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제126회 대한화학회 학술발표회 및 총회 Photocarrier relaxation pathways and multi-exciton relaxation of CdSe nanorods

등록일
2020년 9월 10일 16시 44분 42초
접수번호
1025
발표코드
PHYS.P-234 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
발표시간
10월 21일(수) 17:30~18:00
발표형식
포스터
발표분야
Physical Chemistry
저자 및
공동저자
Wonwoo Park, Hyunjoon Song1, Oh-Hoon Kwon*
Department of Chemistry, Ulsan National Institute of Science and Technology, Korea
1Department of Chemistry, Korea Advanced Institute of Science and Technology, Korea
With the advances in the topology study of the semiconductor nanocrystal, various designs of semiconductor nano-heterostructures, from organic molecules to metal hybrid structures and from 0D (nanodot) to 2D structures (nanosheet), have been extensively investigated for the future photovoltaics, biosensing, and energy harvesting materials.[1,2] For high catalytic and light-harvesting performance, the carrier dynamics of semiconductor nanostructures needs to be fully understood. Here, we systematically studied the photocarrier pathway of CdSe nanorods with the time-resolved absorption and emission spectroscopy spanning a wide time window (100’s of fs to sub-μs). With the control of fluence and the wavelength of the excitation and the length of the nanorods, the combined time-resolved spectroscopic study deciphered that ultrafast intra-band relaxation (<500 fs), fast Auger recombination[3], carrier-trap assisted recombination[4], and band-edge relaxation. Fluence-dependent time-resolved emission spectra (TRES) revealed the binding energy and the lifetime of multi excitons. [1] K. Sawaguchi-Sato, A. Kobayashi, M. Yoshida, M. Kato, J. Photoch. Photobio. A 335, 182-189 (2017). [2] K. Wu, Q. Li, Y. Du, Z. Chen, T. Lian, Chem. Sci. 6, 1049-1054 (2015). [3] V. I. Klimov, A. A. Mikhailovsky, D. W. McBranch, C. A. Leatherdale, and M. G. Bawendi, Science 287, 5455 (2000). [4] K. E. Knowles, E. A. McArthur, and E. A. Weiss, ACS Nano 5, 2026-2035 (2011).

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