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Copper dual-damascene (DD) interconnects are fabricated with low-k organic film (SiLKtrade) without any etch-stop layers by use of dual hard mask (dHM) process combined with sidewall-hardening etching step. It is a key point to reduce shoulder loss during trench etching at connecting regions of vias and trenches, so that hardening of the via-sidewall by fluorocarbon plasma during via etching is implemented...
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