Optical properties of exciton confinement in wurtzite ZnO/MgxZn1−xO coupled quantum dots |
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Authors: | Xu Zhao Shu-yi Wei Cong-xin Xia Guo-hong Wei |
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Institution: | College of Physics and Information Engineer, Henan Normal University, Xinxiang 453007, China |
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Abstract: | Based on the framework of effective-mass approximation and variational approach, optical properties of exciton are investigated theoretically in ZnO/MgxZn1−xO vertically coupled quantum dots (QDs), with considering the three-dimensional confinement of electron and hole pair and the strong built-in electric field effects due to the piezoelectricity and spontaneous polarization. The exciton binding energy, the emission wavelength and the oscillator strength as functions of the different structural parameters (the dot height and the barrier thickness between the coupled wurtzite ZnO QDs) are calculated with the built-in electric field in detail. The results elucidate that structural parameters have a significant influence on the exciton state and optical properties of ZnO coupled QDs. These results show the optical and electronic properties of the quantum dot that can be controlled and also tuned through the nanoparticle size variation. |
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Keywords: | ZnO coupled quantum dots Exciton states Emission wavelength Oscillator strength |
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