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• W2395854906 abstract "Tungsten carbides (WCx) thin films were deposited on thermally grown SiO2 substrates by atomic layer deposition (ALD) using a fluorine- and nitrogen-free W metallorganic precursor, tungsten tris(3-hexyne) carbonyl [W(CO)(CH3CH2C ≡ CCH2CH3)3], and N2 + H2 plasma as the reactant at deposition temperatures between 150 and 350 °C. The present ALD-WCx system showed an ALD temperature window between 200 and 250 °C, where the growth rate was independent of the deposition temperature. Typical ALD characteristics, such as self-limited film growth and a linear dependency of the film grown on the number of ALD cycles, were observed, with a growth rate of 0.052 nm/cycle at a deposition temperature of 250 °C. The ALD-WCx films formed a nanocrystalline structure with grains, ∼2 nm in size, which consisted of hexagonal W2C, WC, and nonstoichiometric cubic β-WC1−x phase. Under typical deposition conditions at 250 °C, an ALD-WCx film with a resistivity of ∼510 μΩ cm was deposited and the resistivity of the ALD-WCx film could be reduced even further to ∼285 μΩ cm by further optimizing the reactant pulsing conditions, such as the plasma power. The step coverage of ALD-WCx film was ∼80% on very small sized and dual trenched structures (bottom width of 15 nm and aspect ratio of ∼6.3). From ultraviolet photoelectron spectroscopy, the work function of the ALD-WCx film was determined to be 4.63 eV. Finally, the ultrathin (∼5 nm) ALD-WCx film blocked the diffusion of Cu, even up to 600 °C, which makes it a promising a diffusion barrier material for Cu interconnects." @default.
• W2395854906 created "2016-06-24" @default.
• W2395854906 creator A5038067008 @default.
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• W2395854906 date "2016-05-26" @default.
• W2395854906 modified "2023-09-25" @default.
• W2395854906 title "Atomic layer deposited nanocrystalline tungsten carbides thin films as a metal gate and diffusion barrier for Cu metallization" @default.
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• W2395854906 doi "https://doi.org/10.1116/1.4951691" @default.
• W2395854906 hasPublicationYear "2016" @default.
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