The characteristics of the high-KK Er2O3 (erbium oxide) dielectrics deposited on polycrystalline silicon

The high-kk Er2O3 films deposited on polycrystalline silicon treated with various post-rapid thermal annealing (RTA) temperatures were formed as high kk dielectrics. In order to study the annealing effects, electrical measurements, optical characterizations, and multiple material analyses techniques including X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and atomic force microscopy (AFM) were performed to examine the differences between the samples in various annealing conditions. The annealing temperature at 800 °C was the optimal condition to form a well-crystallized Er2O3 film with excellent material quality and electrical properties. RTA annealing at an appropriate annealing temperature of 800 °C might effectively mitigate the dangling bonds and traps and improve electrical and material properties of the dielectric.

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► The proper RTA annealing can form a well-crystallized Er2O3 film.
► The RTA annealing at 800 °C might effectively mitigate the dangling bonds and traps.
► The Er2O3 after annealing may be a promising candidate as a suitable gate dielectric.