Patent ID: 11862503
Assignee: MONOLITHIC 3D INC.
Field: Semiconductors (Electrical engineering)
Classification: CPC G  H  B | IPC G  H

Claim 0:
1. A method for producing a 3D semiconductor device, the method comprising:
providing a first level, said first level comprising a first single crystal layer;
forming a first metal layer on top of said first level;
forming a second metal layer on top of said first metal layer;
forming at least one second level disposed on top of or above said second metal layer;
performing a first lithography step on said second level;
forming at least one third level disposed on top of or above said at least one second level; and then
performing a second lithography step on said third level;
performing additional processing steps to form a plurality of first memory cells within said at least one second level and a plurality of second memory cells within said at least one third level,
wherein said additional processing steps comprise deposition processes and etch processes,
wherein each of said plurality of first memory cells comprises at least one second transistor,
wherein each of said plurality of second memory cells comprises at least one third transistor; and then

performing at least one deposition step that simultaneously deposits gate electrodes for both said second transistors and said third transistors.