Proceedings of nanoGe Fall Meeting19 (NFM19)
Publication date: 18th July 2019
Colloidal semiconductor nanoplatelets are excellent nano-emitters under current study. Core-shell and core-crown heterostructured platelets, with a CdSe core surrounded by CdS or ZnS have been synthesized with the purpose of passivating the surface to increase optical quantum efficiency and/or modulating the emission wavelength and recombination rate through band offset engineering.
The role of lattice mismatch strain, which has proved to be important in spherical and rod-shaped heteronanocrystals,[1-3] has been largely overlooked in quasi-2D nanoplatelets. In this work we go report a theoretical study on how the deformation potential associated with strain affects the conduction and valence band profiles in such systems. We consider not only binary core/shell -one material covering the top and the bottom facets of core- but also ternary core/shell/shell structures -with two different materials covering the top and the bottom facets of core-.
Using an effective mass model which accounts for electron-hole correlation in dielectrically mismatched platelets,[4] we quantify the influence of strain over the emission wavelength and wave function localization for different materials.
We show compressive strain in the core blueshifts the electron energy but redshifts that of the hole. As a result, the exciton energy is only weakly affected, which explains the success of models based on tunneling and dielectric effects to explain experimental observations.[5,6] We further show that in ternary CdSe/CdS/ZnS systems, the outer ZnS shell has the capability of blueshfiting the energy, partially compensating for the redshift tunneling imposes upon CdS growth.
The results are compared with experiments in the literature, where the role of strain has been invoked but not demonstrated[7].
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