Reordering orbitals of semiconductor multi-shell quantum dot-quantum well heteronanocrystals
Demir, H. V.
Journal of Applied Physics
American Institute of Physics
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Şahin, M., Nizamoglu, S., Yerli, O., & Demir, H. V. (2012). Reordering orbitals of semiconductor multi-shell quantum dot-quantum well heteronanocrystals. Journal of Applied Physics, 111(2), 023713.
Please cite this item using this persistent URLhttp://hdl.handle.net/11693/12233
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]