Patent ID: 11881443
Assignee: MONOLITHIC 3D INC.
Field: Semiconductors (Electrical engineering)
Classification: CPC H  B | IPC H

Claim 2:
3. A 3D semiconductor device, the device comprising:
a first level comprising a plurality of first metal layers;
a second level,
wherein said second level overlays said first level,
wherein said second level comprises at least one single crystal silicon layer,
wherein said second level comprises a plurality of transistors,
wherein each transistor of said plurality of transistors comprises a single crystal channel,
wherein said second level comprises a plurality of second metal layers,
wherein said plurality of second metal layers comprise interconnections between said transistors of said plurality of transistors, and
wherein said second level is overlaid by a first isolation layer; and

a connective path from said plurality of transistors to said plurality of first metal layers,
wherein said connective path comprises a via disposed through at least said single crystal silicon layer,
wherein said via comprises tungsten, and
wherein said single crystal silicon layer thickness is less than two microns.