Patent ID: 8241511

Claim:
A substrate processing method to process a substrate including at least a base layer, a process layer, a first intermediate layer, and a first mask layer stacked in this order, the first mask layer including a first aperture configured to expose a portion of the first intermediate layer, the substrate processing method comprising: a first material deposition step of depositing a material on a side surface of the first aperture and exposing a portion of the process layer by etching the exposed portion of the first intermediate layer by plasma generated from a deposit gas; a first etching step of forming a second aperture configured to expose a portion of the base layer by etching the exposed portion of the process layer; an ashing step of ashing the first intermediate layer and the first mask layer which are stacked over the process layer; a layer stacking step of stacking a second intermediate layer and a second mask layer in this order, the second mask layer having a third aperture configured to expose a portion of the second intermediate layer except for over the second aperture; a second material deposition step of depositing a material on a side surface of the third aperture and exposing another portion of the process layer by etching the second intermediate layer which is exposed by another plasma generated from another deposit gas; and a second etching step of etching said another exposed portion of the process layer.