標題: Carrier relaxation of ZnCdSe/ZnSe quantum wells
作者: Jang, Der-Jun
Lee, Meng-En
Chung, Yung-Hsien
Yang, Chu-Shou
Chou, Wu-Ching
電子物理學系
Department of Electrophysics
關鍵字: ZnCdSe;quantum well;carrier capture;hot carrier;energy relaxation;optical phonon
公開日期: 1-Sep-2008
摘要: The energy relaxations of Zno(0.91)Cd(0.09)Se multiquantum wells and epilayer structures were studied with an ultrafast time-resolved photoluminescence apparatus. The increase in the rise time of photoluminescence with decreasing photon energy and the redshift of the peak energy of time-resolved photoluminescence spectra with the delay time are attributed to the band-filling effect and energy relaxation of hot carriers. The derived carrier temperature decreases rapidly within the first 10 ps after photoexcitation and tit a much slower rate thereafter. The fast carrier cooling can be explained by the longitudinal optical (LO) phonon emissions by carriers through the Frohlich interaction. The obtained effective scattering times of carrier and LO phonons are comparable to the theoretical prediction of 20 fs for multi-quantum well (MQW) of 20 nm well thickness and the epilayer. The slow carrier capture process may account for the long effective scattering time of 35 fs for the MQWs of 5 nm well thickness.
URI: http://dx.doi.org/10.1143/JJAP.47.7056
http://hdl.handle.net/11536/8395
ISSN: 0021-4922
DOI: 10.1143/JJAP.47.7056
期刊: JAPANESE JOURNAL OF APPLIED PHYSICS
Volume: 47
Issue: 9
起始頁: 7056
結束頁: 7059
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