Patent ID: 7314809
Filing Date: 2008-01-01
Classification: H01L

Abstract:
1. A method for forming a shallow trench isolation (STI) structure with reduced stress on a substrate, comprising: forming a pad oxide on said substrate; depositing a mask layer on said pad oxide; coating a photoresist on said mask layer; removing a portion of said mask layer and said pad oxide exposed by said photoresist; removing a portion of said substrate exposed by said mask layer and said pad oxide for forming a trench; depositing an amorphous silicon layer on the surface of said trench and said mask layer; oxidizing said amorphous silicon layer for forming a liner oxide; depositing a fill layer into said trench and on a surface of said liner oxide; removing a portion of said liner oxide and said fill layer over said mask layer; and removing said mask layer, said pad oxide and a portion of said fill layer over said substrate.