Figure 5: Ultrafast carrier-relaxation dynamics of the TMD composite films.
From: Flexible transition metal dichalcogenide nanosheets for band-selective photodetection
Two-dimensional plots of transient differential transmission ΔT/T0 spectra of the TMD/polymer film. Each plot represents the measurement result—(a) MoSe2 and (b) MoS2. (c) Time-resolved optical-pump and optical-probe data. Normalized ΔT dynamics are shown for polymer-exfoliated MoS2 nanosheets (red), bulk (black) and monolayer MoS2 (blue). Inset: ΔT dynamics plotted with a log scale on x-axis. (d) Transient dynamics measured by the optical-pump and THz-probe spectroscopy. Pump-induced field change (ΔE) of the bulk and polymer-exfoliated MoS2 are plotted as a function of the pump–probe delay. Both of the signals were fitted with a bi-exponential decay. Inset: transient THz dynamics plotted on the log scale to emphasize the slow decay dynamics of the exfoliated sample.
