Band-edge excitons in PbSe nanocrystals and nanorods

J. G. Tischler, T. A. Kennedy, E. R. Glaser, Al L. Efros, E. E. Foos, J. E. Boercker, T. J. Zega, R. M. Stroud, S. C. Erwin

Research output: Contribution to journalArticlepeer-review

29 Scopus citations

Abstract

We investigate the fine structure of band-edge excitons in PbSe nanocrystals and nanorods using circularly polarized magnetophotoluminescence and optically detected magnetic resonance and, based on the results, propose a singlet-triplet model of exciton photoluminescence from nondegenerate conduction and valence bands. From the data and model we extract g -factors for electrons and holes of +1.2 and +0.8, respectively. The splitting of the triplet ground state, which is responsible for the low-temperature photoluminescence, is 88μeV for nanorods, and less than 20μeV for nanocrystals. The intervalley splitting of the electron and hole levels in the nanocrystals is much larger than the electron-hole exchange interaction.

Original languageEnglish (US)
Article number245303
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume82
Issue number24
DOIs
StatePublished - 2010
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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