Patent ID: 7871908
Filing Date: 2011-01-18
Classification: H01L,Y10S

Abstract:
1. A method of manufacturing a semiconductor device, the semiconductor device comprising a semiconductor substrate and a layer to be etched formed on the semiconductor substrate, wherein a groove and a concave portion are formed in the layer to be etched, and the concave portion is formed at a bottom of the groove and has a smaller opening portion than an opening portion of the groove, the method comprising: sequentially forming a first hard mask layer and a second hard mask layer on the layer to be etched; a first groove-forming mask pattern forming process which forms a groove-forming mask pattern which has a first pitch, is formed of the second hard mask layer, and is used as an etching mask when forming groove patterns, by a first concave portion-forming mask pattern forming process which forms a concave portion-forming mask pattern which has a third pitch substantially identical to the first pitch, is formed of the first hard mask layer, and is used as an etching mask when forming concave portion patterns, by