Patent ID: 11908938
Assignee: SCREEN HOLDINGS CO., LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H  C | IPC C  H

Claim 0:
1. A substrate processing liquid for removing an etched layer by being supplied to a substrate having a trench structure in which a narrow space is formed by an opening having a narrow width, a bottom wall facing the opening and one or more side walls extending toward the opening and at least either the bottom wall or the side wall is formed by the etched layer made of metal or a metal compound, the liquid comprising:
a chemical liquid containing H2O2 molecules or HO2+ functioning as an etchant for etching the metal; and
a complex forming agent containing NH4+ and forming a complex with ions of the metal, wherein
a pH is adjusted to a value that is equal to or more than 8 but no more than 9.