11 June 2013 High-performance MWIR type-II superlattice detectors
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A VGA format type-II superlattice focal plane array (FPA) for the mid-wave infrared (MWIR) atmospheric window has been designed, manufactured and characterized. The detector material is based on a heterojunction structure with a barrier that effectively decreases the Shockley-Read-Hall based component of the dark current. A very effective passivation method has been used which successfully inhibits all surface leakage currents. The barrier structure has a 50 % cutoff at 5 µm and 65 % quantum efficiency without antireflective coating. The dark current density is 3×10-6 A/cm2 at -0.05 V bias and 120 K. The optical cavity of the detector has been optimized for maximum capture of available light in the MWIR window. A focal plane array with 640 by 512 pixels and 15 µm pitch was processed based on this barrier structure. High-quality imagery in a system with high F-number will be presented.
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Henk Martijn, Carl Asplund, Rickard Marcks von Würtemberg, Hedda Malm, "High-performance MWIR type-II superlattice detectors", Proc. SPIE 8704, Infrared Technology and Applications XXXIX, 87040Z (11 June 2013); doi: 10.1117/12.2016602; https://doi.org/10.1117/12.2016602

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