Reordering orbitals of semiconductor multi-shell quantum dot-quantum well heteronanocrystals
| Autor: | Ozan Yerli, Hilmi Volkan Demir, Mehmet Şahin, Sedat Nizamoglu |
|---|---|
| Přispěvatelé: | Demir, Hilmi Volkan |
| Jazyk: | angličtina |
| Rok vydání: | 2012 |
| Předmět: |
Electronic structure
Materials science CdSe/ZnS core/shell Core/shell nanocrystals Shell (structure) General Physics and Astronomy Electrons 02 engineering and technology Electron 01 natural sciences Zinc sulfide Emission Core/shell quantum dots Atomic orbital 0103 physical sciences Semiconductor quantum dots Shells (structures) Semiconductor quantum wells Heteronanocrystals Quantum well Monolayers 010302 applied physics Condensed matter physics business.industry Computational modeling Orbitals 021001 nanoscience & nanotechnology Cdse Semiconductor Nanocrystal Quantum dot Electrons and holes 0210 nano-technology business |
| Zdroj: | Journal of Applied Physics |
| Popis: | 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] |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|