Patent ID: 9570338
Date: 2017-02-14
CPC Classifications: H01L

Claim:
1. A method for forming an isolation member in a trench of a substrate, the method comprising: performing a first deposition process to form a first isolation material set, which is at least partially positioned in the trench; partially removing the first isolation material set, such that a remaining portion of the first isolation material set remains in the trench; after the first isolation material set has been partially removed, performing a first fluorine-reduction process on at least the remaining portion of the first isolation material set; after the first fluorine-reduction process has been performed, performing a second deposition process to form a second isolation material set, which is at least partially positioned in the trench and includes the remaining portion of the first isolation material set; and performing a polishing process to partially remove the second isolation material set, such that a remaining portion of the second isolation material set forms the isolation member, wherein a difference between maximum isolation material height and a minimum isolation material height above a bottom side of the substrate is less than or equal to 200 angstroms before the polishing process.