Abstract
A step-by-step consideration of charge transfer in the molecule-single-layer graphene-SiC substrate system is presented. At the first step, a simple model of the density of states of a single graphene monolayer adsorbed on silicon carbide (the graphene-SiC system) is suggested, which allows the calculation of the corresponding occupation numbers of graphene atoms. It is shown that the graphene monolayer accumulates a negative charge. At the second step, the graphene-SiC system is considered as a substrate that adsorbs molecules with a high electron affinity. The charge of these molecules as a function of their surface concentration is calculated. It is shown that, in the case of a monolayer coating, the negative surface charge density of molecules in the molecule-graphene monolayer-SiC substrate system is considerably higher than the surface charge density transferring from the SiC substrate to the graphene layer. This suggests that it is possible to neutralize the excess charge in the graphene layer via adsorption of proper particles on the layer.
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References
A. H. Castro Nero, F. Guinea, N. M. R. Peres, K. S. Novoselov, and A. K. Gaim, Rev. Mod. Phys. 81, 109 (2008).
S. Yu. Davydov, A. A. Lebedev, and N. Yu. Smirnova, Fiz. Tverd. Tela 51, 452 (2009) [Phys. Solid State 51, 481 (2009)].
C. Riedel, C. Coletri, T. Iwasaki, A. A. Zakharov, and U. Starke, Phys. Rev. Lett. 103, 246804 (2009).
J. Soltys, J. Piechota, M. Lopuszynski, and S. Krukovski, arXiv:10002.4717vl.
S. Yu. Davydov and A. A. Lebedev, Pis’ma Zh. Tekh. Fiz. 36(18), 55 (2010).
C. Coleti, C. Riedel, D. S. Lee, B. Krauss, L. Patthey, K. von Klitzing, J. H. Smet, and U. Starke, Phys. Rev. B 81, 235401 (2010).
W. Chen, S. Chen, D. Chen Qi, X. Y. Gao, and A. T. S. Wee, J. Am. Chem. Soc. 129, 10422 (2007).
H. Pinto, R. Jones, J. P. Goss, and P. R. Briddon, J. Phys.: Condens. Matter 21, 402001 (2009).
P. W. Anderson, Phys. Rev. 124, 41 (1961).
D. M. Newns, Phys. Rev. 178, 1123 (1969).
S. Yu. Davydov, Fiz. Tverd. Tela 20, 1752 (1978) [Sov. Phys. Solid State 20, 1013 (1978)].
S. Yu. Davydov and A. V. Pavlyk, Fiz. Tekh. Poluprovodn. 35, 831 (2001) [Semiconductors 35, 796 (2001)].
S. Yu. Davydov and S. V. Troshin, Fiz. Tverd. Tela 49, 1508 (2007) [Phys. Solid State 49, (2007)].
P. R. Wallace, Phys. Rev. 71, 622 (1947).
S. Yu. Davydov and G. I. Sabirova, Fiz. Tverd. Tela 53(3) (2011, in press).
J. P. Muscat and D. M. Newns, J. Phys. C: Solid State Phys. 7, 2630 (1974).
A. Mattausch and O. Pankratov, Phys. Rev. Lett. 99, 076802 (2007).
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Original Russian Text © S.Yu. Davydov, 2011, published in Fizika i Tekhnika Poluprovodnikov, 2011, Vol. 45, No. 5, pp. 629–633.
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Davydov, S.Y. On charge transfer in the adsorbed molecules-graphene monolayer-SiC substrate system. Semiconductors 45, 618–622 (2011). https://doi.org/10.1134/S1063782611050083
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DOI: https://doi.org/10.1134/S1063782611050083