Patent ID: 8329553
Filing Date: 2012-12-11
Classification: H01L

Abstract:
1. A method for manufacturing semiconductor device comprising: forming a plurality of trenches having at least two kinds of aspect ratios on a semiconductor substrate; filling the plurality of trenches with a coating material containing silicon; forming a mask on the coating material over a portion of the trenches among the plurality of trenches filled with the coating material; implanting an ion for accelerating oxidation of the coating material into the coating material in the trenches on which the mask is not formed; forming a first insulating film by oxidizing the coating materials into which the ion is implanted; after removing the mask, completely removing the coating material from the portion of the trenches previously covered by the mask; and forming a second insulating film in the portion of the trenches from which the coating material is removed, an insulating property of the second insulating film being higher than an insulating property of the first insulating film.