|
Structural and optical manipulation of quaternary-alloyed ZnxHg1-xSeyS1-y nanocrystals based on atomistic tight-binding theory |
|---|---|
| รหัสดีโอไอ | |
| Creator | Worasak Sukkabot |
| Title | Structural and optical manipulation of quaternary-alloyed ZnxHg1-xSeyS1-y nanocrystals based on atomistic tight-binding theory |
| Contributor | Waritsara Thajitr |
| Publisher | Faculty of Science, Ubon Ratchathani University |
| Publication Year | 2565 |
| Journal Title | Journal of Science and Science Education |
| Journal Vol. | 5 |
| Journal No. | 1 |
| Page no. | 72-84 |
| Keyword | Tight-binding theory, ZnxHg1-xSeyS1-y, fine structure splitting, band gap, nanocrystals |
| URL Website | https://so04.tci-thaijo.org/index.php/JSSE |
| Website title | https://so04.tci-thaijo.org/index.php/JSSE/article/view/255229/174504 |
| ISSN | ISSN 2697-410X |
| Abstract | The fundamental electronic and optical properties of ZnxHg1-xSeyS1-y quaternary-alloyed nanocrystals with structural parameters from experimental results are investigated by a virtual crystal approximation (VCA), an atomistic tight-binding description (TB) and configuration interaction approach (CI). With the reducing x and y contents, the optical band gaps are decreased because of the low HgS band gap promoted in ZnxHg1-xSeyS1-y quaternary-alloyed nanocrystals. Numerical and experimental optical band gaps appear to agree quantitatively and qualitatively. The optical efficiency is pronounced with the declining elemental compositions (x and y) and increasing diameters. The splittings of excitons are inversely comparative to the diameters, whereas those are directly relational to the alloy compositions as explained by the results of the exchange interaction between electron and hole. On the Hg- and S-rich side, the exciton fine structure splitting is reduced, thus being a good candidate for efficient generation of entangled photon pair. The stokes shift is enhanced in the Zn- and Se-rich side, introducing the excellent pathway for the optical filters. This work confirms that ZnxHg1-xSeyS1-y quaternary-alloyed nanocrystals are very interesting systems, not only for fundamental studies but also for future applications of quantum technology. |
