Carrier Dynamics and Dynamic Band-Bending in Type-II ZnTe/ZnSe Quantum Dots

• Authors: M. Syperek , J. Misiewicz , C. Chan , D. Dumcenco , Y. Huang , W. Chou
• Languages of publication: EN

Abstracts

EN

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 Δ E depends on the dot size and the power density of excitation pulse. For the dots under study and given experimental conditions Δ E ≈ 28 ÷ 42 meV.

Keywords

EN

78.67.Hc; 78.55.Et; 78.47.J-

Discipline

• 78.55.Et: II-VI semiconductors
• 78.67.Hc: Quantum dots
• 78.47.J-: Ultrafast spectroscopy (<1>(see also 42.65.Re Ultrafast processes; optical pulse generation and pulse compression; 82.53.Mj Femtosecond probing of semiconductor nanostructures)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2013
• Volume: 124
• Issue: 5
• Pages: 821-823

Dates

published

2013-11

Contributors

author

M. Syperek

• Institute of Physics, Wrocław University of Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland

author

J. Misiewicz

• Institute of Physics, Wrocław University of Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland

author

C. Chan

• Department of Electronic Engineering, National Taiwan University of Science and Technology, Taipei 106, Taiwan

author

D. Dumcenco

• Department of Electronic Engineering, National Taiwan University of Science and Technology, Taipei 106, Taiwan

author

Y. Huang

• Department of Electronic Engineering, National Taiwan University of Science and Technology, Taipei 106, Taiwan

author

W. Chou

• Department of Electrophysics, National Chiao Tung University, Hsin Chu 300, Taiwan

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Identifiers

DOI

10.12693/APhysPolA.124.821