Figure 4
Thickness dependence of LUMO lifetime.
(a) Intensity of LUMO against Δt for 1, 2, 3, and 5 ML C60. Decay times are fitted using eq. (1) for 1–3 ML, while that for 5 ML is estimated by a slope at Δt > 1 ps (dotted lines). (b) Simulated results with the interlayer hopping model for 2 ML (blue line), 3 ML (pink line), and 5 ML (black line). τd obtained in a are also shown as exp (−t/τd) (dotted lines) to compare with the simulation (solid lines).
