Determination of the In-Plane Exciton Radius in 2D CdSe Nanoplatelets via Magneto-optical Spectroscopy

Alexandra Brumberg, Samantha M. Harvey, John P. Philbin, Benjamin T. Diroll, Byeongdu Lee, Scott A. Crooker, Michael R Wasielewski, Eran Rabani, Richard Daniel Schaller*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

35 Scopus citations


Colloidal, two-dimensional semiconductor nanoplatelets (NPLs) exhibit quantum confinement in only one dimension, which results in an electronic structure that is significantly altered compared to that of other quantum-confined nanomaterials. Whereas it is often assumed that the lack of quantum confinement in the lateral plane yields a spatially extended exciton, reduced dielectric screening potentially challenges this picture. Here, we implement absorption spectroscopy in pulsed magnetic fields up to 60 T for three different CdSe NPL thicknesses and lateral areas. Based on diamagnetic shifts, we find that the exciton lateral extent is comparable to NPL thickness, indicating that the quantum confinement and reduced screening concomitant with few-monolayer thickness strongly reduces the exciton lateral extent. Atomistic electronic structure calculations of the exciton size for varying lengths, widths, and thicknesses support the substantially smaller in-plane exciton extent.

Original languageEnglish (US)
Pages (from-to)8589-8596
Number of pages8
JournalACS nano
Issue number8
StatePublished - Aug 27 2019


  • Diamagnetic shift
  • electronic structure
  • exciton size
  • nanoplatelets
  • quantum confinement

ASJC Scopus subject areas

  • General Materials Science
  • General Engineering
  • General Physics and Astronomy


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