Patent ID: 6346457
Filing Date: 2002-02-12
Classification: H01L

Abstract:
A process for manufacturing a semiconductor device comprising:depositing a polish-stopper film on a semiconductor substrate, applying a photoresist on the polish-stopper film and removing the photoresist from a region for forming a device isolation region to form an opening; dry etching using the photoresist as an etching mask to form a trench of a predetermined depth in the semiconductor substrate; removing the photoresist; forming a first insulating film and a second insulating film each at least partially below a surface of the polish-stopper film, in sequence to bury the trench, the second insulating film being capable of being etched by the same etching step as that for the first insulating film and having an etching rate greater than that of the first insulating film; polishing the first and second insulating films by CMP method until a surface of the polish-stopper film is exposed; removing the polish-stopper film; and removing the first and second insulating films projecting from a surface of the semiconductor substrate by etching using the same etchant so that the second insulating film is entirely removed and at least part of the first insulating film remains in the trench, thereby to form a device isolation region in the trench.