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We report first results of laboratory tests of Si:As blocked-impurity-band(BIB) mid-infrared (4 to 28 um) detectors developed by IMEC. These prototypesfeature 88 pixels hybridized on an integrated cryogenic readout electronics(CRE). They were developed as part of a technology demonstration program forthe future DARWIN mission. In order to be able to separate detector and readouteffects, a custom build TIA circuitry was used to characterize additionalsingle pixel detectors. We used a newly designed test setup at the MPIA todetermine the relative spectral response, the quantum efficiency, and the darkcurrent. All these properties were measured as a function of operatingtemperature and detector bias. In addition the effects of ionizing radiation onthe detector were studied. For determining the relative spectral response weused a dual-grating monochromator and a bolometer with known response that wasoperated in parallel to the Si:As detectors. The quantum efficiency wasmeasured by using a custom-build high-precision vacuum black body together withcold (T ~ 4 K) filters of known (measured) transmission.

Cold performance tests of blocked-impurity-band Si:As detectors developed for DARWIN