. The stack has a continuous outline surrounding the MEMS structure while spaced from the MEMS structure by a distance. The stack has: a first bottom metal seed film adhering to the substrate and a second bottom metal seed film adhering to the first bottom metal seed film; and a first top metal seed film adhering to the cap and a second top metal seed film adhering to the first top metal seed film.