Si:As blocked-impurity-band detectors for ISO's photometer

Details Si:As blocked-impurity-band detectors for ISO's photometer Si:As blocked-impurity-band detectors for ISO's photometer

Sep 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995spie.2553..482w&link_type=abstract

Proc. SPIE Vol. 2553, p. 482-488, Infrared Spaceborne Remote Sensing III, Marija S. Scholl; Bjorn F. Andresen; Eds.

Astronomy and Astrophysics

Astronomy

Scientific paper

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.

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