Development of a cadmium telluride pixel detector for astrophysical applications

Details Development of a cadmium telluride pixel detector for astrophysical applications Development of a cadmium telluride pixel detector for astrophysical applications

Aug 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009spie.7435e..17m&link_type=abstract

UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XVI. Edited by Siegmund, Oswald H. Proceedings of the SPIE, Volume

Astronomy and Astrophysics

Astronomy

Scientific paper

We are developing imaging Cadmium Telluride (CdTe) pixel detectors optimized for astrophysical hard X-ray applications. Our hybrid detector consist of a CdTe crystal 1mm thick and 2cm × 2cm in area with segmented anode contacts directly bonded to a custom low-noise application specific integrated circuit (ASIC). The CdTe sensor, fabricated by ACRORAD (Okinawa, Japan), has Schottky blocking contacts on a 605 micron pitch in a 32 × 32 array, providing low leakage current and enabling readout of the anode side. The detector is bonded using epoxy-gold stud interconnects to a custom low noise, low power ASIC circuit developed by Caltech's Space Radiation Laboratory. We have achieved very good energy resolution over a wide energy range (0.62keV FWHM @ 60keV, 10.8keV FWHM @ 662keV). We observe polarization effects at room temperature, but they are suppressed if we operate the detector at or below 0°C degree. These detectors have potential application for future missions such as the International X-ray Observatory (IXO).

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