Proceedings of MATSUS Fall 2023 Conference (MATSUSFall23)
DOI: https://doi.org/10.29363/nanoge.matsus.2023.365
Publication date: 18th July 2023
Semiconductor colloidal nanoplatelets are quasi-2D nanocrystals, which are often considered to be the
wet chemistry analogous of epitaxial quantum wells. They show however a few distinct features that lead to
characteristic properties: (i) the presence of weak, but finite lateral confinement; (ii) the presence of strong
dielectric confinement posed by organic ligands surrounding the inorganic platelets; (iii) the possibility of
building radial heterostructures.
In this presentation we give an overview on our group’s attempts to provide insight into the photophysics
of these systems using effective mass Hamiltonians. The electronic structure of CdSe-based nanoplatelets
(homo and heterostructures) is reported for excitons, charged excitons and biexcitons. It is found that
Coulomb interactions, boosted by dielectric confinement, play a prominent role in determining the physical
response of these systems.[1-5]
Excitons in metal halide perovskite platelets are also investigated. Here, the soft lattice leads to a sizable
polaron radius (~1 nm), which we incorporate to our model by means of Haken's potential. We find that
dielectric screening is weakened in quasi-2D structures because the exciton radius becomes comparable
to the polaron one. The resulting exciton binding energies and self-energy potentials agree well with
experiments and atomistic calculations for layered perovskites.[6]
REFERENCES:
[1] F. Rajadell et al. Phys. Rev. B 2017, 96, 035307.
[2] D. Macias-Pinilla et al. J. Phys. Chem. C 2021, 125, 15614.
[3] J. Llusar et al. J. Phys. Chem. C 2022, 126, 7152.
[4] J. Llusar et al. Phys. Rev. Lett. 2022, 129, 066404.
[5] D. Macias-Pinilla et al. Nanoscale 2022, 14, 8493.
[6] J.L. Movilla et al. Nanoscale Adv. 2023, DOI: 10.1039/D3NA00592E.
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