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

Claim 10:
11. A substrate processing apparatus, comprising:
a substrate holder that holds 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 an etched layer made of metal or a metal compound; and
a processing liquid supplier that supplies a substrate processing liquid to the substrate held by the substrate holder, wherein:, the substrate processing liquid includes 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; and
the substrate processing liquid is adjusted to a pH value that is equal to or more than 8 but no more than 9.