Patent ID: 8997341
Filing Date: 2015-04-07
Classification: H01L,H05K,Y10T

Abstract:
1. A method for producing a substrate for mounting a semiconductor chip, comprising steps of: (a) a resist-forming step, wherein a resist is formed on a first copper layer of a stack comprising an inner board with an inner layer circuit on a surface of the inner board, and wherein the first copper layer formed on the inner board is separated by an insulating layer so as to partially connect with the inner layer circuit, at the sections other than those that are to constitute a conductor circuit, (b) a conductor circuit-forming step, wherein a second copper layer is formed by electrolytic copper plating on the sections of the first copper layer that are to constitute the conductor circuit, to obtain a conductor circuit comprising the first copper layer and the second copper layer, (c) a nickel layer-forming step, wherein a nickel layer having an average crystal grain size of at least 0.25 μm on the side opposite the conductor circuit is formed by electrolytic nickel plating on at least part of the conductor circuit, (d) a resist removal step, wherein the resist is removed, (e) an etching step, wherein the first copper layer on the sections covered by the resist is removed by etching, (f) a solder resist-forming step, wherein a solder resist is formed on the surface so that at least part of the conductor circuit on which the nickel layer has been formed is exposed, and (g) a gold layer-forming step, wherein a gold layer is formed by electroless gold plating on at least part of the conductor circuit on which the nickel layer has been formed, wherein the steps are performed in the order of (a) to (g).