Patent ID: 11925030
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 11:
12. A method for forming a memory device, the method comprising:
depositing a memory film over a substrate;
patterning the memory film to form a plurality of trenches elongated in parallel;
performing an etch into individual sidewalls of the memory film through the trenches to form a plurality of recesses in the individual sidewalls;
depositing a metal-insulator-semiconductor (MIS) film filling the trenches and the recesses;
patterning the MIS film to form a plurality of MIS structures individual to and respectively in the recesses; and
forming a plurality of ferroelectric layers and a plurality of control gates in the trenches, wherein the ferroelectric layers, the control gates, and metal of the MIS structures form a plurality of metal-ferroelectric-metal (MFM) structures in the trenches, and wherein the plurality of control gates comprise a first control gate and a second control gate that are spaced from each other in a common trench of the plurality of trenches and that have individual sidewalls facing a continuous semiconductor segment of the MIS film on a common side of the common trench.