Tight-binding calculations of image-charge effects in colloidal nanoscale platelets of CdSe

R. Benchamekh, N. A. Gippius, J. Even, M. O. Nestoklon, J. M. Jancu, S. Ithurria, B. Dubertret, Al L. Efros, P. Voisin

Research output: Contribution to journalArticlepeer-review

134 Citations (Scopus)

Abstract

CdSe nanoplatelets show perfectly quantized thicknesses of a few monolayers. They present a situation of extreme, yet well defined quantum confinement. Due to a large dielectric contrast between the semiconductor and its ligand environment, interaction between carriers and their dielectric images strongly renormalize bare single particle states. We discuss the electronic properties of this original system in an advanced tight-binding model, and show that Coulomb interactions, including self-energy corrections and enhanced electron-hole interaction, lead to exciton binding energies up to several hundred meV.

Original languageEnglish
Article number035307
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume89
Issue number3
DOIs
Publication statusPublished - 13 Jan 2014
Externally publishedYes

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