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22 July 2008 Cold performance tests of blocked-impurity-band Si:As detectors developed for DARWIN
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We report first results of laboratory tests of Si:As blocked-impurity-band (BIB) mid-infrared (4 to 28 μm) detectors developed by IMEC. These prototypes feature 88 pixels hybridized on an integrated cryogenic readout electronics (CRE). They were developed as part of a technology demonstration program for the future Darwin mission. In order to be able to separate detector and readout effects, a custom build TIA circuitry was used to characterize additional single pixel detectors. We used a newly designed test setup at the MPIA to determine the relative spectral response, the quantum efficiency, and the dark current. All these properties were measured as a function of operating temperature and detector bias. In addition the effects of ionizing radiation on the detector were studied. For determining the relative spectral response we used a dualgrating monochromator and a bolometer with known response that was operated in parallel to the Si:As detectors. The quantum efficiency was measured by using a custom-build high-precision vacuum black body together with cold (T ~ 4K) filters of known (measured) transmission.
© (2008) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Stephan M. Birkmann, Jutta Stegmaier, Ulrich Grözinger, Oliver Krause, Tim Souverijns, Jan Putzeys, Deniz Sabuncuoglu Tezcan, Koen De Munck, Paolo Fiorini, Kiki Minoglou, Patrick Merken, Chris Van Hoof, and Piet De Moor "Cold performance tests of blocked-impurity-band Si:As detectors developed for DARWIN", Proc. SPIE 7021, High Energy, Optical, and Infrared Detectors for Astronomy III, 70210R (22 July 2008);

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