Modeling charge-sharing effects in pixellated CZT detectors

Abstract

While charge-sharing in pixellated CdZnTe (CZT) room temperature radiation detectors has been studied numerically and experimentally in the last 5-10 years, there are no analytical models that will guide the optimization of CZT detector operations and enable efficient use of the correction algorithms. In this paper, we propose a new analytical model to provide an effective framework to study these effects over a wide range of detector geometries, biasing conditions, and material properties. The proposed model correctly predicts the amount of charge-sharing events versus photon energy and detector pixel size which are confirmed experimentally and numerically at the Danish National Space Center.