Characterization of charge carrier collection in a CdZnTe Frisch collar detector with a highly collimated 137Cs137Cs source

A 4.7 ×4.7×9.5 mm3 CdZnTe Frisch collar device was characterized through probing the device with a highly collimated Cs137 662 keV gamma ray source. In a systematic series of experiments, the detector was probed along the length and width with a Cs137 gamma ray source using a 43.0 mm long Pb-collimator with a 0.6 mm circular hole. The detector was probed along the central line under different operating voltages of 1200, 1000, 800, 600 and 400 V. The experimental results correlated well to charge collection calculations for a modeled device with the same size and operating conditions. It was proved that, unlike the planar configuration, the charge collection efficiency profile along the length of Frisch collar device is considerably improved. The CdZnTe raw materials for this study were acquired from Redlen Technologies, and the Frisch collar device was fabricated and characterized at S.M.A.R.T. Laboratory at Kansas State University.