Patent ID: 8980121
Filing Date: 2015-03-17
Classification: C23F,H01L,H05K

Abstract:
1. An etching liquid, consisting of: (A) from 4.5 to 7.5% by mass of hydrogen peroxide; (B) from 3 to 6% by mass of nitric acid; (C) from 0.1 to 0.5% by mass of a fluoride ion source; (D) from 0.1 to 0.5% by mass of an azole; (E) from 3 to 6% by mass of a quaternary ammonium hydroxide; and (F) from 0.01 to 0.1% by mass of a hydrogen peroxide stabilizer, wherein the etching liquid has a pH of from 1.5 to 2.5.