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CZT pixel detectors equipped with effective Ohmic contacts; their spectroscopic performance and the enigma of why they thus behave

The performance of CZT pixel detectors, with dedicated ICs and electronic processors, have been demonstrated. These nuclear imaging modules, developed primarily for the medical market, may be utilized for other applications, such as large area nuclear spectrometers. An improved crystal growth technique ensures a practical supply of wafers of which high performance detectors are fabricated. We believe that the high spectroscopic quality of these detectors stems from their effective Ohmic behavior, coupled with the geometrical, 'small pixel' effect. The Ohmic operation of these detectors has been described in a schematic way only, where the detailed non-equilibrium mechanism, responsible for it, still remains to be explained in detail. The IMARAD detector type 2, with contacts which strongly limit the dark current, exhibit even improved spectroscopic behavior, due to a dynamic Ohmic behavior of these contacts.