Leakage Currents and Capacitances of Thick CZT Detectors

Details Leakage Currents and Capacitances of Thick CZT Detectors Leakage Currents and Capacitances of Thick CZT Detectors

2009-03-31

arxiv.org/abs/0903.5518v1

Astronomy and Astrophysics

Astrophysics

Instrumentation and Methods for Astrophysics

Proceedings of IEEE NSS-MIC October 2007 Hawaii

Scientific paper

The quality of Cadmium Zinc Telluride (CZT) detectors is steadily improving. For state of the art detectors, readout noise is thus becoming an increasingly important factor for the overall energy resolution. In this contribution, we present measurements and calculations of the dark currents and capacitances of 0.5 cm-thick CZT detectors contacted with a monolithic cathode and 8x8 anode pixels on a surface of 2 cm x 2 cm. Using the NCI ASIC from Brookhaven National Laboratory as an example, we estimate the readout noise caused by the dark currents and capacitances. Furthermore, we discuss possible additional readout noise caused by pixel-pixel and pixel-cathode noise coupling.

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