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Real time (a, c) exciton transmission minimum (∼508 nm) and (b, d) PL peak (∼517 nm) intensities during intercalation of organic moiety CHI in PbI2 films. Rows a, b and c, d are for various PbI2 thicknesses (CHI concentration: 3 mM) and for various nonpolar solvents (PbI2 thickness: ∼100 nm), respectively. (Polar solvents propanol (PrOH) and methanol (MeOH) are also shown for comparison.)
