期刊
NANOSCALE
卷 11, 期 44, 页码 21569-21576出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9nr07927k
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- Netherlands Organization for Scientific Research (NWO) [715.016.002]
- European Research Council via the ERC Starting Grant 2D-SYNETRA (Seventh Framework Program FP7) [304980]
- German Research Foundation DFG [KL 1453/9-2]
- German Research Foundation DFG
- Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany's Excellence Strategy within the Cluster of Excellence PhoenixD (EXC 2122) [390833453]
Solution-processable two-dimensional (2D) semiconductors with chemically tunable thickness and associated tunable band gaps are highly promising materials for ultrathin optoelectronics. Here, the properties of free charge carriers and excitons in 2D PbS nanosheets of different thickness are investigated by means of optical pump-terahertz probe spectroscopy. By analyzing the frequency-dependent THz response, a large quantum yield of excitons is found. The scattering time of free charge carriers increases with nanosheet thickness, which is ascribed to reduced effects of surface defects and ligands in thicker nanosheets. The data discussed provide values for the DC mobility in the range 550-1000 cm(2) V-1 s(-1) for PbS nanosheets with thicknesses ranging from 4 to 16 nm. Results underpin the suitability of colloidal 2D PbS nanosheets for optoelectronic applications.
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