Sc2C(OH)2 is a prototypical non-magnetic member of MXenes, a promising transition-metal-based 2D material family, with a direct bandgap. We provide here a benchmark of its fundamental gap Δ obtained from many-body GW and fixed-node diffusion Monte Carlo methods. Both approaches independently arrive at a similar value of Δ ∼ 1.3 eV, suggesting the validity of both methods. Such a bandgap makes Sc2C(OH)2 a 2D semiconductor suitable for optoelectronic applications. The absorbance spectra and the first exciton binding energy (0.63 eV), based on the Bethe-Salpeter equation, are presented as well. The reported results may serve to delineate experimental uncertainties and enable selection of reasonable approximations such as density functional theory functionals, for use in modeling of related MXenes.

ATRI Slovak University of Technology in Bratislava J Bottu 25 917 24 Trnava Slovakia

Department of Physics University of Ostrava 30 dubna 22 701 03 Ostrava Czech Republic

Citace poskytuje Crossref.org

Modeling size and edge functionalization of MXene-based quantum dots and their effect on electronic and magnetic properties