Semiconductor device and method for manufacturing the same

1. A method for manufacturing a semiconductor device, comprising:

forming a conductive pattern over a semiconductor substrate;

forming a cover insulating film containing impurities over the conductive pattern;

forming an insulating film over the cover insulating film;

forming an impurity layer in the insulating film by ion-implanting impurities into a predetermined depth of the insulating film, where the impurities being a same kind as the impurities contained in the cover insulating film;

modifying the impurity layer to form an etching stopper film by annealing the insulating film after the impurity layer is formed;

forming a mask film provided with an opening over the insulating film;

forming, over the mask film, a resist pattern provided with a window over the opening;

forming a first hole overlapping with the opening in the insulating film over the etching stopper film, by etching the insulating film through the window;

forming a second hole in the etching stopper film by etching the etching stopper film through the first hole;

forming a groove in the insulating film over the etching stopper film by etching the insulating film through the opening, and forming a third hole in the insulating film over the conductive pattern by etching, through the second hole, the insulating film lower than the etching stopper film;

etching the etching stopper film and the cover insulating film at the same time to expose the conductive pattern in the third hole by removing the cover insulating film under the third hole, and removing the etching stopper film under the groove; and

embedding a wiring in the groove and the third hole, the wiring being electrically connected to the conductive pattern.