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Dimension-dependent band alignment and excitonic effects in graphitic carbon nitride: a many-body perturbation and time-dependent density functional theory study
Universidad de San Buenaventura-Medellín, Facultad de Ingenierías, Grupo de Investigación en Modelamiento y Simulación Computacional; Universidad de Antioquia UdeA, Instituto de Física.ORCID iD: 0000-0003-4597-6333
Universidad de Antioquia UdeA, Instituto de Física.ORCID iD: 0000-0002-7384-8999
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.
2017 (English)In: RSC Advances, ISSN 2046-2069, E-ISSN 2046-2069, Vol. 7, no 71, p. 44997-45002Article in journal (Refereed) Published
Abstract [en]

First-principles many-body theory and time-dependent density functional theory were used to study the dimension effects on the band alignment and optical properties of s-triazine and graphitic C3N4. The inclusion of quasiparticle corrections is very important to describe the quantum confinement and the enhancement of the electron-electron (e-e) interaction. The calculated quasiparticle gaps range from 4.0 eV (monolayer) to 3.21 eV (tetralayer). The position of the valence band maxima is found to be almost constant, whereas the conduction band minima show a strong quantum confinement effect with a variation of similar to 0.7 eV respective to the bulk structure. The calculated frequency-dependent imaginary part of the dielectric function using the Bethe-Salpeter equation shows prominent excitonic effects, where there is a strong redistribution of the spectral weight to lower photon energies in the ultraviolet frequencies where the major part of the absorption occurs. On the other hand, a less intense excitonic absorption in the visible region is due to light polarization perpendicular to the surface plane. In contrast, time-dependent density functional theory also shows a redistribution of the spectral weight in the ultraviolet but it fails to describe the excitonic features in the visible region.

Place, publisher, year, edition, pages
2017. Vol. 7, no 71, p. 44997-45002
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Chemical Sciences
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URN: urn:nbn:se:uu:diva-336658DOI: 10.1039/c7ra07134eISI: 000411662100047OAI: oai:DiVA.org:uu-336658DiVA, id: diva2:1170758
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Swedish Research Council
Available from: 2018-01-04 Created: 2018-01-04 Last updated: 2018-01-04Bibliographically approved

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Espinosa-Garcia, W. F.Osorio-Guillen, J. M.Araujo, Carlos Moyses
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