Strain release in metastable CdSe/CdS quantum dots

Ke Gong, Gary Beane, David F. Kelley

Research output: Contribution to journalArticleResearchpeer-review

7 Citations (Scopus)

Abstract

It has recently been shown (J. Phys. Chem. Lett., 2015, 6, 1559) that high quantum yields (QYs) in zincblende CdSe/CdS quantum dots can be achieved when the lattice strain energy density is in the stable (0-0.59 eV/nm2) or metastable (0.59-0.85 eV/nm2) regime. Annealing of metastable particles causes a dramatic reduction in the observed QY and a red shift of the absorbance and photoluminescence. In this work we demonstrate that the decline in QY upon annealing is due to the formation of hole traps. These traps, while dramatically affecting the observed QY, produce no significant changes in either morphology or crystallinity as determined by high resolution transmission electron microscopy (HRTEM).

Original languageEnglish
Pages (from-to)18-23
Number of pages6
JournalChemical Physics
Volume471
DOIs
Publication statusPublished - 1 Jun 2016
Externally publishedYes

Keywords

  • Annealing
  • Core/shell interface
  • Photoluminescence
  • Quantum yield
  • Shell morphology

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