Adhesion, Copper Voiding, and Debonding Kinetics of Copper/Dielectric Diffusion Barrier Films
Ryan P. Birringer, Roey Shaviv, Thomas Mountsier, Jon Reid, Jian Zhou, Roy H. Geiss, David T. Read, Reinhold Dauskardt
Effects of the chemistry of electroplated copper films on stress-induced voiding and adhesion between the films and a SiN barrier layer are reported. The void density as observed by scanning electron microscopy decreased markedly with increasing Cu purity. Measurements of interface fracture energy by the four-point-bend technique showed that the Cu/SiN adhesion improves with the purity of the Cu. For Cu with intermediate purity, both wet oxidizing environments and reducing environments reduced the adhesion. In tests conducted with electrical current flowing through the Cu layer, higher current densities were correlated with higher adhesion. It is expected that data from four-point-bend tests of interfacial adhesion of current-carrying Cu films will be valuable in understanding the mechanisms and kinetics of both stress-induced voiding and electromigration voiding in Cu films with adherent barrier layers.
, Shaviv, R.
, Mountsier, T.
, Reid, J.
, Zhou, J.
, Geiss, R.
, Read, D.
and Dauskardt, R.
Adhesion, Copper Voiding, and Debonding Kinetics of Copper/Dielectric Diffusion Barrier Films, Advanced Metallization Conference Proceedings 2009, Baltimore, MD, US
(Accessed December 7, 2023)