Patent ID: 8975155
Filing Date: 2015-03-10
Classification: H01L

Abstract:
1. A method of forming a shallow trench isolation structure, comprising: forming a trench in a substrate, wherein the trench has sidewalls and a bottom surface; forming a silicon oxide liner on the sidewalls and the bottom surface; depositing a silicon liner layer over the silicon oxide liner; filling a first silicon oxide in the trench, the first silicon oxide being a flowable silicon oxide; curing and densifying the first silicon oxide; after the curing and densifying, removing a first portion of the first silicon oxide in the trench, a second portion of the first silicon oxide remaining in the trench; depositing a second silicon oxide in the trench, the second silicon oxide not being a flowable silicon oxide; planarizing the second silicon oxide and the substrate; and after the planarizing, further densifying the second portion of the first silicon oxide.