Polarization Electric Field in 2D Polar Monolayer Silicon Monochalcogenides SiX (X = S, Se) as Potential Photocatalysts for Water Splitting

Strain-induced ferroelectric polarization reversal without undergoing geometric inversion in blue SiSe monolayer

“…The lattice constant of buckled SiSe is 3.52 Å. 26 Under biaxial strain, the total energy of the monolayer increases, no matter if the strain is compressive or tensile, see Fig. 2 (D a 0 biaxial).…”

“…The blue phase of the SiSe monolayer has been found to be a new type of group IV-VI semiconductor. [24][25][26] The configuration is non-centrosymmetric and presents an out-of-plane polarization. Due to the large buckling, the polarization reversal is difficult to achieve through the electric field.…”