Using a pulsed laser beam to investigate the feasibility of sub-pixel position resolution with time-correlated transient signals in 3D pixelated CdZnTe detectors

Giraldo, L. Ocampo; Bolotnikov, A. E.; Camarda, G. S.; Cheng, Shaobo; Geronimo, G. De; McGilloway, A.; Fried, J.; Hodges, Deidra; Hossain, Anwar; Ünlü, Kenan; Petryk, M.; Vidal, Vladimir; Vernon, E.; Yang, Ge; James, R. B.

doi:10.1016/j.nima.2017.04.030

Cited by 5 publications

(3 citation statements)

References 12 publications

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“…Convenient methods to study the charge dynamics including the polarization phenomena in biased detectors are the transient charge technique (TChT) [ 14 ], transient current technique (TCT) [ 15 ], and laser-induced transient current technique (L-TCT) [ 16 , 17 , 18 , 19 ]. Among these, the L-TCT excited with the above-bandgap laser pulses has several advantages.…”

Section: Introductionmentioning

confidence: 99%

In and Al Schottky Contacts Comparison on P-Type Chlorine-Doped CdTe

Vasylchenko

Grill

Betušiak

et al. 2021

Sensors

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The performance of the CdTe radiation detectors heavily relies on the method of contact preparation. A convenient research method addressing this problem is the laser-induced transient current technique. In this paper, we compare the performance of two CdTe crystals which underwent different metallization processes. We showed that appropriately designed Au/Al contacts induce much less bulk polarization than commercial Pt/In electrodes under the same working conditions and can thus provide a convenient alternative to the industry standard. The comparison was based on the monitoring of the time-dependent sensor polarization measuring transient currents excited by above-bandgap laser illumination complemented by the Am 241 gamma spectroscopy. The theoretical analysis of current waveforms and radiation spectra enabled us to determine the charge carrier mobility, mobility-lifetime products of electrons and holes, and temporal and bias dependence of the space charge formation.

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Section: Introductionmentioning

confidence: 99%

In and Al Schottky Contacts Comparison on P-Type Chlorine-Doped CdTe

Vasylchenko

Grill

Betušiak

et al. 2021

Sensors

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“…Iniewski et al [17] modeled this situation using diffusion and charge repulsion mechanisms. Giraldo et al [18] studied the charge sharing phenomenon in order to enhance the spatial resolution of the (CdZn)Te pixel detector by means of transient charge technique (TChT). In general, the charge sharing has also been studied previously analytically and numerically [18][19][20], yet the exact dependence of signal formation on charge sharing is still questionable.…”

Section: Introductionmentioning

confidence: 99%

“…Giraldo et al [18] studied the charge sharing phenomenon in order to enhance the spatial resolution of the (CdZn)Te pixel detector by means of transient charge technique (TChT). In general, the charge sharing has also been studied previously analytically and numerically [18][19][20], yet the exact dependence of signal formation on charge sharing is still questionable. Recently, the transient current technique (TCT) became a standard method of measuring induced signal and characterizing the charge transport in bulk [19,20] and thin films [21].…”

Section: Introductionmentioning

confidence: 99%

Charge Sharing in (CdZn)Te Pixel Detector Characterized by Laser-Induced Transient Currents

Vasylchenko

Grill

Belas

et al. 2019

Sensors

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Performance of the (CdZn)Te pixelated detectors heavily relies on the quality of the underlying material. Modern laser-induced transient current technique addresses this problem as a convenient tool for characterizing the associated charge distribution. In this paper, we investigated the charge sharing phenomenon in (CdZn)Te pixel detector as a function of the charge collected on adjacent pixels. The current transients were generated in the defined 4 mm 2 spots using 660 nm laser illumination. Waveforms measured on the pixel of interest and its surroundings were used to build the maps of the collected charge at different biases. The detailed study of the maps allowed us to distinguish the charge sharing region, the region with a defect, and the finest part in terms of the performance part of the pixelated anode. We observed the principal inhomogeneity complicating the assignment of the illuminated spot to the nearest pixel.Sensors 2020, 20, 85 2 of 14 particular design if wired in a form of a virtual coplanar grid. These detectors are featured by specific electrode configurations that in general provide a particular distribution of electric field inside the sample. According to Shockley-Ramo theorem [13], these field effects induce signal as follows:

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