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Development of an ultra-low-power x-ray-photon-resolving imaging detector array

2010; SPIE; Volume: 7805; Linguagem: Inglês

10.1117/12.860671

1996-756X

Shunming Sun, S. W. Downey, Stephen D. Gaalema, James L. Gates, J. G. Jernigan, P. Kaaret, Scott MacIntosh, Brian D. Ramsey, Bruce Wall,

Chalcogenide Semiconductor Thin Films

We report on progress to develop and demonstrate CZT and Si hybrid detector arrays for future NASA missions in X-ray and Gamma-ray astronomy. The primary goal for these detectors is consistent with the design concept for the EXIST mission 1 and will also be appropriate for other NASA applications and ground-based projects. In particular we target science instruments that have large aperture (multiple square meters) and therefore require a low power ROIC (readout integrated circuits) design (< 10 microwatt per pixel in quiescent mode). The design also must achieve good energy resolution for single photon detection for X rays in the range 5-600 keV with a CZT sense layer and 2-30 keV with a Si sense layer. The target CZT arrays are 2 cm × 2 cm with 600 micron square-shaped pixels. The low power smart pixel detects rare X-ray hits with an adjustable threshold setting. A test array of 7 × 5 pixels with a 5 mm thick CZT sense layer demonstrates that the low power pixel can successfully detect X-rays with ~50 readout noise electrons RMS.