Figure 2: Charge carrier decay kinetics.

Transient bleach traces (dots) for 5.9 nm thick PbS nanosheets excited at 800 nm at various pump fluences and probed at a photon energy for which the transient bleach is maximum. The pump fluences used yield e–h pair densities from 3.7 × 10¹⁷cm⁻³ up to 1.8 × 10¹⁹cm⁻³. Lines represent a global fit of the model with second-order Auger recombination, as discussed in the text.