Tests of the Rockwell Si:As Back-Illuminated Blocked-Impurity Band (BIBIB) detectors
Abstract
Two arrays of Rockwell's Si:As back-illuminated blocked-impurity-band detectors were tested at the Max-Planck-Institute for Astronomy (MPIA) at low background and low temperature for possible use in the astronomical space experiment ISOPHOT. For these measurements special test equipment was put together. A cryostat was mechanically modified to accommodate the arrays and special peripheral electronics was added to a microprocessor system to drive the cold multiplexer and to acquire the output data. The first device, a 16x50 element array on a fan-out board was used to test individual pixels with a trans-impedance-amplifier at a photon background of 10(exp 8) Ph s(-1)cm(-2) and at temperatures of 2.7 to 4.4 K. The noise-equivalent-power NEP is in the range 5 - 7 x 10(exp -18) WHz(exp -1/2), the responsivity is less than or equal to 100 AW(exp -1)(f = 10 Hz). The second device was a 10x50 array including a cold readout electronics of switched FETs (SWIFET). Measurements of this array were done in a background range of 5 x 10(exp 5) to 5 x 10(exp 11) Ph s(exp-1)cm(exp-2) and at operating temperatures between 3.0 and 4.8 K. The NEP ranges from less than 10(exp -18) at the lowest background to 2 x 10(exp -16) WHz(exp -1/2) at the highest flux.
- Publication:
-
Third Infrared Detector Technology Workshop
- Pub Date:
- October 1989
- Bibcode:
- 1989tidt.work..439W
- Keywords:
-
- Astronomy;
- Radiation Detectors;
- Spaceborne Experiments;
- Bias;
- Cryostats;
- Electric Potential;
- Low Temperature;
- Microprocessors;
- Multiplexing;
- Operating Temperature;
- Ph;
- Photometry;
- Photons;
- Pixels;
- Readout;
- Switching;
- Instrumentation and Photography