Ultrafast carrier dynamics in ZnO nanorods

Chi Kuang Sun, Shih Ze Sun, Kung Hsuan Lin, Kenneth Yi Jie Zhang, Hsiang Lin Liu, Sai Chang Liu, Jih Jen Wu

研究成果: 雜誌貢獻文章

58 引文 斯高帕斯(Scopus)

摘要

Free exciton and above-band-gap free carrier dynamics in ZnO nanorods have been investigated at room temperature with a femtosecond transient transmission measurement. Following the photoexcitation of above-band-gap free carriers, an extremely fast external thermalization time on the order of 200 fs can be observed. Under high excitation, hot phonon effects were found to delay the carrier cooling process. While the photoexcitation energy was tuned to match the free exciton transition, stable exciton formation can be uncovered while no evident exciton ionization process can be found unless the photoexcited exciton density exceeded the Mott density.

原文英語
文章編號023106
期刊Applied Physics Letters
87
發行號2
DOIs
出版狀態已發佈 - 2005 七月 11

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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    Sun, C. K., Sun, S. Z., Lin, K. H., Zhang, K. Y. J., Liu, H. L., Liu, S. C., & Wu, J. J. (2005). Ultrafast carrier dynamics in ZnO nanorods. Applied Physics Letters, 87(2), [023106]. https://doi.org/10.1063/1.1989444