Nano-engineered electron-hole exchange interaction controls exciton dynamics in core-shell semiconductor nanocrystals

S. Brovelli, Richard D Schaller, S. A. Crooker, F. García-Santamaría, Y. Chen, R. Viswanatha, J. A. Hollingsworth, H. Htoon, Victor I Klimov

Research output: Contribution to journalArticle

166 Citations (Scopus)

Abstract

A strong electron-hole exchange interaction (EI) in semiconductor nanocrystals (NCs) gives rise to a large (up to tens of meV) splitting between optically active ('bright') and optically passive ('dark') excitons. This dark-bright splitting has a significant effect on the optical properties of band-edge excitons and leads to a pronounced temperature and magnetic field dependence of radiative decay. Here we demonstrate a nanoengineering-based approach that provides control over EI while maintaining nearly constant emission energy. We show that the dark-bright splitting can be widely tuned by controlling the electron-hole spatial overlap in core-shell CdSe/CdS NCs with a variable shell width. In thick-shell samples, the EI energy reduces to

Original languageEnglish
Article number280
JournalNature Communications
Volume2
Issue number1
DOIs
Publication statusPublished - 2011

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Quantum Dots
Exchange interactions
Nanocrystals
nanocrystals
excitons
Electrons
Semiconductor materials
Magnetic Fields
Nanoparticles
interactions
Temperature
Temperature distribution
temperature distribution
Optical properties
Magnetic fields
optical properties
energy
decay
magnetic fields
LDS 751

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Chemistry(all)
  • Physics and Astronomy(all)

Cite this

Nano-engineered electron-hole exchange interaction controls exciton dynamics in core-shell semiconductor nanocrystals. / Brovelli, S.; Schaller, Richard D; Crooker, S. A.; García-Santamaría, F.; Chen, Y.; Viswanatha, R.; Hollingsworth, J. A.; Htoon, H.; Klimov, Victor I.

In: Nature Communications, Vol. 2, No. 1, 280, 2011.

Research output: Contribution to journalArticle

Brovelli, S, Schaller, RD, Crooker, SA, García-Santamaría, F, Chen, Y, Viswanatha, R, Hollingsworth, JA, Htoon, H & Klimov, VI 2011, 'Nano-engineered electron-hole exchange interaction controls exciton dynamics in core-shell semiconductor nanocrystals', Nature Communications, vol. 2, no. 1, 280. https://doi.org/10.1038/ncomms1281
Brovelli, S. ; Schaller, Richard D ; Crooker, S. A. ; García-Santamaría, F. ; Chen, Y. ; Viswanatha, R. ; Hollingsworth, J. A. ; Htoon, H. ; Klimov, Victor I. / Nano-engineered electron-hole exchange interaction controls exciton dynamics in core-shell semiconductor nanocrystals. In: Nature Communications. 2011 ; Vol. 2, No. 1.
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