11 June 2013 Development status of Type II superlattice infrared detector in JAXA
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Abstract
We present the development status of Type II superlattice (T2SL) infrared detector in JAXA. Since 2009, we have started a basic research on InAs/GaSb T2SL infrared detectors. Our final goal is to realize the T2SL array detector having a cutoff wave length of λc=15 μm. In order to confirm a technical feasibility of 15 μm cutoff T2SL detector, we fabricated T2SL samples having a different thickness of InAs/ 7 monolayers (ML) GaSb. These crystals are designed for the cutoff wavelength from 6 μm to 15 μm. The X-ray Diffraction measurement shows a mismatch between the substrate and superlattice layers is below 0.006%. The surface morphology of the samples with an atomic force microscope is 1.5-3.3 Å RMS for 5×5 μm square regions. We also fabricated single pixel detectors with these crystals. We show the results of the spectral response measurement using a FTIR system. We also show the development status of an array detector. The array detector having the cutoff wavelength of 6 μm is successfully demonstrated. However, further improvements are required for a future 15 μm cutoff array detector.
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Haruyoshi Katayama, Junpei Murooka, Masataka Naitoh, Ryota Sato, Satoshi Kawasaki, Yudai Itoh, Syota Sugano, Tomoko Takekawa, Masafumi Kimata, Mikhail Patrashin, Iwao Hosako, Yasuhiro Iguchi, "Development status of Type II superlattice infrared detector in JAXA", Proc. SPIE 8704, Infrared Technology and Applications XXXIX, 870416 (11 June 2013); doi: 10.1117/12.2015704; https://doi.org/10.1117/12.2015704
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