Patent ID: 9196501
Filing Date: 2015-11-24
Classification: H01L

Abstract:
1. A method for chemical planarization comprising: preparing a treatment liquid containing a hydrosilicofluoric acid aqueous solution containing silicon dioxide dissolved in the hydrosilicofluoric acid aqueous solution at a saturated concentration; preparing a silicon dioxide film having an irregularity, the irregularity including a concave portion of silicon dioxide and a plurality of convex portions of silicon dioxide; and making a first dissolution rate larger than a second dissolution rate to remove at least a part of the silicon dioxide at the convex portions and decrease a distance between a top surface of the silicon dioxide at the convex portions and a top surface of the silicon dioxide at the concave portion, the making being performed by changing equilibrium state of the treatment liquid at areas being in contact with the convex portions in a state in which the silicon dioxide film is brought into contact with the treatment liquid, the first dissolution rate being a dissolution rate of the silicon dioxide at the convex portions with respect to the treatment liquid, and the second dissolution rate being a dissolution rate of the silicon dioxide at the concave portion with respect to the treatment liquid, wherein the changing equilibrium state includes carrying out treatment of decreasing temperature of the convex portions by bringing a temperature controlling plate into contact with the convex portions, and the temperature controlling plate is capable of being cooled, and the treatment liquid substantially contains no abrasive grain.