Patent ID: 6855615

Claim:
A method of manufacturing a semiconductor device, comprising the steps of: forming a trench for a trench isolation structure on a primary surface of a semiconductor substrate through a mask pattern formed on the primary surface of said semiconductor substrate; forming an insulating layer on the surface of said mask pattern formed on the primary surface of said semiconductor substrate so as to fill said trench; removing said insulating layer substantially to the height of the primary surface of said mask pattern; removing said mask pattern; and removing said insulating layer at least at a portion adjoining said semiconductor substrate to recede from the primary surface of said semiconductor substrate by a predetermined depth thereby forming a trench isolation structure so that an obtuse angle is formed between the primary surface of said semiconductor substrate and a side surface of the semiconductor substrate adjoining said trench isolation structure, and a curved surface is formed so as to extend from the primary surface to the side surface of said semiconductor substrate.