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

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

Other Title
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, Robert  
Fraunhofer-Institut für Angewandte Festkörperphysik IAF  
Walther, Martin  
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.
Mainwork
Infrared Technology and Applications XXXI. Vol.1  
Conference
Infrared Technology and Applications Conference 2004  
International Defense and Security Symposium (DSS) 2005  
DOI
10.1117/12.603420
Language
German
Fraunhofer-Institut für Angewandte Festkörperphysik IAF  
Keyword(s)
  • infrared absorption

  • Infrarot

  • superlattice

  • Übergitter

  • GaSb

  • thermal imaging

  • Thermographie

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