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Author Su, Linlin ♦ Liang, Baolai ♦ Wang, Ying ♦ Guo, Qinglin ♦ Wang, Shufang ♦ Fu, Guangsheng ♦ Wang, Zhiming M. ♦ Mazur, Yuriy I. ♦ Ware, Morgan E. ♦ Salamo, Gregory J.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS ♦ ALIGNMENT ♦ CARRIERS ♦ COUPLING ♦ EXCITATION ♦ MILLI EV RANGE ♦ OPTICAL PROPERTIES ♦ PHOTOLUMINESCENCE ♦ QUANTUM DOTS ♦ RED SHIFT ♦ TEMPERATURE RANGE 0065-0273 K
Abstract Optical properties of In{sub 0.46}Al{sub 0.54}As/Ga{sub 0.46}Al{sub 0.54}As quantum dots (QDs) have been investigated by photoluminescence (PL). At a low temperature of 8 K, the PL peak energy blue-shifts 44 meV and the linewidth broadens by 21 meV as the excitation intensity increases by four orders of magnitude. As the temperature increases, the QD spectra demonstrate a fast redshift and narrowing from ∼35 K. These observations have been explained by the type-II nature of QDs and the lateral carrier transfer due to electronic coupling between neighboring QDs. A special double exponential decay behavior indicates the coexistence of type-I and type-II band alignment in this QD sample.
ISSN 00036951
Educational Use Research
Learning Resource Type Article
Publisher Date 2015-11-02
Publisher Place United States
Journal Applied Physics Letters
Volume Number 107
Issue Number 18