In this follow up characterization study of Redlen High-Flux Cadmium Zinc Telluride (HF-CZT), carried out as a collaboration between IMEM-CNR and the ESRF, we demonstrate the linearity of the photocurrent with incident X-ray flux up to 6×10 +11 photons.mm -2 .s -1 . We also carry out an in depth study of the aftersignal as a function of incident X-ray flux as well as irradiation duration, with a microsecond time resolution. From this study we demonstrate that the aftersignal has a characteristic undershoot, the amplitude of which is linear with both the incident X-ray flux and the irradiation duration. However, the ratio between instantaneous aftersignal and corresponding photocurrent decreases with incident X-ray flux from 3% at the lowest flux, to 0.05%, at the highest flux. The aftersignal is demonstrated to go back to the baseline in the seconds time range. This paves the way for the use of HF-CZT in new generation of detectors for 4 th generation synchrotrons.
Linearity and aftersignal of High-Flux CdZnTe with optimized electrodes for X-ray detectors
Bettelli, M.;Zanettini, S.;Zappettini, A.
2023
Abstract
In this follow up characterization study of Redlen High-Flux Cadmium Zinc Telluride (HF-CZT), carried out as a collaboration between IMEM-CNR and the ESRF, we demonstrate the linearity of the photocurrent with incident X-ray flux up to 6×10 +11 photons.mm -2 .s -1 . We also carry out an in depth study of the aftersignal as a function of incident X-ray flux as well as irradiation duration, with a microsecond time resolution. From this study we demonstrate that the aftersignal has a characteristic undershoot, the amplitude of which is linear with both the incident X-ray flux and the irradiation duration. However, the ratio between instantaneous aftersignal and corresponding photocurrent decreases with incident X-ray flux from 3% at the lowest flux, to 0.05%, at the highest flux. The aftersignal is demonstrated to go back to the baseline in the seconds time range. This paves the way for the use of HF-CZT in new generation of detectors for 4 th generation synchrotrons.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
