Journal
APPLIED PHYSICS LETTERS
Volume 89, Issue 18, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.2385114
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Temperature-dependent photoluminescence (PL) measurements were performed to investigate the optical properties of CdTe/ZnTe nanostructures. The activation energy of the CdTe/ZnTe quantum dots (QDs) sandwiched between two quantum wells (QWs) with ZnTe separation barriers, as obtained from the temperature-dependent PL spectra, was much larger than the activation energies of the QDs alone and of the QDs combined with a single QW. This behavior can be attributed to a transfer of carriers from the QWs to the QDs through a separation layer due to a nonresonant multiphonon-assisted tunneling process resulting from carrier thermal emission. (c) 2006 American Institute of Physics.
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