Fig. 4. Optical absorption spectra of hybrid samples for the (a) visible and (b) infrared color region, illustrating 2D-MoS₂ excitonic absorption features with the signature of the direct band edge transition and size dependent absorption features for 0D-PbS. (c) Time-resolved photoluminescence spectra of control MoS₂ and PbS/MoS₂ hybrids with the latter showing a higher carrier lifetime. Solid lines are fit to the experimental data using eqn (1).