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Recent development efforts in copper etch processing show promising results in many areas that have posed significant challenges for this new technology. We will report on etch performance for features down to 0.25pm with aspect ratios greater than 2:l. Copper etch rates of over 5000 &min have been achieved, and corrosion-free post copper etch performance has been demonstrated for periods in excess of two weeks. Electrical and device yield tests were conducted and will be presented in detail.