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

doi:10.1063/1.1989444

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

^*此作品的通信作者

物理學系

研究成果: 雜誌貢獻 › 期刊論文 › 同行評審

60 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
卷	87
發行號	2
DOIs	https://doi.org/10.1063/1.1989444
出版狀態	已發佈 - 2005 7月 11

ASJC Scopus subject areas

物理與天文學（雜項）

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abstract = "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.",

author = "Sun, {Chi Kuang} and Sun, {Shih Ze} and Lin, {Kung Hsuan} and Zhang, {Kenneth Yi Jie} and Liu, {Hsiang Lin} and Liu, {Sai Chang} and Wu, {Jih Jen}",

note = "Funding Information: This work was sponsored by the National Science Council of Taiwan, R.O.C. under Grant No. 93-2120-M-002-004. ",

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AU - Liu, Hsiang Lin

AU - Liu, Sai Chang

AU - Wu, Jih Jen

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N2 - 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.

AB - 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.

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Ultrafast carrier dynamics in ZnO nanorods

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