Abstract: An etchant for copper and copper alloys, includes an aqueous solution containing: 14 to 155 g/liter of cupric ion source in terms of a concentration of copper ions; 7 to 180 g/liter of hydrochloric acid; and 0.1 to 50 g/liter of azole, the azole including nitrogen atoms only as heteroatoms residing in a ring. A method for producing a wiring by etching of copper or copper alloys, includes the step of: etching a portion of a copper layer on an electrical insulative member that is not covered with an etching resist using the above-described etchant so as to form the wiring. Thereby, a fine and dense wiring pattern with reduced undercut can be formed.

Abstract: A method for manufacturing a substrate according to the present invention includes the steps of positioning a copper layer forming material including a constituent material of a copper layer and a base such that the base faces the copper layer forming material in a position vertically above the copper layer forming material; and vapor-depositing copper on the base by heating the copper layer forming material to a temperature range of 90 to 200° C. and heating the base to a temperature range of 120 to 450° C., thereby forming the copper layer. Thus, a method for manufacturing a substrate that includes a fine copper layer having a high copper purity with safety at low cost, which is suitable for manufacturing a semiconductor substrate, an electronic substrate, etc. is provided, and a vapor deposition apparatus used for the method is provided.

Abstract: An etchant for copper and copper alloys, includes an aqueous solution containing: 14 to 155 g/liter of cupric ion source in terms of a concentration of copper ions; 7 to 180 g/liter of hydrochloric acid; and 0.1 to 50 g/liter of azole, the azole including nitrogen atoms only as heteroatoms residing in a ring. A method for producing a wiring by etching of copper or copper alloys, includes the step of: etching a portion of a copper layer on an electrical insulative member that is not covered with an etching resist using the above-described etchant so as to form the wiring. Thereby, a fine and dense wiring pattern with reduced undercut can be formed.