Multidimensional characterization of cadmium-zinc-telluride coplanar-grid detectors

The energy resolution of a γ-ray detector describes its ability to separate radioactive nuclides with nearly identical energy. Several constants like crystal quality and preamplifier noise as well as a couple of variables influence this crucial figure. Usually a trade-off between charge loss and bias voltage induced noise has to be made in planar devices, while more complex electrode structures like coplanar grids offer additional parameters that have to be optimized for ideal detector performance. In this paper we present a method that quickly converges towards the best energy resolution of a detector with a given set of parameters.