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

Claim 8:
9. A method, comprising:
forming, on a substrate, first and second stacks of semiconductor layers with a first opening in between;
depositing a first flowable isolation material in the first opening;
densifying the deposited first flowable isolation material with a first plasma under a temperature less than about 500° C.;
forming a first epitaxial structure on the first stack of semiconductor layers and a second epitaxial structure on the second stack of semiconductor layers;
forming an etch stop layer on the first and second epitaxial structures and the densified first flowable isolation material between the first and second epitaxial structures, wherein a second opening forms between the etch stop layer on the first epitaxial structure and the etch stop layer on the second epitaxial structure;
depositing a second flowable isolation material on the etch stop layer and between the first and second epitaxial structures to fill the second opening, wherein a portion of the second flowable isolation material is below the first and second epitaxial structures and between the first and second epitaxial structures; and
densifying the deposited second flowable isolation material with a second plasma.