Surface plasmon induced exciton redistribution in ZnCdO/ZnO coaxial multiquantum-well nanowires

Liu, B.; Cheng, C. W.; Chen, R.; Ekahana, S. A.; Yang, W. F.; Wang, S. J.; Sum, T. C.; Shen, Z. X.; Fan, H. J.; Sun, H. D.
August 2010
Applied Physics Letters;8/23/2010, Vol. 97 Issue 8, p081107
Academic Journal
The authors present the surface plasmon effects of Au nanoparticles on the photoluminescence properties of ZnCdO/ZnO coaxial multiquantum-well nanowires fabricated using chemical vapor deposition and pulse laser deposition methods. The spontaneous emission rate from ZnCdO quantum wells was increased by surface plasmon coupling by 1.29 times. The strong plasmon coupling between ZnO barriers and Au nanoparticles provides an extra fast decay channel for excitons generated in ZnO barrier layer and leads to exciton redistribution in ZnCdO/ZnO coaxial quantum wells, which promotes radiative recombination in ZnO barriers but reduces the number of excitons relaxing into the ZnCdO quantum wells.


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