Permanent dipole moment and charges in colloidal semiconductor quantum dots

Moonsub Shim, Philippe Guyot-Sionnest

Research output: Contribution to journalArticlepeer-review

Abstract

The presence of a large permanent dipole moment has important implications on our understanding of nanocrystalline materials. We report the results of dielectric dispersion studies of CdSe, ZnSe, and metal nanocrystals. Due to the polar nature of the wurtzite lattice, a permanent dipole moment may be expected for CdSe nanocrystals. However, dielectric dispersion studies reveal a similar magnitude of the dipole moment, as well as its dependence on size, in zinc-blende ZnSe nanocrystals. These dipole moments may be intrinsic attributes to all nonmetal nanoparticles with surface localized charges. We show evidence for thermally induced charging of both semiconductor and metal nanocrystals and present a simple picture to describe the linear dependence of dipole moment on the size in semiconductor nanocrystals.

Original languageEnglish (US)
Pages (from-to)6955-6964
Number of pages10
JournalJournal of Chemical Physics
Volume111
Issue number15
DOIs
StatePublished - Oct 15 1999
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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