Patent ID: 7235883
Filing Date: 2007-06-26
Classification: H01L,H05K

Abstract:
1. A layered wiring line of silver or silver alloy comprising: a silver or silver alloy conductor layer including silver or silver alloy; and a protective conductor layer layered on and covering said silver or silver alloy conductor layer, wherein a thickness of said protective conductor layer is set in such a manner that, in a case that said silver or silver alloy conductor layer and the protective conductor layer keep in contact with a liquid etchant, a ratio of Tp/Ts is less than that of Vp/Vs, wherein Tp denotes said protective conductor layer's thickness, Ts denotes said silver or silver alloy conductor layer's thickness, Vp denotes a solution velocity of said protective conductor layer in said liquid etchant, and Vs denotes a solution velocity of said silver or silver alloy conductor layer in said liquid etchant.