Patent ID: 8252698

Claim:
A substrate processing method comprising: obtaining a substrate in which a processing target layer, an intermediate bottom antireflection coating (BARC) layer, and a mask layer are stacked one on top of another, the mask layer including a photoresist film having an opening that partially exposes the BARC layer; increasing a thickness of the mask layer by depositing deposits on an upper surface of the mask layer with plasma generated from a first gas; etching the BARC layer exposed through the opening with plasma generated from a second gas so that a surface of the processing target layer is partially exposed through the opening; and etching the processing target layer exposed through the opening, wherein the first gas is a gaseous mixture of SF 6 gas and a depositive gas represented in a general equation C x H y F z , where x, y, and z are positive integers, and wherein a composition of the second gas is different from a composition of the first gas.