Abstract

The formation of High-k/SiO2 dipole layer is experimentally observed as the flatband voltage shift of MIS capacitors without high-k film thickness dependence. It is also deduced from the band bending of SiO2 and high-k at the interface by using XPS measurements. As a model to explain the driving force to form the dipole, the areal density difference of oxygen atoms at high-k/SiO2 interface is taken account to predict both the direction and magnitude of the dipoles. This is the only model to give a reasonable explanation to the experimentally observed directions of the dipoles.

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