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Investigation of Carrier Conduction Mechanism over InAs/InP Quantum Dashes and InAs/GaAs Quantum Dots Based p-i-n Laser Heterostructures
Department of Physics, Faculty of Science and Letters, Yildiz Technical University, Istanbul, Turkey
Department of Physics, Faculty of Science and Letters, Yildiz Technical University, Istanbul, Turkey
Department of Physics, Faculty of Science and Letters, Yildiz Technical University, Istanbul, Turkey
- 1 Department of Physics, Faculty of Science and Letters, Yildiz Technical University, Istanbul, Turkey
- 2 Department of Physics, Faculty of Science and Letters, Yildiz Technical University, Istanbul, Turkey
- 3 Department of Physics, Faculty of Science and Letters, Yildiz Technical University, Istanbul, Turkey
Journal of Materials Science and Chemical Engineering·Volume 05 (2017)·Pages 1–9·Published 22 August 2017·DOI10.4236/msce.2017.59001
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Abstract
Charge transfer characteristics of the long wavelength semiconductor laser structures, containing quantum dot layers (QDs), were investigated by means of temperature dependent current-voltage and electroluminescence measurements over InAs/InP, and InAs/GaAs based p-i-n structures. In InAs/InP elongated QDs (QDashes) structure, injected carriers were tunneled from the quantum well into QDashes through a thin barrier and subsequently recombined within QDashes. Meanwhile, for InAs/GaAs structure, tunneling kind transport was exhibited in both forward and reverse bias voltage directions. The onset of light took place when the forward bias exceeded 1.3 V (3 V) for InAs/InP (InAs/GaAs) p-i-n structure through electroluminescence measurements. The peak value of emitted laser light for InAs/InP QDashes and InAs/GaAs QDs occurred in 1.55 μm and 1.3 μm, respectively.
KeywordsLong Wavelength Laser DiodeQuantum DotsQuantum DashesElectroluminescenceTemperature Dependent Currentdensity-Voltage Characteristics
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