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- W2577018051 abstract "Cadmium Zinc Telluride is increasingly popular as a detector of X-rays at room temperature. The limiting factor in its performance is poor hole mobility causing low-energy `tailing' on peaks. Ring-Drift is a low-noise, single-carrier-sensing configuration that is the gold standardfor spectroscopic silicon X-ray detectors. Combining the advantages of Ring-Drift geometry with the e�fficiency of CZT could lead to a simple, compact, low-cost system for spectroscopy of hard X-rays with the potential for smaller energy resolution than any such systems currentlyavailable. There has been very little research on CZT Ring-Drift devices as yet.In this project, a prototype 3-ring drift detector of 7.5mm diameter� x 2.3mm was characterised at room temperature with X- and gamma-ray sources of 60-662keV and by microbeamscanning while the voltages applied to all electrodes were systematically varied. Results showed the crucial influence of the lateral field and its ratio to the bulk field upon the active area, peak position and sensitivity. No hole tailing occurred at 78keV. The maximum active radius extended to 2.3mm, beyond the second ring. The leakage current was very low but energy resolution was limited by preamplifier noise. The CZT material and the device geometry were modelled in 3D with Synopsys SentaurusTCAD. Line scans were simulated and trends in performance with bias conditions matched experimental data but the model was more severely affected by charge sharing than the real device. The model detector was modified in pursuit of optimum performance. The parameters investigated were ring number, width, pitch and position, combinations of applied voltages and the segmentation of the plane cathode into drift rings. Fields and charge drift were visualised and the active volume was mapped in 3D to improve understanding of the factors governing sensitivity, energy registration and energy resolution. It was concluded that there is no single optimum geometry and bias scheme, but a versatile configuration and a set of different voltage combinations that would perform optimally for different interaction depths." @default.
- W2577018051 created "2017-01-26" @default.
- W2577018051 creator A5089744617 @default.
- W2577018051 date "2016-11-21" @default.
- W2577018051 modified "2023-09-26" @default.
- W2577018051 title "CZT ring-drift detectors for hard x-ray spectroscopy : an investigation of design by experiment and modelling." @default.
- W2577018051 hasPublicationYear "2016" @default.
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