Charge sharing effect on 600 μm pitch pixelated CZT detector for imaging applications

We are currently investigating the spatial resolution of highly pixelated Cadmium Zinc Telluride (CZT) detector for imaging application. A 20 mmx20 mmx5 mm CZT substrate was fabricated with 600 mu m pitch pixels (500 mu m anode pixels with 100 mu m gap) and coplanar cathode. Charge sharing between two pixels was studied using collimated a 122 keV gamma ray source. Experiments show a resolution of 125 mu m FWHM for double-pixel charge sharing events when the 600 mu m pixelated and 5 mm thick CZT detector biased at 1000 V. In addition, we analyzed the energy response of the 600 mu m pitch pixelated CZT detector.