Ultrafast carrier dynamics in ZnO nanorods | Zendy

ChiKuang Sun | Zendy; Shih-Ze Sun | Zendy; KungHsuan Lin | Zendy; Kenneth Yi-Jie Zhang | Zendy; HsiangLin Liu | Zendy; Sai-Chang Liu | Zendy; JihJen Wu | Zendy

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Ultrafast carrier dynamics in ZnO nanorods

Author(s) -

ChiKuang Sun,

Shih-Ze Sun,

KungHsuan Lin,

Kenneth Yi-Jie Zhang,

HsiangLin Liu,

Sai-Chang Liu,

JihJen Wu

Publication year - 2005

Publication title -

applied physics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.182

H-Index - 442

eISSN - 1077-3118

pISSN - 0003-6951

DOI - 10.1063/1.1989444

Subject(s) - photoexcitation , exciton , femtosecond , multiple exciton generation , materials science , band gap , thermalisation , biexciton , excitation , nanorod , ultrashort pulse , ionization , phonon , impact ionization , optoelectronics , condensed matter physics , atomic physics , molecular physics , chemistry , nanotechnology , excited state , laser , physics , optics , ion , organic chemistry , quantum mechanics

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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