Patent ID: 11916128
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 16:
17. A method of forming a semiconductor device, comprising:
providing a semiconductor substrate having first and second gate trenches formed therein;
depositing an interfacial layer in each of the first and second gate trenches;
depositing a first ferroelectric layer on the interfacial layer in each of the first and second gate trenches;
removing the first ferroelectric layer from the first gate trench to expose the interfacial layer in the first gate trench;
depositing a metal oxide layer on the interfacial layer in the first gate trench and on the first ferroelectric layer in the second gate trench;
depositing a second ferroelectric layer on the metal oxide layer in each of the first and second gate trenches;
removing the second ferroelectric layer from the second gate trench to expose the metal oxide layer in the second gate trench;
depositing a first gate electrode on the second ferroelectric layer in the first gate trench; and
depositing a second gate electrode on the metal oxide layer in the second gate trench.