Improving the performance of a far-infrared quantum-ring-based photodetector utilizing asymmetric multi-barrier resonant tunneling |
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| Affiliation: | 1. Department of Electrical Engineering, Mahabad Branch, Islamic Azad University, Mahabad, Iran;2. Department of Electrical Engineering, Faculty of Electrical and Computer Engineering, Shahid Beheshti University, G.C. 1983963113, Tehran, Iran;3. Department of Electrical Engineering, Urmia Branch, Islamic Azad University, Urmia, Iran;1. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China;2. School of Science, Harbin University of Science and Technology, Harbin 150080, China |
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| Abstract: | In this paper, a novel structure for quantum ring inter-subband photodetectors (QRIP) is proposed to reduce its dark current. Some additional layers including asymmetric multi-barrier resonant tunneling (AMBRT) in absorption region layers are exploited to provide near unity tunneling probability for generated photocurrents and completely reject thermally generated electrons. AMBRT structure consists of three asymmetric AlGaAs barriers and two InGaAs wells which are designed for operation wavelength of generated photocurrents by absorption of 20 μm. Simulation results show that AMBRT can considerably reduce the dark current compared to previously proposed resonant tunneling structure about three orders of magnitude. As a consequent, higher specific detectivity for AMBRT-QRIP is obtained in the order of ∼1011 cm Hz1/2/W at 100 K. |
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| Keywords: | Quantum ring inter-subband photodetector Dark current Resonant tunnelling barrier Detectivity |
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