Patent ID: 11923374
Assignee: MONOLITHIC 3D INC.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 14:
15. A semiconductor device, the device comprising:
a first silicon layer comprising a first single crystal silicon layer;
a plurality of first transistors each comprising a single crystal channel;
a first metal layer disposed over said plurality of first transistors;
a second metal layer disposed over said first metal layer;
a third metal layer disposed over said second metal layer;
a second level comprising a plurality of second transistors, said second level disposed over said third metal layer;
a fourth metal layer disposed over said second level;
a fifth metal layer disposed over said fourth metal layer; and
a via disposed through said second level,
wherein at least one of said plurality of second transistors comprises a metal gate,
wherein an average thickness of said fifth metal layer is greater than an average thickness of said third metal layer by at least 50%, and
wherein an average thickness of said second metal layer is greater than an average thickness of said third metal layer by at least 50%.