Patent ID: 11901451
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 8:
9. A method of fabricating a semiconductor device, comprising:
placing a base material in a reaction chamber;
forming a crystalline first material layer containing a first material on the base material in-situ in the reaction chamber, wherein the first material is crystalline aluminum nitride or aluminum scandium nitride (AlScN) with a first Sc content;
forming a crystalline ferroelectric layer containing a second material on the crystalline first material layer in-situ in the reaction chamber, wherein the second material is aluminum scandium nitride (AlScN) with a second Sc content, and the second Sc content is higher than the first Sc content; and
forming a metallic gate layer containing a third material on the crystalline ferroelectric layer in-situ in the reaction chamber, wherein the third material is aluminum scandium (AlSc).