Magneto-optical properties of CuInS2 nanocrystals

William D. Rice, Hunter McDaniel, Victor I Klimov, Scott A. Crooker

Research output: Contribution to journalArticle

43 Citations (Scopus)

Abstract

We compare the absorption, photoluminescence, and magneto-optical properties of colloidal CuInS2 (CIS) nanocrystals with two closely related and well-understood binary analogs: Cu-doped ZnSe nanocrystals and CdSe nanocrystals. In contrast with conventional CdSe, both CIS and Cu-doped ZnSe nanocrystals exhibit a substantial energy separation between emission and absorption peaks (Stokes shift) and a marked asymmetry in the polarization-resolved low-temperature magneto-photoluminescence, both of which point to the role of localized dopant/defect states in the forbidden gap. Surprisingly, we find evidence in CIS nanocrystals of spin-exchange coupling between paramagnetic moments in the nanocrystal and the conduction/valence bands of the host lattice, a behavior also observed in Cu-doped ZnSe nanocrystals, where the copper atoms incorporate as paramagnetic Cu2+ ions.

Original languageEnglish
Pages (from-to)4105-4109
Number of pages5
JournalJournal of Physical Chemistry Letters
Volume5
Issue number23
DOIs
Publication statusPublished - Dec 4 2014

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Keywords

  • colloidal nanocrystals
  • CuInS
  • magnetic circular dichroism
  • magneto-photoluminescence
  • spin exchange

ASJC Scopus subject areas

  • Materials Science(all)

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