Patent ID: 11862476
Assignee: SAMSUNG ELECTRONICS CO., LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 10:
11. A method of forming a semiconductor device comprising:
forming a lower oxide semiconductor layer having a first atomic concentration of oxygen on a semiconductor substrate by sputtering a target including an amorphous oxide semiconductor in a chamber at a first partial pressure of oxygen;
forming an upper oxide semiconductor layer having a second atomic concentration of oxygen that is greater than the first atomic concentration of oxygen, on the lower oxide semiconductor layer by sputtering the target in the chamber at a second partial pressure of oxygen that is greater than the first partial pressure of oxygen;
forming at least one active pattern in the lower oxide semiconductor layer and the upper oxide semiconductor layer by patterning the upper oxide semiconductor layer and the lower oxide semiconductor layer; and
forming a trench in the at least one active pattern that extends through the upper oxide semiconductor layer into the lower oxide semiconductor layer,
wherein the lower portion forms a channel region and the upper portion forms a source/drain region.