dc.citation.conferencePlace |
KO |
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dc.citation.title |
5th International Conference on Ultrafast Structural Dynamics |
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dc.contributor.author |
Park, Won-Woo |
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dc.contributor.author |
Choi, Ji Yong |
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dc.contributor.author |
Song, Hyunjoon |
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dc.contributor.author |
Kwon, Oh Hoon |
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dc.date.accessioned |
2024-02-01T00:07:41Z |
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dc.date.available |
2024-02-01T00:07:41Z |
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dc.date.created |
2019-12-21 |
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dc.date.issued |
2019-06-26 |
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dc.description.abstract |
The carrier dynamics in semiconductor nanomaterials, CdSe nanorods of different length, was systematically studied. As a result, the understanding of the exciton relaxation pathway was extended to unveiling the CdSe nanorods electron-transfer mechanism in semiconductor-metal hybrid nanomaterial. We explored photo-generated exciton dynamics of the CdSe nanorods using time-resolved absorption and photoluminescence (PL) spectroscopy spanning sub-ps to μs time domain. We controlled the fluence and wavelength of photoexcitation and the length of nanorods. The combined time-resolved spectroscopic study revealed the fast Auger recombination [1] and the shallow-trap [2] and band-edge relaxations in the bare-rod system. For the semiconductor-metal hybrid systems, the majority of bleach recovery was found to follow ultrafast (<300 fs) channels. Additionally, minor slow bleach components were also observed in μs time scale. With the correlated time-resolved electronic spectroscopic methods covering a wide time window and broadband sensitive to dark and luminescent states, we complete the carrier-relaxation mechanism of the CdSe nanorod and the CdSe-metal hybrid systems. From the comparison of the photocatalytic activities [3] of the semiconductor-metal hybrid nanostructures, it is revealed that the minor electron-transfer channels via metal trap sites (10`s of μs relaxation components) are key to the photocatalytic activities. |
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dc.identifier.bibliographicCitation |
5th International Conference on Ultrafast Structural Dynamics |
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dc.identifier.uri |
https://scholarworks.unist.ac.kr/handle/201301/79588 |
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dc.language |
영어 |
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dc.publisher |
IBS, KAIST |
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dc.title |
Carrier relaxation pathway of semiconductor nanomaterial and semiconductor-metal hybrid nanomaterial |
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dc.type |
Conference Paper |
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dc.date.conferenceDate |
2019-06-25 |
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