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Electro-optical properties of InAs/GaSb superlattice infrared photodiodes for bispectral detection

: Wörl, A.; Rutz, F.; Rehm, R.; Masur, J.-M.; Kleinow, P.; Schmitz, J.; Niemasz, J.; Luppold, W.; Stadelmann, T.; Walther, M.; Simon, T.; Scheibner, R.; Ziegler, J.


AMA Fachverband für Sensorik e.V., Wunstorf:
AMA Conferences 2013. Proceedings. With SENSOR, OPTO, IRS 2. CD-ROM : Nürnberg Exhibition Centre, Germany, 14. - 16.5.2013
Wunstorf: AMA Service, 2013
ISBN: 978-3-9813484-3-9
International Conference on Infrared Sensors & Systems (IRS2) <13, 2013, Nuremberg>
Fraunhofer IAF ()
InAs/GaSb type-II superlattice; bispectral infrared imager; carbon dioxide detection; focal plane array; electro-optical characterization

InAs/GaSb short-period superlattices have proven their large potential for high-performance focal plane array infrared detectors. They are fabricated as monospectral and bispectral infrared detectors for a wavelength range between 3-30 µm with very high responsivity and thus comparable to state-ofthe-art CdHgTe and InSb detectors. Dual-color, mid-wavelength infrared InAs/GaSb superlattice camera systems offer simultaneous and spatially coincident detection on a millisecond time scale in both spectral channels between 3-4 µm and 4-5 µm. Thus, these cameras are very sensitive to the spectral signature of carbon dioxide at approximately 4.3 µm and can be used for remote imaging of CO(2). In a molecular beam epitaxy based process, eleven 288 × 384 dual-color detector arrays are fabricated on 3" GaSb substrates. Very homogeneous detector arrays with an excellent noise equivalent temperature difference have been realized. This article presents the InAs/GaSb type-II superlattice dual-color concept, its results, and delivers insights into a range of test methodologies which ensure that the basic requirements for achieving high detector performance are fulfilled.