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Electroplated copper (Cu) films are often annealed during back-end processes to stabilize grain growth in order to improve their electrical properties. The effect of prebonding anneal and hence the effective initial grain size of the Cu films on the final bond quality are studied using a 300-nm-thick Cu film that was deposited on a 200-mm silicon (Si) wafer and bonded at 300°C. As compared with the...
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