Jump to main content
Jump to site search


A strain-induced exciton transition energy shift in CdSe nanoplatelets: the impact of an organic ligand shell

Author affiliations

Abstract

We study the influence of surface passivating ligands on the optical and structural properties of zinc blende CdSe nanoplatelets. Ligand exchange of native oleic acid with aliphatic thiol or phosphonic acid on the surface of nanoplatelets results in a large shift of exciton transition energy for up to 240 meV. Ligand exchange also leads to structural changes (strain) in the nanoplatelet's core analysed by wide-angle X-ray diffraction. By correlating the experimental data with theoretical calculations we demonstrate that the exciton energy shift is mainly caused by the ligand-induced anisotropic transformation of the crystalline structure altering the well width of the CdSe core. Further the exciton reduced mass in these CdSe quantum wells is determined by a new method and this agrees well with the expected values substantiating that ligand-strain induced changes in the colloidal quantum well thickness are responsible for the observed spectral shifts. Our findings are important for theoretical modeling of other anisotropically strained systems and demonstrate an approach to tune the optical properties of 2D semiconductor nanocrystals over a broad region thus widening the range of possible applications of AIIBVI nanoplatelets in optics and optoelectronics.

Graphical abstract: A strain-induced exciton transition energy shift in CdSe nanoplatelets: the impact of an organic ligand shell

Back to tab navigation

Supplementary files

Publication details

The article was received on 12 Jul 2017, accepted on 24 Oct 2017 and first published on 25 Oct 2017


Article type: Paper
DOI: 10.1039/C7NR05065H
Citation: Nanoscale, 2017, Advance Article
  •   Request permissions

    A strain-induced exciton transition energy shift in CdSe nanoplatelets: the impact of an organic ligand shell

    A. Antanovich, A. W. Achtstein, A. Matsukovich, A. Prudnikau, P. Bhaskar, V. Gurin, M. Molinari and M. Artemyev, Nanoscale, 2017, Advance Article , DOI: 10.1039/C7NR05065H

Search articles by author

Spotlight

Advertisements