Patent ID: 8216897
Filing Date: 2012-07-10
Classification: H01L

Abstract:
1. A method for manufacturing a semiconductor device, the method comprising: forming a device isolation structure defining an active region; forming first and second buried word lines crossing the active region; forming first and second insulation film patterns over the first and the second buried word lines; forming a line pattern including a first conductive material between the first and second insulation film patterns; depositing a hard mask film over the line pattern; patterning the hard mask film in a direction orthogonal to the first and the second buried word lines; forming a trench by patterning the line pattern using the patterned hard mask film as an etch mask, thus forming a plurality of storage node contacts; forming a third insulation film over an inner sidewall of the trench; and filling the trench with a fourth insulating film over the third insulation film.