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Effect of air exposure on the PL lifetime of MAPbI3 thin films. (a) Time-resolved PL kinetics at 766 nm before and after 2 min exposure to air (RH 58%, 19.2 °C) under excitation of a 400 nm pulsed laser beam (fluence 2.3 μJ/cm2). (b) PL spectra before and after 2 min exposure to air (RH 58%, 19.2 °C). (c) PL lifetime as a function of time for samples exposed to air (RH 58%, 19.2 °C). (d) PL lifetime as a function of time for samples under an air-free environment (vacuum).
