Patent ID: 6191002
Filing Date: 2001-02-20
Classification: H01L

Abstract:
A method of forming a trench isolation structure, comprising:a first step of forming an isolation trench in a semiconductor substrate to expose a top of the trench from a main surface of the substrate;a second step of covering said whole main surface of said substrate with a solution of a silazane perhydride polymer by spin coating, thereby forming a film of said solution covering said whole main surface of said substrate;said trench being entirely filled with said film of said solution;a third step of converting said film of said solution covering said main surface of said substrate to an oxide film of silicon covering said main surface of said substrate due to chemical reaction; anda fourth step of selectively removing said oxide film of silicon covering said main surface of said substrate, thereby leaving a part of said oxide film that is used as an isolation dielectric of a trench isolation structure in said trench.