61, ϵ ′′ r = 0.0720, with a cavity sensitivity factor, K = -4820.34 S -1 at 9.72 GHz, as described in the Methods. The time-resolved microwave conductivity (TRMC) transients reveal the photogeneration of mobile carriers using 355 and 600 nm excitations, as illustrated by the transients for different excitation fluences in Figure and Figure . Excitation with a 355 nm source, chosen to match the PL excitation spectrum, also revealed photogeneration of carriers; however, the yield-mobility product and lifetimes are significantly lower than excitation at 600 nm (Figure ). Using the mobility and conductivity obtained from the "dark" and time-resolved microwave conductivity measurements, the carrier density of 5.89 × 10 16 cm -3 is computed via σ = enµ, and the assumption that the photogenerated carrier yield is unity (Φ = 1). Transients are fit using bi-exponential functions convoluted with the 7 ns cavity response; the transients could not be fit with a single exponential decay. A summary of the fluence-dependent yield-mobility product and amplitude-weighted lifetime are presented in Figure , and it is possible to see the presence of a high-amplitude fast decay (nearly response limited) along with a slower decay that is more visible at lower light fluences.