Patent ID: 8383517
Filing Date: 2013-02-26
Classification: H01L

Abstract:
1. A method of processing a substrate having a silicon base material and a hard mask made of a silicon nitride film and/or a silicon oxide film and formed on the silicon base material, the hard mask having an opening to which the silicon base material is at least partially exposed, comprising: a dry etching step of forming a concave portion corresponding to the opening in the silicon base material using plasma produced from halogenated gas; and a deposit removing step of heating the substrate to a temperature of not less than 200° C. so that water molecules contained in the silicon nitride film and the hard mask are evaporated and so that water molecules contained in the deposit produced in said dry etching step remain and supplying hydrogen fluoride gas toward the substrate which has been heated so as to remove only the deposit through a reaction between the deposit and the hydrogen fluoride gas, wherein said deposit removing step is carried out after said dry etching step.