Model calculations of the response of CZT strip detectors

Emrah Kalemci; James L. Matteson; Robert T. Skelton; Paul L. Hink; Kimberly R. Slavis

doi:10.1117/12.366601

19 October 1999 Model calculations of the response of CZT strip detectors

Emrah Kalemci, James L. Matteson, Robert T. Skelton, Paul L. Hink, Kimberly R. Slavis

Proceedings Volume 3768, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics; (1999) https://doi.org/10.1117/12.366601
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1999, Denver, CO, United States

Abstract

Position-sensitive CZT detectors for research in astrophysics in the five - several hundred keV range are being developed by several groups. These are very promising for large area detector arrays in coded mask imagers and small-area focal plane detectors for focusing x-ray telescopes. We have developed detectors with crossed-strip readout and optimized strip widths and gaps to improve energy resolution. A 'steering electrode' is employed between the anode strips to improve charge collection. A model of charge drift in the detectors and charge induction on the electrodes has been developed to allow us to better understand these types of detectors and improve their design. The model presently accounts for the electric field within the detector, the charges' trajectories, mobility and trapping of holes and electrons, and charge induction on all electrodes including their time dependence. Additional effects are being added. The model is described and its predictions are compared with laboratory measurements. Results include (1) the dependence of anode, cathode and steering electrode signal on interaction depth, transverse position, electron and hole trapping, strip width and gap, and bias, (2) trajectories of charges for various anode and steering electrode bias voltages, (3) a method to improve energy resolution by sign depth of interaction information, and (4) an electrode geometry and bias optimized for the improved energy resolution. In general, the model provides good agreement with the measurements.

Citation Download Citation

Emrah Kalemci, James L. Matteson, Robert T. Skelton, Paul L. Hink, and Kimberly R. Slavis "Model calculations of the response of CZT strip detectors", Proc. SPIE 3768, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics, (19 October 1999); https://doi.org/10.1117/12.366601

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