Fluorinated and brominated chemistry could be expected to work, given the Si−F (576 kJ/mol or 5.97 eV) and Si−Br (358 kJ/mol or 3.71 eV) bond strengths, whereas the Si−I bond (234 kJ/mol or 2.52 eV) that has lower bond strength than the Si−Si bond would be expected to be less efficient.