Patent ID: 8052889
Filing Date: 2011-11-08
Classification: C09K,C23F,H01L

Abstract:
1. An etchant composition comprising a phosphoric acid, a nitric acid, an acetic acid, water and an additive, wherein the additive comprises a chlorine-based compound, a nitrate-based compound, a sulfate-based compound, and an oxidation regulator, wherein the phosphoric acid has a concentration of about 40 to 70 wt %, the nitric acid has a concentration of about 3 to 15 wt %, the acetic acid has a concentration of about 5 to 35 wt %, the chlorine-based compound has a concentration of about 0.02 to 5 wt %, the nitrate-based compound has a concentration of about 0.05 to 5 wt %, the sulfate-based compound has a concentration of about 0.05 to 5 wt %, the oxidation regulator has a concentration of about 1 to 10 wt %, and a quantity of water is a residual amount.