Reordering orbitals of semiconductor multi-shell quantum dot-quantum well heteronanocrystals


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Sahin M. , Nizamoglu S., Yerli O., Demir H. V.

JOURNAL OF APPLIED PHYSICS, vol.111, no.2, 2012 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 111 Issue: 2
  • Publication Date: 2012
  • Doi Number: 10.1063/1.3678585
  • Title of Journal : JOURNAL OF APPLIED PHYSICS

Abstract

Based on self-consistent computational modeling of quantum dot-quantum well (QDQW) heteronanocrystals, we propose and demonstrate that conduction-electron and valence-hole orbitals can be reordered by controlling shell thicknesses, unlike widely known core/shell quantum dots (QDs). Multi-shell nanocrystals of CdSe/ZnS/CdSe, which exhibit an electronic structure of 1s-1p-2s-2p-1d-1f for electrons and 1s-1p-2s-2p-1d-2d for holes using thin ZnS and CdSe shells (each with two monolayers), lead to 1s-2s-1p-1d-1f-2p electron-orbitals and 1s-2s-1p-1d-2p-1f hole orbitals upon increasing the shell thicknesses while keeping the same core. This is characteristically different from the only CdSe core and CdSe/ZnS core/shell QDs, both exhibiting only 1s-1p-1d-2s-1f-2p ordering for electrons and holes. (C) 2012 American Institute of Physics. [doi: 10.1063/1.3678585]