Abstract
Ultrathin (10 nm) Ti films with an amorphous structure were deposited by low temperature (<500°C) plasma enhanced chemical vapor deposition (PECVD) using TiCl 4 and H 2 as reactants. Ammonia plasma was further employed topost-treat the PECVD-Ti barrier layer to improve barrier properties. An amorphous TiN x layer forms on the surface of the PECVD-Ti layer after ammonia plasma post-treatment. The resulting films have a multilayered amorphous Ti/TiN x structure. Furthermore, the effective resistivity of resulting Ti/TiN x film reduces to 122 μΩ cm. Improved barrier capability against Cu diffusion is found for the Ti/TiN x barrier layer because the Cu/TiN x /Ti/n + - p junction diodes retain low leakage current densities even after annealing at 500°C for 1 h. Ti/TiN x barrier layers present lengthened grain structures to effectively impede Cu diffusion, thus acting as much more effective barriers than are conventional Ti and TiN films.
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