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

TL;DR

This study uses first-principles calculations to analyze how small organic ligands affect the electronic and dielectric properties of germanene, revealing potential for designing nanostructures for biosensors and solar cells.

Contribution

It demonstrates that organic ligand adsorption preserves germanene's structure and significantly alters its dielectric properties, enabling targeted nanostructure design.

Findings

Ligand adsorption retains germanene's structure.

Ligands are chemisorbed on germanene.

Dielectric properties show large anisotropy.

Abstract

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