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Band gap tuning and dielectric properties of small organic ligands adsorbedon bidimensional germanium monolayers (germanene) have been investigated usingfirst-principles calculations. We show that the adsorption of these smallgroups retains the initially stable free-standing pristine buckled germaniumnanostructures. Charge density and chemical bonding analysis show that theligands are chemisorbed on the germanium layers. Finally we demosntrate thatthe dielectric properties of bare and ligand adsorbed germanene have a largeanisotropy. Our findings of a finite gap shows open a path for rational designof nanostructures with possible applications in biosensors and solar cells.

Exploring charge density distribution and electronic properties of hybrid organic-germanium layers