Patent ID: 8614138

Claim:
A manufacturing method of a semiconductor device, the method comprising: forming a lower mask film on a semiconductor substrate; forming a barrier film made of a material different from that of the lower mask film on the lower mask film in a first area without forming the barrier film in a second area; forming an upper mask film made of a material different from that of the barrier film on the lower mask film and the barrier film; forming an upper mask member, a barrier member, and a lower mask member respectively by selectively removing the upper mask film, the barrier film, and the lower mask film and forming an active portion by selectively removing an upper layer portion of the semiconductor substrate; removing the upper mask member and leaving the lower mask member in the first area and removing the upper mask member and the lower mask member in the second area by performing etching in a condition in which an etching rate of the upper mask member and an etching rate of the lower mask member are higher than an etching rate of the barrier member while protecting a side surface of the lower mask member; forming a conductive film so that the conductive film covers the active portion and the lower mask member; and selectively removing the conductive film by performing etching in a condition in which an etching rate of the conductive film is higher than the etching rate of the lower mask member.