Comparison of the yield-mobility product from TRMC and amplitude-weighted average carrier lifetime of (NH ). Taking the maximum yield-mobility product at the lowest light fluences (e.g., the minimum limit for the true mobility) in combination with the dark microwave conductivity, we extract an estimate for the maximum equilibrium carrier densities: 7.9 × 10 15 cm -3 for Cs 2 SnI 6 , and 9.0 × 10 17 cm -3 for (CH 3 NH 3 ) 2 SnI 6 .