Patent ID: 9121101
Filing Date: 2015-09-01
Classification: C09K,C23F,G03F,H01L

Abstract:
1. An etching method using an etchant including: a thermal decomposition step of thermally decomposing an oxide of copper in a copper oxide-containing layer containing the oxide of copper; and an etching step of supplying the etchant to the copper oxide-containing layer, and removing an oxide of copper that is thermally decomposed from the copper oxide-containing layer, wherein said etchant contains: at least an amino acid, a chelating agent and water, wherein concentration (weight %) of the chelating agent in the entire etchant is the concentration of the amino acid or less, and pH thereof is 6.04 to 6.34, wherein the chelating agent is ammonium oxalate, and wherein the amino acid is glycine.