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
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