Patent ID: 7871908

Claim:
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 forming a first resist layer on the second hard mask layer in order to form a first resist pattern that has a second pitch and is formed of the first resist layer, and etching the second hard mask layer using the first resist pattern as an etching mask; and 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 sequentially forming a first organic layer and a second resist layer on the first hard mask layer, on which the groove-forming mask pattern is formed, in order to form a second resist pattern comprising the second resist layer having an opening portion that has a fourth pitch and the first organic layer having an opening portion that is connected to an opening portion of the second resist layer and has a smaller size than the opening portion of the second resist layer, and etching the first hard mask layer using the second resist pattern as an etching mask.