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  4. InAs/(GaIn)Sb short-period superlattices for focal plane arrays
 
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2005
Conference Paper
Titel

InAs/(GaIn)Sb short-period superlattices for focal plane arrays

Alternative
Kurzperiodige InAs/(GaIn)Sb Übergitter für Bildfeldmatrizen
Abstract
An infrared camera based on a 256x256 focal plane array for the Mid-IR spectral range (3-5 mu m) has been realized for the first time with InAs/GaSb short-period superlattices. The detector shows a cut-off wavelength of 5.4 mu m and reveals a quantum efficiency of 30%. The noise equivalent temperature difference (NETD) reaches 9.4 mK at 73 K with F/2 optics and 6.5 ms integration time. Excellent thermal images with low NETD values and a very good modulation transfer function are presented. Furthermore, a new method to passivate InAs/GaInSb superlattice photodiodes for the 8-10 mu m regime is demonstrated. The approach is based on the epitaxial overgrowth of wet-etched mesa diodes using lattice matched AlGaAsSb. A complete suppression of surface leakage currents in small sized test diodes with 70 mu m diameter is observed.
Author(s)
Rehm, R.
Fraunhofer-Institut für Angewandte Festkörperphysik IAF
Walther, M.
Fraunhofer-Institut für Angewandte Festkörperphysik IAF
Schmitz, J.
Fraunhofer-Institut für Angewandte Festkörperphysik IAF
Fleißner, J.
Fraunhofer-Institut für Angewandte Festkörperphysik IAF
Fuchs, F.
Fraunhofer-Institut für Angewandte Festkörperphysik IAF
Cabanski, W.
Ziegler, J.
Hauptwerk
Infrared Technology and Applications XXXI. Vol.1
Konferenz
Infrared Technology and Applications Conference 2004
International Defense and Security Symposium (DSS) 2005
Thumbnail Image
DOI
10.1117/12.603420
Language
German
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Fraunhofer-Institut für Angewandte Festkörperphysik IAF
Tags
  • infrared absorption

  • Infrarot

  • superlattice

  • Übergitter

  • GaSb

  • thermal imaging

  • Thermographie

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