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Proceedings Paper

Photodetector development at Fraunhofer IAF: From LWIR to SWIR operating from cryogenic close to room temperature
Author(s): V. Daumer; V. Gramich; R. Müller; J. Schmidt; F. Rutz; T. Stadelmann; A. Wörl; R. Rehm
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Paper 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.

Paper Details

Date Published: 16 May 2017
PDF: 7 pages
Proc. SPIE 10177, Infrared Technology and Applications XLIII, 1017711 (16 May 2017); doi: 10.1117/12.2262509
Show Author Affiliations
V. Daumer, Fraunhofer-Institut für Angewandte Festkörperphysik (Germany)
V. Gramich, Fraunhofer-Institut für Angewandte Festkörperphysik (Germany)
R. Müller, Fraunhofer-Institut für Angewandte Festkörperphysik (Germany)
J. Schmidt, Fraunhofer-Institut für Angewandte Festkörperphysik (Germany)
F. Rutz, Fraunhofer-Institut für Angewandte Festkörperphysik (Germany)
T. Stadelmann, Fraunhofer-Institut für Angewandte Festkörperphysik (Germany)
A. Wörl, Fraunhofer-Institut für Angewandte Festkörperphysik (Germany)
R. Rehm, Fraunhofer-Institut für Angewandte Festkörperphysik (Germany)


Published in SPIE Proceedings Vol. 10177:
Infrared Technology and Applications XLIII
Bjørn F. Andresen; Gabor F. Fulop; Charles M. Hanson; John Lester Miller; Paul R. Norton, Editor(s)

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