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Proceedings Paper

Si:As blocked-impurity-band detectors for ISO's photometer
Author(s): Juergen Wolf; Lorenz Wiest; Ulrich Groezinger; Dietrich Lemke; Josef Schubert
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Paper Abstract

ISOPHOT is one of the four focal plane instruments of the astronomical infrared space observatory (ISO). In its flight spare model the sensitivity of two photo-polarimeters could be significantly improved by replacing bulk Si:Ga and Si:B detectors by Si:As blocked impurity- band detectors. These detector elements were selected for low dark current to allow for low background observations in the LHe-cooled ISO telescope. Their operational parameters temperature and bias voltage were optimized for best sensitivity when operated with the ISOPHOT cryogenic readout electronics. At fluxes of about 10-16 W/pixel and temperatures of 2.9-3.6 K, NEPDET equals 5 X 10-18 W/Hz and R equals 23-36 A/W were measured. Their dynamic flux response is much faster than in bulk Si:Ga. Radiation-hardness has been tested by simulating the passage through the radiation belts on the ISO-orbit with a gamma source.

Paper Details

Date Published: 29 September 1995
PDF: 7 pages
Proc. SPIE 2553, Infrared Spaceborne Remote Sensing III, (29 September 1995); doi: 10.1117/12.221379
Show Author Affiliations
Juergen Wolf, Max-Planck-Institut fuer Astronomie (Germany)
Lorenz Wiest, Max-Planck-Institut fuer Astronomie (Germany)
Ulrich Groezinger, Max-Planck-Institut fuer Astronomie (Germany)
Dietrich Lemke, Max-Planck-Institut fuer Astronomie (Germany)
Josef Schubert, Max-Planck-Institut fuer Astronomie (Germany)

Published in SPIE Proceedings Vol. 2553:
Infrared Spaceborne Remote Sensing III
Marija Strojnik; Bjorn F. Andresen, Editor(s)

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