Novel 2D ferroelastic SnNX (X = Cl, Br) monolayers with anisotropic high carrier mobility and excellent thermoelectric transport properties

At 700 K, the optimal ZT of SnNCl and SnNBr monolayers reached 2.55 and 3.23, respectively. Higher ZT values and good ferroelasticity indicate that SnNX (X = Cl, Br) monolayers should be promising thermoelectric and ferroelastic materials.