Abstract

Thermal diffusion of copper in a Cu/TaN/Si-sub sample was investigated after annealing at 630°C for 60 min. The interface morphology, copper silicide grains and SiO2 thin layer were observed using high resolution transmission electron microscope (HRTEM). Depth profiles were obtained with an energy dispersion X-ray spectrometer (EDS) assembled in the TEM system. Based on the grain boundary theory of Fisher and the approximation solution of Le Claire, thermal diffusivity of copper into the tantalum nitride layer was estimated.

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