InAs/GaSb T2SL photodetector grown by MBE for gas imaging beyond infrared atmospheric window

Jian L. Zhan; Jing J. Xu; Bi C. Xia; Yu X. Song; Sheng Tao; Yi G. Wu; Wen Q. Ma

doi:10.1117/12.2651857

20 January 2023 InAs/GaSb T2SL photodetector grown by MBE for gas imaging beyond infrared atmospheric window

Jian L. Zhan, Jing J. Xu, Bi C. Xia, Yu X. Song, Sheng Tao, Yi G. Wu, Wen Q. Ma

Proceedings Volume 12555, AOPC 2022: Infrared Devices and Infrared Technology; and Terahertz Technology and Applications; 125550K (2023) https://doi.org/10.1117/12.2651857
Event: Applied Optics and Photonics China 2022 (AOPC2022), 2022, Beijing, China

Abstract

Air pollution monitoring is an important aspect of environment preservation, which is of more and more significance in modern society due to the increasing demand of healthy living condition and sustainable development. Infrared (IR) gas imaging is a fast and sensitive way of gas monitoring utilizing the signatures of different gas molecules in absorption spectrum. Our research and development on IR photodetectors based on the InAs/GaSb type-II superlattice (T2SL) material system with a cut-off wavelength beyond long wavelength infrared (LWIR) atmospheric window covering the absorption of sulfur hexafluoride (SF₆) around 10.55 μm will be reported. A new detector structure was designed with a reduced bandgap of the absorber, in conjunction with the unipolar barrier and other parts with specific band alignments. The material was grown by molecular beam epitaxy (MBE) with high structural quality. Single element detectors have been fabricated and shown high performances, including low dark current density 1.0 × 10⁻³ A/cm² and high resistance 1.0 × 10⁷ Ω for 30 × 30 μm diode at −0.1 V bias, and the surface leakage is also reduced effectively. The LWIR FPA fabrication for SF₆ detector is underway

Citation Download Citation

Jian L. Zhan, Jing J. Xu, Bi C. Xia, Yu X. Song, Sheng Tao, Yi G. Wu, and Wen Q. Ma "InAs/GaSb T2SL photodetector grown by MBE for gas imaging beyond infrared atmospheric window", Proc. SPIE 12555, AOPC 2022: Infrared Devices and Infrared Technology; and Terahertz Technology and Applications, 125550K (20 January 2023); https://doi.org/10.1117/12.2651857

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