Browsing by Author "Misiewicz, J."

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Carrier Dynamics and Dynamic Band-Bending in Type-II ZnTe/ZnSe Quantum Dots
(2013-11-01)
Syperek, M.
;
Misiewicz, J.
;
Chan, C. H.
;
Dumcenco, D. O.
;
Huang, Y. S.
Carrier dynamics and dynamic band-bending in self-assembled ZnTe/ZnSe quantum dots have been studied by means of time-resolved photoluminescence experiment at low temperatures. The experiment reveals clearly type-II character of the confinement potential in the dot manifested in: (i) long photoluminescence decay time constant of 28-35 ns, and (ii) temporal shift of the quantum dot peak emission towards low energy following the laser pulse excitation. The magnitude of the spectral shift Delta E depends on the dot size and the power density of excitation pulse. For the dots under study and given experimental conditions Delta E approximate to 28 divided by 42 meV.