New manifold two-dimensional single-layer structures of zinc-blende compounds

Abstract

Two-dimensional (2D) materials open up tremendous opportunities for attractive applications in next-generation flexible and transparent nanoelectronic devices. In this work, the structural and electronic properties of 81 single layer structures are systematically examined for the 27 zinc-blende (ZB) materials with the constitutional formula MX by density functional calculations. The calculated results reveal that 38 of them are thermodynamically stable including 12 two-phase coexistence structures. Interestingly, the stable configurations in various MX compounds are correlated with the atomic radius and electronegativity difference of constituent elements X and M. The atomic and electronic properties of novel materials are greatly dependent on the stable phase structures. The stable single-layer ZB structures exhibit versatile electronic properties, such as tunable band gaps, strong optical absorption in the solar spectrum and suitable band edge positions, thus such 2D materials are potential photocatalysts for water-splitting.