Impressive Reduction of Dark Current in InSb Infrared Photodetector to achieve High Temperature Performance

Subject Areas : Journal of Optoelectronical Nanostructures

Saman Salimpour ¹ (Department of Electrical Engineering, Tabriz Branch, Islamic Azad University, Tabriz, Iran.)
Hassan Rasooli Saghai ² (Department of Electrical Engineering, Tabriz Branch, Islamic Azad University, Tabriz, Iran.)

Received: 2018-07-31 Accepted : 2019-01-21 Published : 2018-10-01

Keywords: InSb Infrared Photodetector, High Temperature, Dark Current, Detectivity, Hetero Structure,

Abstract :

Infrared photo detectors have vast and promising applications in military,
industrial and other fields. In this paper, we present a method for improving the
performance of an infrared photodetector based on an InSb substance. To achieve good
performance at high temperatures, thermal noise and intrusive currents should be
reduced. For this purpose, a five-layer hetero structure photodetector based on We
introduce n+ InSb / n+ In1-xAlxSb / π InSb / p+ In1-xGaxSb / p+ InSb to improve the
thermal performance in the mid-wavelength infrared (MWIR) range. With inserting of
two thin layers from InAlSb and InGaSb on both side of the new (π) optical absorber created a
barrier in the structure that prevents from entrance of diffusion currents and noise carriers at n+
and p+ regions into the active area. And also by reducing the density of unwanted carriers in the
active layer, leads to decrease dark current, which is the main limiting factor for photodetectors’
performance based on InSb. Our proposed design reduced 49% dark current, increased
57% resistivity (R0) and increased 39% detectivity at 300K. Simulation of the structure
was done using the SILVACO ATLAS software.

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