Patent ID: 8354215

Claim:
A method for stripping a photoresist that comprises: (I) selectively etching a low-dielectric layer provided on a substrate, where the substrate has at least a copper (Cu) wiring and the low-dielectric layer thereon, by using a photoresist pattern as a mask which is formed on the substrate; (II) contacting the substrate after the step (I), with aqueous hydrogen peroxide; and (III) contacting the substrate after the step (II), with a photoresist stripping solution that consists of (i) from 2 to 10% by mass of a quaternary ammonium hydroxide represented by the following formula (I): wherein R 1 , R 2 , R 3 and R 4 each independently represent an alkyl group having from 1 to 4 carbon atoms, (ii) from 5 to 60% by mass of water, (iii) a water-soluble organic solvent, (iv) a water-soluble amine as an optional component, (v) a corrosion inhibitor as an optional component, and (vi) an acetylene alcohol/alkylene oxide adduct as an optional component.