Modulation of the electronic properties of blue phosphorene/stanene heterostructures by electric field and interlayer distance

Abstract

Two-dimensional (2D) materials of perpendicular integration have recently emerged, which can be used to design novel electronic and optoelectronic devices. The heterostructures composed of stanene and blue phosphorene are investigated, the band structures and electronic properties of stanene/blue phosphorene are explored by using the First-principle calculation. It can be found that tuning the interlayer distance between stanene and blue phosphorene can effectively modulate the electronic structure of stanene/blue phosphorene heterostructures. The results show that the intrinsic electronic properties of stanene and blue phosphorene are well preserved in the unconstrained bilayers. Vertical positive and negative electric fields are applied in the heterostructure with electric fields between −0.6 and 0.7 V/Å, and the band gap increases with electric fields increasing. When in-plane biaxial tensile strain is applied, the band gap value increases with strain value increasing. The maximum band gap value is obtained at about strain 4%. When compressive strain is applied, the band gap decreases with the increase of the electric field and transforms to metallic at about strain −3%. The present work provides an effective way to tune the electronic structure and band gap of the stanene/blue phosphorene bilayer.