15 April 2008 Antimony-based superlattices for high-performance infrared imagers
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InAs/GaSb short-period superlattices (SL) for the fabrication of mono- and bispectral thermal imaging systems in the mid-wavelength infrared region (MWIR) have been optimized in order to increase the spectral response of the imaging systems. The responsivity in monospectral InAs/GaSb short-period superlattices increases with the number of periods in the intrinsic region of the diode and does not show a diffusion limited behavior for detector structures with up to 1000 periods. This allows the fabrication of InAs/GaSb SL camera systems with high responsivity. Dual-color MWIR/MWIR InAs/GaSb SL camera systems with high quantum efficiency for missile approach warning systems with simultaneous and spatially coincident detection in both spectral channels have been realized.
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Martin Walther, Robert Rehm, Johannes Schmitz, Frank Rutz, Joachim Fleissner, Johann Ziegler, "Antimony-based superlattices for high-performance infrared imagers", Proc. SPIE 6940, Infrared Technology and Applications XXXIV, 69400A (15 April 2008); doi: 10.1117/12.777515; https://doi.org/10.1117/12.777515

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