Patent ID: 6941956
Filing Date: 2005-09-13
Classification: B08B,H01L,Y10S

Abstract:
1. A substrate treating apparatus etching a high dielectric-constant film of metal oxide formed on a substrate, comprising: a first treating unit having a first treating tub storing sulfuric acid, the substrate being immersed in the sulfuric acid in the first treating tub and thereby causing the sulfuric acid to react with the metal oxide constituting the high dielectric-constant film, thereby forming a metal sulfate, and heating the sulfuric acid to a range of 150 to 200° C.; wherein said oxide is selected from the group consisting of oxides of hafnium Hf and zirconium Zr, silicate, and aluminate; and a second treating unit having a second treating tub storing deionized water, the substrate being immersed in the deionized water in the second treating tub and thereby dissolving said metal sulfate in the deionized water, thereby removing said metal sulfate from the substrate.