Abstract
We reported filling of nanoscale holes with high aspect ratio by Cu electroplating with a supercritical carbon dioxide suspension (EP-SCS). The Cu film electrodeposited by the EP-SCS was smooth. The nanoscale holes with 70nm in diameter and aspect ratio of 2 and 5 can be filled by electrodeposited Cu with no voids and pinholes by the EP-SCS. Gap-filling capability of the EP-SCS is high for the nanoscale holes with high aspect ratio even when using Cu electrolyte originally designed to fill holes with 70nm diameter and aspect ratio 1 by conventional method.
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