Patent ID: 6780774
Filing Date: 2004-08-24
Classification: H01L

Abstract:
A method of semiconductor device isolation, which comprises the steps of:providing a semiconductor substrate where a device isolation region was defined; forming a mask on the substrate in such a manner that the device isolation region is exposed through the mask; etching the substrate using the mask to form a trench; thermally treating an inner wall of the trench using the mask under a hydrogen atmosphere; forming a first insulating layer covering the resulting inner wall of the trench, wherein the first insulating layer is formed using an epitaxial growth process; forming a second insulating layer on the mask in such a manner that the second insulating film covers the first insulating film; firstly etching the second insulating layer to expose a surface of the mask; removing the mask; secondly etching the remaining second insulating, layer until a surface of the substrate is exposed, thereby forming a device isolation film.