Modulation of the electric properties of SnSe bi/mono-layer by strain and electrical field

The electronic properties of single/bi-layer SnSe are theoretically studied using first-principles approach based on density-functional theory (DFT). The band structure and lattice parameters are researched. In order to gain more desirable electronic property, the in-plane strain and external electric field are adopted to modulate their electronic properties. The simulation results demonstrate that no matter biaxial or uniaxial strain, the bilayer structure shows a better linearity character, but for armchair direction, the monolayer SnSe would receive a larger band gap tuning range. The biaxial strain also can induce indirect-direct band gap transformation. The electronic field Therefore, we suggest the tunable electronic property SnSe can be used as a strain or other application sensors.