Patent ID: 7727415
Filing Date: 2010-06-01
Classification: C23F,H01L

Abstract:
1. A fine treatment agent, which is used for the fine processing of a multilayer film including a tungsten containing film and a silicon compound containing film, comprising hydrogen fluoride, nitric acid, at least one of ammonium fluoride or ammonium chloride, and 0.001 weight percent to 0.1 weight percent of a non-ionic surfactant, wherein an etching rate for said tungsten containing film at 25° C. which is within a range from 0.5 nm/min to 5000 nm/min and an etching rate for said silicon compound containing film at 25° C. which is within a range from 0.5 times to 2 times the etching rate for said tungsten containing film at 25° C., wherein X, Y and Z satisfy the following relational expressions when the content of said hydrogen fluoride is X mol/kg the content of the nitric acid is Y mol/kg and the content of the at least one of ammonium fluoride or ammonium chloride is Z mol/kg,