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Photodetector development at Fraunhofer IAF. From LWIR to SWIR operating from cryogenic close to room temperature

: Daumer, Volker; Gramich, Vera; Müller, Raphael; Schmidt, Johannes; Rutz, Frank; Stadelmann, Tim; Wörl, Andreas; Rehm, Robert


Andresen, Björn F. (Ed.) ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Infrared Technology and Applications XLIII : Anaheim, California, United States, April 9, 2017
Bellingham, WA: SPIE, 2017 (Proceedings of SPIE 10177)
Paper 1017711, 7 S.
Conference "Infrared Technology and Applications" <43, 2017, Anaheim/Calif.>
Fraunhofer IAF ()
SWIR; MWIR; LWIR; T2SL; InAs/GaSb type-II superlattice photodetector; InGaAs; InAlAs; avalanche photodiode; APD

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.