Longitudinal-optical-phonon-assisted energy relaxation in self-assembled CdS quantum dots embedded in ZnSe

Kumano, H.; Yoshida, H.; Tawara, T. et al.

Journal of Applied Physics, 2002, 92(7), 3573-3578

Permalink : https://hdl.handle.net/2115/5536

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アクセス権
open access
URI
https://hdl.handle.net/2115/5536
タイトル
Longitudinal-optical-phonon-assisted energy relaxation in self-assembled CdS quantum dots embedded in ZnSe
著者
Kumano, H. ; Yoshida, H. ; Tawara, T. ; Suemune, I.
e-Rad_Researcher
70292042
著者名
Kumano, H.
熊野, 英和
著者名
Yoshida, H.
著者名
Tawara, T.
著者名
Suemune, I.
言語
英語
発行日
2002-10
出版者
American Institute of Physics
収録物名
Journal of Applied Physics
巻(号)
92(7)
ページ
3573-3578
抄録
The energy relaxation processes of CdS self-assembled quantum dots (QDs) embedded in ZnSe were investigated. Longitudinal-optical (LO)-phonon resonant structures were discerned in the photoluminescence spectra under the CdS selective excitation, especially under nearly resonant excitation conditions. Strong energy selectivity among the Gaussian distributed energy levels of the QDs are observed in energy relaxation processes, in which excitons are dominantly injected into the QDs whose ground state energies with respect to the excitation energy are equal to the multi-LO-phonon energy of ZnSe. Detection-energy dependent photoluminescence excitation (PLE) measurements also suggest that the coupling strength between the excitons and LO phonons is strongly size-dependent, i.e., coupling is strongly enhanced in smaller QDs. In addition, type-II band alignment of the CdS/ZnSe heterostructure is experimentally confirmed directly by PLE measurements.
資源タイプ
学術雑誌論文
出版タイプ
Version of Record
権利情報
Copyright © 2002 American Institute of Physics
PISSN
0021-8979
関連情報
URI
http://www.aip.org/
関連情報 (isIdenticalTo)
出版社版DOI
https://doi.org/10.1063/1.1504161