Patent ID: 8932903
Filing Date: 2015-01-13
Classification: H01L,H05K

Abstract:
1. A method for forming a wiring, comprising the steps of: forming a first conductive film comprising copper over a substrate; forming a second conductive film comprising at least one of tungsten, cobalt, nickel, tin, and molybdenum over the first conductive film; forming a resist mask over the second conductive film; etching a part of the second conductive film with use of the resist mask as a mask; oxidizing the second conductive film to oxidize copper in the first conductive film with oxygen which moves from the second conductive film to the first conductive film; removing part of the first conductive film so that the first conductive film has a taper angle greater than or equal to 15° and less than or equal to 45°; and removing the resist mask.