Excitonic effects in optical absorption spectrum of CdS/ZnSe core-shell Nanostructures.

POSTER

Abstract

We have used a first principles, TDDFT method to study CdS (Type I) nanocrystal quantum dots and CdS/ZnSe core/shell (Type II) heteronanostructures with high accuracy. We have studied the existence of excitons and multi-excitons and the possibility of optical gain in these nanoclusters. The size dependence of the HOMO-LUMO gap, electron-hole wave function overlap in the relevant states, coordination of atoms at the surface as well as the stability of such clusters will be presented in some detail.

Authors

  • Kalum Palandage

    • University of Connecticut
    • Department of Physics, University of Connecticut

  • Gayanath Fernando

    • University of Connecticut
    • Department of Physics, University of Connecticut

  • Ramamurthy Ramprasad

    • University of Connecticut

  • Jim Davenport

    • Brookhaven National Lab
    • Computational Science Center, Brookhaven National
    • Computational Science Center, Brookhaven National Laboratory