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• W2028285903 abstract "Downscaling equivalent oxide thickness (EOT) by decreasing the physical thickness or increasing the permittivity of the gate dielectric is required to reach the complementary metal-oxide semiconductor (CMOS) (sub) 45 nm node performance specifications. In this work, we study the atomic layer deposition (ALD) of hafnium silicate gate dielectrics from Hf Cl4, Si Cl4, and H2 O both experimentally and theoretically. Hafnium silicate is characterized by Rutherford backscattering, time-of-flight secondary ion mass spectroscopy, and x-ray photoelectron spectroscopy. The interaction of the precursors with the surface sites is investigated by first-principles calculations. The electrical properties are evaluated on TaN gated capacitors. The Hf Cl4 H2 O reactions create surface sites that enable the chemisorption of Si Cl4 in doses much smaller than the doses required for Si O2 ALD from Si Cl4 H2 O. The hydrolysis of Si-Cl is slower than the hydrolysis of Hf-Cl. Optimization of the hafnium silicate deposition results in a leakage current reduction of one order of magnitude for ultrascaled hafnium silicate gate stacks. At 0.9 nm EOT, a leakage current of <0.1 A cm2 is obtained for hafnium silicates with Hf content higher than 90%. © 2007 American Vacuum Society." @default.
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• W2028285903 date "2007-07-01" @default.
• W2028285903 modified "2023-10-10" @default.
• W2028285903 title "Atomic layer deposition of hafnium silicate gate dielectric layers" @default.
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• W2028285903 doi "https://doi.org/10.1116/1.2713115" @default.
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