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A fluxless Cu/Sn SLID bonding process was demonstrated by using intermetallic Cu3Sn layer as the oxidation barrier for Cu interconnects. Oxidation behavior of intermetallic Cu3Sn was confirmed by aging Cu and multilayer Cu/Cu3Sn films at elevated temperatures in ambient air, and measuring the oxidation level by energy dispersive x-ray microscopy (EDX). The strength of bonded interconnects were characterized...
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