Patent ID: 6538325
Filing Date: 2003-03-25
Classification: H01L,H05K

Abstract:
A multi-layer conductor system comprising:a base layer having an electrically insulative top portion comprising alumina; an electrically conductive intermediate layer formed on said top portion of said base layer; and an electrically conductive top layer formed on said intermediate layer, said top layer comprising precious metal selected from the group consisting of silver and an alloy of silver; wherein said intermediate layer comprises alumina, and a precious metal alloy having silver and a metal selected from the group consisting of platinum, palladium and mixtures thereof; the amount by weight of said precious metal alloy being greater than the amount by weight of said alumina in said intermediate layer, and the amount by weight of silver in said precious metal alloy being greater than the amount by weight of said selected metal, and provided that the percentage weight of silver in said precious metal of said top layer and the percentage weight of silver in said precious metal alloy of said intermediate layer are selected to provide said intermediate layer having an amount of shrinkage with temperature that is between that of said top layer and said top portion of said base layer.