New generation of Self Ionized Plasma copper seed for sub 40nm nodes
Two seed deposition hardware are compared in this paper: a standard Self Ionized Plasma (SIP) standard chamber and a new generation chamber allowing Cu deposition and re-sputtering simultaneously. TEM characterizations exhibits better features coverage for new seed generation thank to process fine tuning. It induces defectivity improvement and void density is reduced with new hardware. Furthermore, reliability performances are improved without degrading parametrical results.
re-sputtering cu seed deposition step coverage metal void electromigration