Proceedings of nanoGe Fall Meeting 2018 (NFM18)
DOI: https://doi.org/10.29363/nanoge.nfm.2018.170
Publication date: 6th July 2018
Two-dimensional metal chalcogenide (CdSe, PbSe, PbS) materials were synthesized by processing from solution. Typical thicknesses range from one to more than ten nanometers. We studied the photogeneration, mobility and decay dynamics of charge carriers and excitons in: 1) CdSe nanosheets, 2) superlattices of connected PbSe QDs with square or honeycomb geometry, and 3) PbS nanosheets. The studies were performed using ultrafast pump-probe laser spectroscopy with optical or terahertz conductivity detection.
The composition and nanogeometry of the material were found to have pronounced effects on the relative yield of free mobile charges and neutral excitons. The relative yield of excitons was found to increase with excitation density. This effect could be described on the basis of the Saha equation, which accounts for more charge recombination at higher photoexcitation density.
The mobility of charge carriers depends strongly on the nanogeometry and material composition. In PbSe honeycomb superlattices mobilities are of the order of 1 cm2/Vs, while in square superlattices and PbS nanosheets values as high as a few hundred cm2/Vs were found. The frequency dependence of the mobility could be described theoretically by the Drude-Smith model, which includes effects of charge scattering on phonons as well as static defects.
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