Incorporation of Chromium in Sputtered Copper Films and Its Removal During Wet Chemical Etching
In modern computing equipment, semiconductor devices are normally mounted on a substrate that acts as an interface between the circuit card or board and the silicon chip. The circuitry deposited on such substrates combined with pins through holes in the substrate material allow communication between I/O sites on a device and the card or board. In some cases the circuitry is generated by screening on a paste that, when fired, will produce lines of a conductive glass. In other cases, the metallurgy is vacuum-deposited using either evaporation or sputtering and is made of metallic components. One such metallic system consists of chromium and copper, deposited to give a Cr/Cu/Cr/ceramic film structure . These layers are deposited on the substrate and circuitry formed by photolithography followed by wet chemical etching.
KeywordsPorosity Chromium Permanganate
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