Patent ID: 6613671
Filing Date: 2003-09-02
Classification: H01L,Y10T

Abstract:
A conductive connection forming method comprising;forming a first layer comprising copper on a substrate, the first layer having an elevational thickness; forming a second layer on the first layer, the second layer comprising palladium; transforming from about 50 to about 150 Angstroms of the first layer to a transformed material comprising a copper-palladium intermetallic material; etching with an acid comprising H2SO4 and removing substantially all of any palladium not comprised by the intermetallic material, and any portion of the intermetallic material, that is beyond the elevational thickness of the first layer and leaving a sufficient thickness of intermetallic material to reduce oxidation of the first layer, a rate of etching the second layer compared to the intermetallic material comprising greater than 5 to 1; and forming a conductive connection to the first layer by way of the transformed material.