Calculation of the dark current in a quantum well infrared photodetector |
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| Institution: | 1. Department of Electromagnetic Field, Czech Technical University in Prague, 2 Technicka, 16627 Prague, Czech Republic;2. Technical University of Ostrava, 17, Listopadu 15/2172, Ostrava 70833, Czech Republic;3. Optical Communications Research Group, NCRLab, Faculty of Engineering and Environment, Northumbria University, Newcastle-upon-Tyne NE1 8ST, UK;1. Young Researchers and Elite Club, Shiraz Branch, Islamic Azad University, Shiraz, Iran;2. Young Researchers and Elite Club, Zarghan Branch, Islamic Azad University, Zarghan, Iran;3. Department of Physics, Science and Research Branch, Islamic Azad University, Fars, Iran;4. Marvdasht Branch, Islamic Azad University, Marvdasht, Iran;1. Department of Physics, Universiteit Antwerpen, Antwerpen, Belgium;2. imec, Kapeldreef 75, 3001 Heverlee, Belgium;3. Department of Materials Science and Engineering, The University of Texas at Dallas, Dallas, USA;1. Department of Electrical Engineering, Indian Institute of Technology Bombay, Powai, Mumbai, 400076, India;2. Photonics Division, Society for Applied Microwave Engineering Electronics and Research, IIT Powai Campus, Mumbai, 400076, India;3. Department of Mechanical Engineering, Indian Institute of Technology Bombay, Powai, Mumbai, 400076, India |
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| Abstract: | Dark currents in a biased quantum well fabricated using Al0.27Ga0.73As/GaAs heterojunctions are calculated at two different temperatures including thermionic field emission currents arising from the electron scattering with phonons and plasmons. In the electron–phonon scattering process several modes due to heterojunctions such as the confined, half-space and interface longitudinal optic phonons are taken into account. It is found that the confined phonon scattering process results in maximum currents compared to those obtained in the half-space and interface scattering modes. However, the magnitude of the currents that resulted from the electron–plasmon scattering process is found to be higher than that found from the electron scattering with confined phonons. Comparison of the calculated dark currents with experiments shows that the thermionic emission currents due to phonon and plasmon assisted processes are essential to get better agreement with experiments than the previously employed bulk phonon scattering process. |
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