Patent ID: 7989351

Claim:
A method for manufacturing a wiring over a substrate comprising the steps of: forming a first conductive layer over an insulating surface; forming a first mask pattern over the first conductive layer; forming a second conductive layer having a first side surface having a first angle in a range of 85° to 90° with respect to a plane parallel to the insulating surface by etching the first conductive layer under a first etching condition; and forming a third conductive layer and a second mask pattern by etching the second conductive layer and the first mask pattern under a second condition, wherein the third conductive layer has at least a second side surface at a lower portion of the third conductive layer and a third side surface at an upper portion of the third conductive layer, wherein the second side surface has a second angle of inclination, wherein the third side surface has a third angle of inclination, wherein the second angle of inclination is different from the third angle of inclination, and wherein a second selective ratio under the second condition of the first mask pattern to the second conductive layer is larger than a first selective ratio under the first condition of the first mask pattern to the first conductive layer.