Journal article
Determination of the In-Plane Exciton Radius in 2D CdSe Nanoplatelets via Magneto-optical Spectroscopy
ACS nano, v 13(8), pp 8589-8596
27 Aug 2019
PMID: 31251582
Abstract
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.
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Details
- Title
- Determination of the In-Plane Exciton Radius in 2D CdSe Nanoplatelets via Magneto-optical Spectroscopy
- Creators
- Alexandra Brumberg - Northwestern UniversitySamantha M. Harvey - Northwestern UniversityJohn P. Philbin - University of California, BerkeleyBenjamin T. Diroll - Argonne National LaboratoryByeongdu Lee - Argonne National LaboratoryScott A. Crooker - Los Alamos National LaboratoryMichael R. Wasielewski - Northwestern UniversityEran Rabani - University of California, BerkeleyRichard D. Schaller - Northwestern UniversityLos Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Publication Details
- ACS nano, v 13(8), pp 8589-8596
- Publisher
- Amer Chemical Soc
- Number of pages
- 8
- Grant note
- DMREF-1629383; DMREF-1629361; DGE-1324585; DMR-1157490; 1644779 / National Science Foundation; National Science Foundation (NSF) State of Florida U.S. Department of Energy; United States Department of Energy (DOE) DE-FG02-99ER14999; DE-AC02-06CH11357 / U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences; United States Department of Energy (DOE)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Chemistry
- Web of Science ID
- WOS:000484077800010
- Scopus ID
- 2-s2.0-85070527196
- Other Identifier
- 991022053794404721
InCites Highlights
Data related to this publication, from InCites Benchmarking & Analytics tool:
- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Chemistry, Multidisciplinary
- Chemistry, Physical
- Materials Science, Multidisciplinary
- Nanoscience & Nanotechnology