標題: Photoluminescence characterization of type-II Zn0.97Mn0.03Se/ZnSe0.92Te0.08 multiple-quantum-well structures
作者: Shiu, Jian-Jhin
Chen, Wei-Li
Lin, Der-Yuh
Yang, Chu-Shou
Chou, Wu-Ching
電子物理學系
Department of Electrophysics
關鍵字: photoluminescence;ZnMnSe;ZnSeTe;thermal activation energy;multiple quantum well
公開日期: 1-Apr-2007
摘要: The optical characterization of type-II Zn0.97Mn0.03Se/ZnSe0.92Te0.08 multiple-quantum-well structures has been studied using photoluminescence (PL), temperature-dependent PL, and power-dependent PL. The PL data reveal that the band alignment of the ZnMnSe/ZnSeTe multiple quantum wells (MQWs) is type II. In comparison with the theoretical calculation based on solving the Schrodinger equation of a square potential well, the valence band offset is estimated to be 0.6 eV. From the power-dependent PL spectra, it is observed that the peak position of PL spectra shows a blue shift on increasing the excitation power. The blue shift can be interpreted in terms of the band-bending effect due to spatially separated carriers in a type-II alignment and the band filling effect. The thermal activation energy (EA) for quenching the PL intensity was determined from temperature-dependent PL spectra. The thermal activation energy was found to decrease as the thickness of ZnMnSe or ZnSeTe layers decreased.
URI: http://dx.doi.org/10.1143/JJAP.46.2481
http://hdl.handle.net/11536/4981
ISSN: 0021-4922
DOI: 10.1143/JJAP.46.2481
期刊: JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS
Volume: 46
Issue: 4B
起始頁: 2481
結束頁: 2485
Appears in Collections:Conferences Paper


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