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Ultrafast exciton dynamics. Pump–probe spectra at 10 ps time delay (610 nm excitation and 2.63 nJ/pulse) of (a) LPE 10–30k g WS2/H2O and LPE 10–30k g WS2/IPA samples and (b) ME untreated and Li-TFSI treated WS2 monolayer samples. (c) Normalized kinetics taken at the AML-exciton (monolayer) GSB and AFL-exciton (few-layer) GSB. Data are well fitted by a three-exponential function (solid lines).
