Patent ID: 6165870
Filing Date: 2000-12-26
Classification: H01L

Abstract:
A method for fabricating an element isolation structure in a semiconductor device, comprising the steps of:forming a pad oxide film over a semiconductor substrate;forming a nitride film pattern over said semiconductor substrate except for a portion will be formed an element insulating film;forming spacers at side walls of the nitride film pattern;implanting ions into said semiconductor substrate disposed beneath said pad oxide film exposed between said side walls using said spacers and said nitride film pattern as a mask, thereby forming an ion-implanted region;selectively removing said pad oxide film, said ion-implanted region, and said semiconductor substrate using said nitride film pattern and said spacer as a mask, thereby forming a trench in said semiconductor substrate;removing said ion-implanted region remaining after said selective removal thereof;forming a trench oxide film over the entire exposed surface of the resulting structure obtained after said removal of said ion-implanted region, thereby filling the trench; andselectively removing said trench oxide film and said spacers in accordance with a blanket etching process, thereby forming an element isolating film.