2-DIMENSIONAL MODELING OF CD(ZN)TE STRIP DETECTORS

Although there has been significant recent progress in the development of CdTe and CdZnTe radiation detectors, these materials are still pla gued by charge trapping and recombination problems. Recent work has sh own that fabrication of arrays with small anodes can overcome these pr oblems to some extent. The purpose of this simulation study was to inv estigate this small anode effect in relatively large strip detectors o f various geometries. Unlike previous simulations, the current study i ncludes the effects of both trapping and detrapping, significant inter -pixel spacing, and non-linear electric field profiles. In addition, t he methods have the potential to account efficiently for spatial varia tions in trapping behavior and for multiple trapping levels. The resul ts of the simulation predict that 8 mm thick strip detectors with 1 mm anode thickness and 0.3 mm anode spacing will provide adequate perfor mance for our medical imaging application.