Patent ID: 11942358
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 16:
17. A method, comprising:
forming, on a first side of a substrate, first and second stacks of semiconductor layers with an opening in between;
depositing a first flowable isolation material in the opening:
densifying the deposited first flowable isolation material with a first plasma;
removing a portion of the densified first flowable isolation material between the first and second stacks of semiconductor layers, wherein a top surface of the densified flowable isolation material is below bottom layers of the first and second stacks of semiconductor layers;
forming an epitaxial structure on the first and second stacks of semiconductor layers;
forming an etch stop layer on the epitaxial structure and the densified first flowable isolation material;
depositing a second flowable isolation material on the etch stop layer;
densifying the deposited second flowable isolation material with a second plasma;
depositing a third flowable isolation material on a second side of the substrate, wherein the second side is opposite to the first side; and
densifying the deposited third flowable isolation material with a third plasma.