Experimental methods, table of spin-coating methods, figures of accuracy of derivative fits and temperature and field dependence of EA, expected energy shift and energy broadening of a Wannier exciton, effect of a ferroelectric phase transition on the EA line shape, accuracy of derivative fits, figures of spectra and relative errors, derivative fit equation, calculation of perpendicular dipole moment, fitting Δμ and Δα to Bose− Einstein distribution functions, and figures of PL, TRPL, and XRD (PDF)■ AUTHOR INFORMATION