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• W2013418946 endingPage "033711" @default.
• W2013418946 startingPage "033711" @default.
• W2013418946 abstract "The recent demonstration of single-atom thick, sp3-hybridized group 14 analogues of graphene enables the creation of materials with electronic structures that are manipulated by the nature of the covalently bound substituents above and below the sheet. These analogues can be electronically derived from isolated (111) layers of the bulk diamond lattice. Here, we perform systematic Density Functional Theory calculations to understand how the band dispersions, effective masses, and band gaps change as the bulk silicon (111) layers are continuously separated from each other until they are electronically isolated, and then passivated with hydrogen. High-level calculations based on HSE06 hybrid functionals were performed on each endpoint to compare directly with experimental values. We find that the change in the electronic structure due to variations in the Si-H bond length, Si-Si-Si bond angle, and most significantly the Si-Si bond length can tune the nature of the band gap from indirect to direct with dramatic effects on the transport properties. First-principles calculations of the phonon-limited electron mobility predict a value of 464 cm2/Vs for relaxed indirect band gap Si-H monolayers at room temperature. However, for 1.6% tensile strain, the band gap becomes direct, which increases the mobility significantly (8 551 cm2/Vs at 4% tensile strain). In total, this analysis of Si-based monolayers suggests that strain can change the nature of the band gap from indirect to direct and increase the electron mobility more than 18-fold." @default.
• W2013418946 created "2016-06-24" @default.
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• W2013418946 creator A5048626847 @default.
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• W2013418946 date "2014-01-21" @default.
• W2013418946 modified "2023-09-29" @default.
• W2013418946 title "Tunable gaps and enhanced mobilities in strain-engineered silicane" @default.
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• W2013418946 doi "https://doi.org/10.1063/1.4860988" @default.
• W2013418946 hasPublicationYear "2014" @default.
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