Abstract
In this paper, a quantum cascade photodetector based on intersubband transitions in quantum wells with ability of detecting 1.33 μm and 1.55 μm wavelengths in two individual current paths is introduced. Multi quantum wells structures based on III-Nitride materials due to their large band gaps are used. In order to calculate the photodetector parameters, wave functions and energy levels are obtained by solving 1-D Schrodinger–Poisson equation self consistently at 80 ?K. Responsivity values are about 22 mA/W and 18.75 mA/W for detecting of 1.33 μm and 1.55 μm wavelengths, respectively. Detectivity values are calculated as 1.17 × 107 (Jones) and 2.41 × 107 (Jones) at wavelengths of 1.33 μm and 1.55 μm wavelengths, respectively.
Highlights
Quantum well infrared photodetectors (QWIPs) as thermal imagers using focal plane arrays (FPAs) have been studied extensively [1] [2] [3]
A quantum cascade photodetector based on intersubband transitions in quantum wells with ability of detecting 1.33 μm and 1.55 μm wavelengths in two individual current paths is introduced
Detectivity values are calculated as 1.17 × 107 (Jones) and 2.41 × 107 (Jones) at wavelengths of 1.33 μm and 1.55 μm wavelengths, respectively
Summary
Quantum well infrared photodetectors (QWIPs) as thermal imagers using focal plane arrays (FPAs) have been studied extensively [1] [2] [3]. For electronic transport QWIPs operate at photoconductive and photovoltaics modes. QWIPs based on photovoltaic mode are promising devices operating in high temperature and longer wavelength applications because of having no external voltage bias and dark current [4]. Quantum cascade detectors (QCDs) operating in photovoltaics mode are promising devices for small pixel large area FPAs, multicolor detection and demultip-. In QCD structure Multi quantum wells (MQWs) are designed dependant on detected wavelengths [6] [7] [8] [9] [10]. A QCD for detecting of 1.33 μm and 1.55 μm wavelengths in individual current paths based on intersubband transitions in AlGaN/AlN MQWs is designed. Detectivity values are calculated as 1.17 × 107 (Jones) and 2.41 × 107 (Jones) at wavelengths of 1.33 μm and 1.55 μm respectively
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