標題: Carrier Dynamics in Self-Assembled CdTe Stranski-Krastanow Quantum Dots Grown on ZnSe by Molecular Beam Epitaxy
作者: Yang, C. S.
Chin, K. F.
Lai, J. Y.
Luo, C. W.
Chou, W. C.
Shih, Y. T.
Wang, J. S.
Jian, S. R.
電子物理學系
Department of Electrophysics
關鍵字: CdTe QDs;Molecular beam epitaxy;Carrier dynamics;TRPL
公開日期: 1-Nov-2008
摘要: Self-assembled CdTe/ZnSe Stranski-Krastanow quantum-dot (QD) structures, which have a CdSe-like precursor-layer (PCL) between CdTe quantum dots and ZnSe matrix, were grown by molecular beam epitaxy. The carrier dynamics of the structures was studied by photoluminescence (PL) and time-resolved photoluminescence (TRPL) measurements. The temperature-dependent PL spectra revealed that there is a carrier transformation from small dots to larger dots via the precursor layer. Temperature-dependent PL measurements verify the existence of the QD excited excitonic state in 5.0 mono-layer (ML) coverage. In 0.6 ML coverage, the TRPL spectra exhibited a double-exponential decay process, as the detection energy at PCL emission energy. The faster decay time is corresponded to the carrier lifetime in PCL, the slower decay time exhibits the carrier in small QD. However, in 5.0 ML coverage, a faster and slower decay time represents the carrier lifetime in QD excited state for larger QD and the carrier lifetime in QD ground state for smaller QD.
URI: http://hdl.handle.net/11536/28720
ISSN: 0374-4884
期刊: JOURNAL OF THE KOREAN PHYSICAL SOCIETY
Volume: 53
Issue: 5
起始頁: 2905
結束頁: 2908
Appears in Collections:Conferences Paper