16 May 2017 Photodetector development at Fraunhofer IAF: From LWIR to SWIR operating from cryogenic close to room temperature
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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.
© (2017) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
V. Daumer, V. Daumer, V. Gramich, V. Gramich, R. Müller, R. Müller, J. Schmidt, J. Schmidt, F. Rutz, F. Rutz, T. Stadelmann, T. Stadelmann, A. Wörl, A. Wörl, R. Rehm, 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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