Current-assisted direct Cu/Cu joining

Abstract

Enhanced direct Cu/Cu joining by applying current was investigated. Joining was conducted at 240-300 degrees C for 10-50 min under 40 MPa. Current was applied to Cu wire during joining. Contact resistance of joints decreased and the fracture load of joints increased as the current increased. The joined region increased and the interface became less straight as the current increased. These results are ascribed to electromigration and joule heating effects. The enhanced diffusion contributed significantly to the joining of metals. (C) 2015 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.