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

Juergen Wolf; Lorenz Wiest; Ulrich Groezinger; Dietrich Lemke; Josef Schubert

doi:10.1117/12.221379

29 September 1995 Si:As blocked-impurity-band detectors for ISO's photometer

Juergen Wolf, Lorenz Wiest, Ulrich Groezinger, Dietrich Lemke, Josef Schubert

Proceedings Volume 2553, Infrared Spaceborne Remote Sensing III; (1995) https://doi.org/10.1117/12.221379
Event: SPIE's 1995 International Symposium on Optical Science, Engineering, and Instrumentation, 1995, San Diego, CA, United States

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, NEP_DET 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.

Citation Download Citation

Juergen Wolf, Lorenz Wiest, Ulrich Groezinger, Dietrich Lemke, and Josef Schubert "Si:As blocked-impurity-band detectors for ISO's photometer", Proc. SPIE 2553, Infrared Spaceborne Remote Sensing III, (29 September 1995); https://doi.org/10.1117/12.221379

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