Lattice constants for the in cubic phase in Angstrom: CsPbI3 6.1769 CsPbBr3 5.874 CsPbCl3 5.605 CsSnI3 6.219 CsSnBr3 5.80 CsSnCl3 5.56 CsGeI3 6.05 CsGeBr3 5.69 CsGeCl3 5.47