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The impacts of thermal annealing on the interfacial reactions and bonding structures between the tungsten metal gate and CeO2/La2O3 stacked dielectrics were investigated by x-ray photoelectron spectroscopy (XPS) measurements. We found that the amount of W oxidation increases with the depth closer to the CeO2 layer. In addition, as the annealing temperature increases to 600 °C, out-diffusion of Ce...
In future nanoscale complementary metal-oxide-semiconductor (CMOS) devices, the high dielectric constant (high-k) gate dielectric film will be shrunk down to a couple of nanometers or down to the sub-nanometer range in the sense of oxide equivalent thickness (EOT). However, as high-k materials, including La 2 O 3 which has been considered to be one of the promising next generation...
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