Ferroelectric engineering of two-dimensional group-IV monochalcogenides: The effects of alloying and strain

Abstract

• The stability and ferroelectricity of nine 2D group-IV monochalcogenides in two competing crystal structures have been studied. • It is found that these compounds can be divided into three groups according to their stability and ferroelectricity. • Pb-doping and equibiaxial strain are found to be effective in stabilizing the rippled phases to achieve ferroelectricity.