Patent ID: 6555481
Filing Date: 2003-04-29
Classification: H01L

Abstract:
A method of manufacturing a semiconductor device, comprising the steps of:(a) forming an interlayer insulating film over a semiconductor substrate (b) forming a first mask on the interlayer insulating film, the first mask having a plurality of stripe patterns parallel to a first direction, and etching the interlayer insulating film from a surface thereof to a first intermediate depth to form grooves; and (c) forming a second mask on the resulting interlayer insulating film, the second mask having a plurality of stripe patterns parallel to a second direction crossing the first direction, and etching the interlayer insulating film through the remaining thickness thereof in the area of the grooves and not covered with the second mask to form openings, and in an area other than the area of the grooves, and not covered with the second mask, to form second grooves reaching a second intermediate depth from a surface of the interlayer insulating film, the second intermediate depth being substantially equal to said remaining thickness.