18 April 2018 Modeling of pyramidal shape quantum dot infrared photodetector: the effects of temperature and quantum dot size
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Abstract
Quantum dot base infrared detectors have many advantages such as lower dark current, higher operating temperature, higher photoconductive gain, and broader infrared response. For this reason, we have studied a pyramidal shape quantum-dot infrared photodetector (QDIP) in which the different mechanisms of noise and dark current, the effects of QD size variation, the temperature, and applied electric field are considered. Self-assembled In0.3Ga0.7As  /  GaAs pyramidal shape quantum dots have been considered and optical properties in the conduction band using effective mass Schrodinger equation by the finite-difference time-domain (FDTD) method have been analyzed. Finally, the detectivity calculated as functions of the applied electrical field and temperature. For example, at the T  =  77  °  K and E  =  2  kV  /  cm, the detectivity is 3  ×  1013  cmHz  −  1/2  /  W.
© 2018 Society of Photo-Optical Instrumentation Engineers (SPIE)
Hossein Fazlalipour, Hossein Fazlalipour, Asghar Asgari, Asghar Asgari, Ghaffar Darvish, Ghaffar Darvish, } "Modeling of pyramidal shape quantum dot infrared photodetector: the effects of temperature and quantum dot size," Journal of Nanophotonics 12(2), 026006 (18 April 2018). https://doi.org/10.1117/1.JNP.12.026006 . Submission: Received: 5 January 2018; Accepted: 27 March 2018
Received: 5 January 2018; Accepted: 27 March 2018; Published: 18 April 2018
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