Band-Edge Excitons in PbSe Nanocrystals and Nanorods

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 88 eV for nanorods, and less than 20 eV for nanocrystals. The intervalley splitting of the electron and hole levels in the nanocrystals is much larger than the electron-hole exchange interaction.

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Document Details

Document Type
Technical Report
Publication Date
Dec 06, 2010
Accession Number
ADA534725

Entities

People

  • A. L. Efros
  • Edward E. Foos
  • Evan R. Glaser
  • J. E. Boercker
  • J. G. Tischler
  • Rhonda Stroud
  • S. C. Erwin
  • T. A. Kennedy
  • T. J. Zega

Organizations

  • United States Naval Research Laboratory

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Crystal Structure
  • Diameters
  • Electron Holes
  • Energy Bands
  • Ground State
  • High Temperature
  • Low Temperature
  • Magnetic Fields
  • Magnetic Resonance
  • Nanocrystals
  • Optical Properties
  • Optoelectronic Devices
  • Polarization
  • Semiconductors
  • Solid State Physics
  • Spectra
  • Spectroscopy

Fields of Study

  • Physics

Readers

  • Materials Science and Engineering.
  • Quantum Dot Semiconductor Device Photonics and Graphene Optoelectronic Materials and THz Physics.

Technology Areas

  • Microelectronics