16 May 2017 Photodetector development at Fraunhofer IAF: From LWIR to SWIR operating from cryogenic close to room temperature
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Abstract
Photodetectors in the non-visible region of the electromagnetic spectrum are essential for security, defense and space science as well as industrial and scientific applications. The research activities at Fraunhofer IAF cover a broad range in the infrared (IR) regime. Whereas short-wavelength IR (SWIR, <1.7 μm) detectors are realized by InGaAs/InP structures, InAs/GaSb type-II superlattice (T2SL) infrared detectors are developed for the spectral bands from mid- (MWIR, 3-5 μm) to long-wavelength IR (LWIR, 8-12 μm). We report on the extension of the superlattice empirical pseudopotential method (SEPM) to 300 K for the design of LWIR heterostructures for operation near room temperature. Recently, we have also adapted heterostructure concepts to our well established bi-spectral T2SL MWIR detector resulting in a dark current density below 2 × 10-9 A/cm2 for a cut-off wavelength close to 5 μm. Finally, we present first results obtained with a gated viewing system based on our InGaAs/InAlAs/InP avalanche photodiode arrays.
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V. Daumer, V. Gramich, R. Müller, J. Schmidt, F. Rutz, T. Stadelmann, A. Wörl, R. Rehm, "Photodetector development at Fraunhofer IAF: From LWIR to SWIR operating from cryogenic close to room temperature", Proc. SPIE 10177, Infrared Technology and Applications XLIII, 1017711 (16 May 2017); doi: 10.1117/12.2262509; https://doi.org/10.1117/12.2262509
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