Patent ID: 9566790
Date: 2017-02-14
CPC Classifications: B41J,H05K,Y10T

Claim:
1. A method of forming a stacked wiring comprising: forming a first adhesion layer on a substrate; forming a first wiring on the first adhesion layer; etching the first adhesion layer and the first wiring in a same first wet etching step so that the first wiring is in a reverse trapezoid shape in which a first width of a top surface is larger than a second width of a bottom surface contacting the first adhesion layer as seen in a cross-section direction intersecting with a first wiring extending direction; covering the top surface and a side surface of the first wiring with a second adhesion layer; forming a second wiring on the second adhesion layer; and etching the second adhesion layer and the second wiring in a same second wet etching step so that the second adhesion layer and the second wiring only remain on the top surface of the first wiring, wherein the first and second adhesion layers are formed of nichrome, and the first and second wirings are formed of gold.