TREATMENT LIQUID AND TREATMENT METHOD

原文（中国語）

An object of the present invention is to provide a treatment liquid which, in a case of being applied to an object to be treated containing a silicon-germanium-containing substance and a silicon-containing substance, selectively dissolves the silicon-germanium-containing substance and suppresses a variation in a dissolution rate between a central portion and an end portion in the silicon-germanium-containing substance. The treatment liquid of the present invention is a treatment liquid used for an object to be treated, which contains a silicon-germanium-containing substance and a silicon-containing substance, to remove at least a part of the silicon-germanium-containing substance, the treatment liquid containing a fluoride ion source, an organic acid, an oxidant, a solvent having a relative permittivity of 10 or less, and water, in which a content of the water is more than 0% by mass and less than 30% by mass with respect to the total mass of the treatment liquid.