Patent ID: 8052882
Filing Date: 2011-11-08
Classification: H01L,H05K

Abstract:
1. A method of manufacturing a wiring substrate, comprising the steps of: forming a seed layer made of copper on an underlying layer; forming a copper plating layer in the opening portion in the plating resist, by an electroplating utilizing the seed layer as a plating power feeding path; removing the plating resist; obtaining the wiring layer composed of the seed layer and the copper plating layer by wet-etching the seed layer using the copper plating layer as a mask; then, without an intervening etching of the wiring layer, roughening a surface of the wiring layer by a blackening process that needle-shaped crystalline bodies containing a copper oxide as a principal component are formed on a surface of the wiring layer, wherein treatment liquid used in the blackening process includes sodium hydroxide (NaOH) and sodium chlorite (NaClO forming an insulating layer on the wiring layer; wherein a surface of the copper plating layer is etched simultaneously in the step of etching the seed layer, and an etching amount of the copper plating layer in the etching step of the seed layer prior to the blackening process is suppressed to 0.5 μm or less, thus the surface of the copper plating layer and a side surface of the seed layer are made to an uneven surface by the etching.