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  4. Thermoelectrically-Cooled InAs/GaSb Type-II Superlattice Detectors as an Alternative to HgCdTe in a Real-Time Mid-Infrared Backscattering Spectroscopy System
 
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2020
Zeitschriftenaufsatz
Titel

Thermoelectrically-Cooled InAs/GaSb Type-II Superlattice Detectors as an Alternative to HgCdTe in a Real-Time Mid-Infrared Backscattering Spectroscopy System

Abstract
We report on the development of thermoelectrically cooled (TE-cooled) InAs/GaSb type-II superlattice (T2SL) single element infrared (IR) photodetectors and exemplify their applicability for real-time IR spectroscopy in the mid-infrared in a possible application. As the European Union's Restriction of Hazardous Substances (RoHS) threatens the usage of the state-of-the-art detector material mercury cadmium telluride (MCT), RoHS-compatible alternatives toMCT have to be established for IR detection. We use bandgap engineered InAs/GaSb T2SLs to tailor the temperature-dependent bandgap energy for detection throughout the required spectral range. Molecular beam epitaxy of superlattice samples is performed on GaAs substrates with a metamorphic GaAsSb buffer layer. Photolithographic processing yields laterally-operated T2SL photodetectors. Integrated in a TE-cooled IR detector module, such T2SL photodetectors can be an alternative to MCT photodetectors for spectroscopy applications. Here, we exemplify this by exchanging a commercially available MCT-based IR detector module with our T2SL-based IR detector module in a real-time mid-infrared backscattering spectroscopy system for substance identification. The key detector requirements imposed by the spectroscopy system are a MHz-bandwidth, a broad spectral response, and a high signal-to-noise ratio, all of which are covered by the reported T2SL-based IR detector module. Hence, in this paper, we demonstrate the versatility of TE-cooled InAs/GaSb T2SL photodetectors and their applicability in an IR spectroscopy system.
Author(s)
Müller, Raphael
Fraunhofer-Institut für Angewandte Festkörperphysik IAF
Härtelt, Marko
Fraunhofer-Institut für Angewandte Festkörperphysik IAF
Niemasz, Jasmin
Fraunhofer-Institut für Angewandte Festkörperphysik IAF
Schwarz, Klaus
Fraunhofer-Institut für Angewandte Festkörperphysik IAF
Daumer, Volker
Fraunhofer-Institut für Angewandte Festkörperphysik IAF
Flores, Yuri V.
Fraunhofer-Institut für Angewandte Festkörperphysik IAF
Ostendorf, Ralf
Fraunhofer-Institut für Angewandte Festkörperphysik IAF
Rehm, Robert
Fraunhofer-Institut für Angewandte Festkörperphysik IAF
Zeitschrift
Micromachines
Project(s)
MIRPHAB
Funder
European Commission EC
DOI
10.3390/mi11121124
File(s)
N-624537.pdf (6.21 MB)
Language
Englisch
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IAF
Tags
  • InAs/GaSb

  • T2SL

  • IR

  • photodetector

  • TE-cooled

  • spectroscopy

  • RoHS

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