Modeling of pyramidal shape quantum dot infrared photodetector: the effects of temperature and quantum dot size

作者：Fazlalipour, Hossein; Asgari, Asghar^*; Darvish, Ghaffar

来源：Journal of Nanophotonics, 2018, 12(2): 026006.

DOI：10.1117/1.JNP.12.026006

• temperature effects
• infrared photodetector
• pyramidal QDs

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 degrees K and E = 2 kV/cm, the detectivity is 3 x 10(13) cmHz(-1/2)/W.

• 出版日期2018-4