Patent ID: 7723221

Claim:
A stacked film patterning method for obtaining a desired stacked film pattern by etching a stacked film comprising a lower layer film made of a conductive semiconductor and an upper layer film made of metal, said method comprising: a first etching process of removing a specified region of said upper layer film made of said metal by using a wet-etching method; a second etching process, following said first etching process, of removing residues of said metal not removed by said first etching process or a compound of said metal with said conductive semiconductor by using plasma of a mixed gas comprising chlorine gas and oxygen gas after completion of said first etching process; and a third etching process, following said second etching process, of removing said lower layer film made of said conductive semiconductor by using a dry-etching method after completion of said second etching process, wherein said conductive semiconductor is selected from the group consisting of micro-crystal silicon, polycrystalline silicon, amorphous silicon, and germanium polycrystalline silicon.