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Solution-processable two-dimensional (2D) semiconductors with chemicallytunable thickness and associated tunable band gaps are highly promisingmaterials for ultrathin optoelectronics. Here, the properties of free chargecarriers and excitons in 2D PbS nanosheets of different thickness areinvestigated by means of optical pump-terahertz probe spectroscopy. Byanalyzing the frequency-dependent THz response, a large quantum yield ofexcitons is found. The scattering time of free charge carriers increases withnanosheet thickness, which is ascribed to reduced effects of surface defectsand ligands in thicker nanosheets. The data discussed provide values for the DCmobility in the range 550 - 1000 cm2/Vs for PbS nanosheets with thicknessesranging from 4 to 16 nm. Results underpin the suitability of colloidal 2D PbSnanosheets for optoelectronic applications.

Photoexcitation of PbS Nanosheets Leads to Highly Mobile Charge Carriers and Stable Excitons