Abstract
Transition behavior from uncoupled to coupled multiple stacked CdSe/ZnSe quantum-dot (QD) arrays grown by molecular beam epitaxy were investigated. Transmission electron microscopy showed that vertically stacked self-assembled CdSe QD arrays were embedded in the ZnSe barriers. The results for the photoluminescence (PL) data at 18 K demonstrated clearly that the transition behavior from uncoupled to coupled peaks depended on the ZnSe barrier thickness. The temperature-dependent PL measurements showed that the activation energy of the electrons confined in the CdSe QDs increased dramatically with decreasing ZnSe spacer layer thickness due to the strong coupling between CdSe/ZnSe QD arrays. The present observations can help improve understanding of the dependence of the coupling behavior and activation energy in CdSe/ZnSe QDs on the spacer layer thickness.
Original language | English |
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Pages (from-to) | 191-195 |
Number of pages | 5 |
Journal | Solid State Communications |
Volume | 133 |
Issue number | 3 |
DOIs | |
Publication status | Published - 2005 Jan |
Bibliographical note
Funding Information:The work at Hanyang University was supported by grant No. R02-2003-000-10030-0 from the Basic Research Program of the Korea Science and Engineering Foundation and also supported by the Korea Science and Engineering Foundation through Quantum-functional Semiconductor Research Center at Dongguk University. The work at University of Notre Dame supported by the National Science Foundation Grant DMR 0072897.
Keywords
- A. Nanostructures
- B. Epitaxy
- D. Optical properties
ASJC Scopus subject areas
- General Chemistry
- Condensed Matter Physics
- Materials Chemistry