Method for treating object to be treated and treatment liquid

Abstract

An object of the present invention is to provide a treatment method excellently flattens an object to be treated in a case where the treatment method is applied to an object to be treated having a metal layer. Another object of the present invention is to provide a treatment liquid for an object to be treated. The method for treating an object to be treated according to an embodiment of the present invention is a method for treating an object to be treated having a step A of performing an oxidation treatment on an object to be treated having a metal layer so as to form a metal oxide layer and a step B of bringing a treatment liquid into contact with the object to be treated obtained by the step A so as to dissolve and remove the metal oxide layer, in which the treatment liquid contains an organic solvent and an acidic compound, and a content of the organic solvent is 50% by mass or more with respect to a total mass of the treatment liquid.

Dependencies are inferred from the claim text.