Proceedings of nanoGe Fall Meeting 2018 (NFM18)
DOI: https://doi.org/10.29363/nanoge.nfm.2018.139
Publication date: 6th July 2018
Colloidal cadmium chalcogenide nanoplatelets are two-dimensional nanomaterials having an atomically flat surface, and their thickness is quantized to an integer number of monolayers resulting in an extremely narrow absorption and photoluminescence.1 It is well established that their properties can be modified by altering their thickness as well as lateral dimensions owing change in confinement of excitons. The properties depend on the surface. Here we have investigated the effect of shell thickness as well as of the surface terminating layer – anionic and cationic – on the optical properties in core/shell nanoplatelets. We have synthesized CdSe/CdS which is a quasi-type-II system and CdSe/ZnS, a type-I heterostructured core/shell nanoplatelets (NPL) and studied their optical properties as a function of shell thickness and nature of surface terminating layer. The results reveal that no matter which cation is on the surface – Zn or Cd – the PL is always high compared to the surface being anion terminated. An alternating behaviour in the PL intensity, PL lifetimes, and the emission peak widths is observed upon successively terminating the surface with cations and anions. All these observations are correlated to the density and nature of surface traps that are created on the surface depending upon cation or anion termination.2
(1) Ithurria, S.; Tessier, M. D.; Mahler, B.; Lobo, R. P. S. M.; Dubertret, B.; Efros, A. L. Colloidal Nanoplatelets with Two-Dimensional Electronic Structure. Nat. Mater. 2011, 10 (12), 936–941.
(2) Yadav, S.; Singh, A.; Thulasidharan, L.; Sapra, S. Surface Decides the Photoluminescence of Colloidal CdSe Nanoplatelets Based Core/Shell Heterostructures. J. Phys. Chem. C 2018, 122 (1), 820–829.
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