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Optical properties of Mg-doped VO2: Absorption measurements and hybrid functional calculations
3. G. B. Smith and C. G. Granqvist, Green Nanotechnology: Solutions for Sustainability and Energy in the Built Environment (CRC, Boca Raton, FL, 2010).
10. F. Wooten, Optical Properties of Solids (Academic, New York, 1972).
11. H. W. Verleur, A. S. Barker, Jr., and C. N. Berglund, Phys. Rev. 172, 788 (1968);
11.Specifically, Eg1 is in excellent agreement with recent observations for VO2 films made by sputtering of vanadium followed by post oxidation [ Z. Luo, Z. Wu, X. Xu, T. Wang, and Y. Jiang, J. Vac. Sci. Technol. A 28, 595 (2010);
11.it is also consistent with band gaps for some sol-gel-prepared VO2 films [ M. M. Qazilbash, A. A. Schafgans, K. S. Burch, S. J. Yun, B. G. Chae, B. J. Kim, H. T. Kim, and D. N. Basov, Phys. Rev. B 77, 115121 (2008)],
11.bcc-type VO2 nanorod arrays [ Y. Q. Wang, Z. J. Zhang, Y. Zhu, Z. C. Li, R. Vajtai, L. J. Ci, and P. M. Ajayan, ACS Nano 2, 1492 (2008)],
11.and over-stoichiometric vanadium surfaces [ A. Z. Moshfegh and A. Ignatiev, Thin Solid Films 198, 251 (1991)]. Band gaps evaluated from (αħω)2 vs ħω—as would be adequate for direct-allowed transitions—may appear as much as ∼1 eV wider than if the assessment is for indirect-allowed transitions.
12. G. Wyszecki and W. S. Stiles, Color Science: Concepts and Methods, Quantitative Data and Formulae, 2nd ed. (Wiley, New York, 2000).
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