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Theoretical simulation of exciton and biexciton of ZnTe/ZnS type-I and ZnTe/ZnSe type-II core/shell nanocrystals |
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| รหัสดีโอไอ | |
| Creator | Worasak Sukkabot |
| Title | Theoretical simulation of exciton and biexciton of ZnTe/ZnS type-I and ZnTe/ZnSe type-II core/shell nanocrystals |
| Publisher | Maejo University |
| Publication Year | 2560 |
| Journal Title | Maejo International Journal of Science and Technology |
| Journal Vol. | 11 |
| Journal No. | 2 |
| Page no. | 164 |
| Keyword | tight-binding theory, exciton, biexciton, core/shell nanocrystal |
| Website title | Maejo International Journal of Science and Technology |
| ISSN | 1905-7873 |
| Abstract | In the present study the atomistic tight-binding theory and configuration interaction description are used to simulate the exciton and biexciton of ZnTe/ZnS type-I and ZnTe/ZnSe type-II core/shell nanocrystals. The control and tunability of the exciton and biexciton are properly engineered by the type of the band profiles and thickness of the growth shell. In particular, the exciton energies, biexciton energies, interacted coulomb integrals, exciton binding energies, biexciton binding energies, negative exciton binding energies and positive exciton binding energies are entirely sensitive to the type and dimension of the coated shells. The energies of the exciton and biexciton are reduced with the increasing growth shell thickness. In addition, the exciton and biexciton energies of ZnTe/ZnS type-I core/shell nanocrystals are greater than those of ZnTe/ZnSe type-II core/shell nanocrystals. This insight is important for a theoretical understanding and practical control by band alignments and sizes in the growth shells in order to assess the potential of particular core/shell nanocrystal structures for single exciton lasing application. |
