Patent ID: 7884413
Filing Date: 2011-02-08
Classification: H01L

Abstract:
1. A semiconductor device, comprising: a semiconductor substrate including a first upper surface and a trench; a gate insulating film formed on the first upper surface; a gate electrode formed on the gate insulating film, the gate electrode including a first side surface being flush with a second side surface of the trench; a first insulating film containing silicon oxide as a main ingredient, the first insulating film being formed in the trench and on the second side surface, a height of a second upper surface of the first insulating film being lower than a height of a third upper surface of the gate electrode relative to the first upper surface of the semiconductor substrate, the first insulating film including a recess in an upper end portion thereof; and a second insulating film containing silicon oxide as a main ingredient and formed in the recess, the second insulating film including a fourth upper surface being flush with the second upper surface of the first insulating film and a granular portion having a carbon, the granular portion located along an interface between the first and second insulating films.