Activation energy and carriers dynamics of multilayer CdTe/ZnTe quantum dots with different ZnTe separation layer thicknesses
- Department of Physics, Yonsei University, Wonju 26493 (Korea, Republic of)
- Advanced Photonics Research Institute, Gwangju Institute of Science and Technology, Gwangju 61005 (Korea, Republic of)
We studied the optical properties of multilayer CdTe/ZnTe quantum dots (QDs) with various ZnTe separation layer thicknesses on GaAs substrates. The low temperature photoluminescence (PL) spectra show that the excitonic peaks in multilayer CdTe/ZnTe QDs shift to higher energy levels, and PL peak intensities increase with increasing ZnTe separation layer thickness. This is because of increasing uncoupling and because there are many more carriers confined in the QDs with wider separation layers. Temperature-dependent PL measurements showed that the activation energies of the confined electrons in the multilayer CdTe/ZnTe QDs decreases with decreasing ZnTe separation layer thickness. The time-resolved PL spectra show increasing carrier decay times with decreasing ZnTe separation layer thickness, due to increasing coupling between QDs with narrower separation layers.
- OSTI ID:
- 22730518
- Journal Information:
- Materials Research Bulletin, Vol. 96, Issue Part 3; Conference: International conference on advances in functional materials (AFM)-2016, Jeju Island (Korea, Republic of), 8-11 Aug 2016; Other Information: Copyright (c) 2017 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
- Country of Publication:
- United States
- Language:
- English
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