Simulation of energy spectrum characteristics of planar CdZnTe detector

BackgroundA CdZnTe (CZT) detector is a compound semiconductor detector with a high atomic number and high detection efficiency, it can be used at room temperatures to detect short wavelength radiation such as X-ray and γ ray.PurposeThis study aims to investigate the factors affecting the energy spectrum characteristics of the CZT detector.MethodsThe geometric model of the detector was established by using Geant4 software, and the intrinsic detection efficiency and absorption rate of CZT crystal in the planar size of 10 cm×10 cm were simulated. The charge collection efficiency of the crystal was calculated using the Hecht formula and the γ-ray energy spectrum was obtained by collecting the deposition energy and position information in the crystal. By analyzing the physical properties of crystals, the impact of physical properties on detector performance was explored.ResultsSimulation results show that incomplete charge collection significantly influences the spectral performance of the detector. When the γ ray