Properties of Germanium Photoconductor Detectors

E. Young, J. Stansberry, K. D. Gordon, & J. Cadien 2003, in "The calibration legacy of the ISO Mission", eds. L. Metcalfe, A. Salama, S.B. Peschke and M. F. Kessler, (ESA), 231

This paper discusses the use of germanium photoconductors as Far Infrared detectors in space astronomy. In the wavelength range 50 to 240 microns, these devices are still the most sensitive detectors available. The theory of operation of ideal detectors as well as examples of non-ideal behaviour are presented. Included in the theory of operation is a brief discussion of the key role the cryogenic amplifier has on system performance. Of particular emphasis will be the effects of the ionising radiation environment on the performance of the detectors. Examples are given of the performance in past space astronomical missions. The development of the SIRTF large format arrays is described, and test results are presented. We discuss the technical and operational improvements that will help mitigate problems seen in earlier missions.

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