Patent ID: 7645678
Filing Date: 2010-01-12
Classification: H01L

Abstract:
1. A process of manufacturing a shallow trench isolation for avoiding bubble defects, comprising: providing a semiconductor substrate comprising a pad oxide layer and a pad nitride layer formed thereon; forming a photoresist layer on the pad nitride layer and performing a photolithography process to pattern the photoresist layer and expose a part of the pad nitride layer; etching the exposed pad nitride layer and the pad oxide layer underneath the pad nitride layer to form an opening; etching the semiconductor substrate through the opening to form a shallow trench; removing the photoresist layer, and thereby leading to a substance containing carbon or oxygen remaining on a bottom surface of the shallow trench; performing an RCA wet cleaning on the shallow trench, wherein the substance containing carbon or oxygen is not removable by the RCA wet cleaning; using an inert gas to bombard the bottom surface of the shallow trench to remove a surface layer of the bottom surface for removing the substance containing carbon or oxygen on the bottom surface of the shallow trench; forming an oxide liner on the surface of the shallow trench; forming a silicon nitride liner on the oxide liner; and performing a chemical vapor deposition process to deposit a dielectric layer to fill the shallow trench.