The CZT Ring-drift detector: A novel concept for hard X-ray detection

Hartog, R. den; Owens, A.; Kozorezov, A. G.; Wigmore, J. K.; Gostilo, V.; Loupilov, À.; Kondratjev, V.; Webb, Mark; Welter, Edmund

doi:10.1109/nssmic.2007.4437284

Cited by 3 publications

(6 citation statements)

References 11 publications

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“…This drift ring technique was first proposed by Gatti and Rehak in 1983 [23] for Si detectors. In 1998, Pamelen and Budtz-Jørgensen of the Danish Space Research Institute demonstrated the potential of CZT drift strip detectors for X-ray astronomy applications [11,12]. We have previously presented results from a 1 mm thick CdTe drift ring detector with Ohmic contacts at room temperature [24], which suffered from relatively high leakage current limiting the bias that could be applied.…”

Section: Jinst 10 P04005mentioning

confidence: 99%

“…These limitations of Si and HPGe detectors have directed efforts to investigate compound semiconductor based detectors, such as CdTe and CZT, which are considered an excellent choice for room temperature gamma-ray spectroscopy due to their good quantum efficiencies at high energies [1], [10]. However, the effect of poor hole transport in CdTe and CZT detectors (hole mobility life time product, µτ, are 10 -4 and 10 -5 cm 2 /V in CdTe and CZT respectively, in comparison to 1 cm 2 /V in Si and Ge detectors [1]) in some cases represents a critical limitation causing low energy tailing in the spectrum degrading the detector energy resolution especially at high energies [3], [6], [11], [12]. Many techniques have been proposed to overcome the problem of poor hole transport.…”

Section: Introductionmentioning

confidence: 99%

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Development of a CZT drift ring detector for X and γ ray spectroscopy

Alruhaili¹,

Sellin²,

Lohstroh³

et al. 2015

J. Inst.

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CdTe and CZT detectors are considered better choices for high energy γ and X-ray spectroscopy in comparison to Si and HPGe detectors due to their good quantum efficiency and room temperature operation. The performance limitations in CdTe and CZT detectors are mainly associated with poor hole transport and trapping phenomena. Among many techniques that can be used to eliminate the effect of the poor charge transport properties of holes in CdTe and CZT material, the drift ring technique shows promising results. In this work, the performance of a 2.3 mm thick CZT drift ring detector is investigated. Spatially resolved measurements were carried out with an X-ray microbeam (25 and 75 KeV) at the Diamond Light Source synchrotron to study the response uniformity and extent of the active area. Higher energy photon irradiation was also carried out at up to 662 keV using different radioisotopes to complement the microbeam data. Different biasing schemes were investigated in terms of biasing the cathode rear electrode (bulk field) and the ring electrodes (lateral fields). The results show that increasing the bulk field with fixed-ratio ring biases and lateral fields with fixed bulk fields increase the active area of the device significantly, which contrasts with previous studies in CdTe, where only an increasing lateral field resulted in an improvement of device performance. This difference is attributed to the larger thickness of the CZT device reported here.

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Section: Jinst 10 P04005mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Development of a CZT drift ring detector for X and γ ray spectroscopy

Alruhaili¹,

Sellin²,

Lohstroh³

et al. 2015

J. Inst.

View full text Add to dashboard Cite

show abstract

“…Planar compound semiconductor based detectors are considered an excellent choice for room temperature gamma ray spectroscopy systems due to their good quantum efficiencies in comparison to Si at high energy [1]. However, the effect of poor hole transport in these materials in some cases represents a critical limitation causing low energy tailing in the spectrum degrading the detector energy resolution [2,3]. Many techniques exist to overcome the problem of poor hole transport, these include, signal processing, novel electrode geometries or a combination of both.…”

mentioning

confidence: 99%

“…Novel electrode geometries, such as the Co-planar grid technique, are associated with increased electronic noise due to the leakage currents between the grid electrodes [3]. The drift ring technique is an alternative detector geometry that reduces the sensitivity to hole transport, improving the detector energy resolution, without rejecting any events [2,3]. This drift ring technique was first proposed by Gatti and Rehak in 1983 [5] for Si detectors and these are now used extensively for very high resolution X-ray spectroscopy, however, these detectors suffer from poor quantum efficiency at higher energies [5,6].…”

mentioning

confidence: 99%

“…This drift ring technique was first proposed by Gatti and Rehak in 1983 [5] for Si detectors and these are now used extensively for very high resolution X-ray spectroscopy, however, these detectors suffer from poor quantum efficiency at higher energies [5,6]. In 1998, Pamelen and Budtz-Jørgensen [2,3] of the Danish Space Research Institute demonstrated the potential of CdZnTe drift strip detectors for X-ray astronomy applications. In this paper the first results on a prototype CdTe-based drift ring detector are presented.…”

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confidence: 99%

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Performance characteristics of CdTe drift ring detector

Alruhaili¹,

Sellin²,

Lohstroh³

et al. 2014

J. Inst.

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CdTe and CdZnTe material is an excellent candidate for the fabrication of high energy X-ray spectroscopic detectors due to their good quantum efficiency and room temperature operation. The main material limitation is associated with the poor charge transport properties of holes. The motivation of this work is to investigate the performance characteristics of a detector fabricated with a drift ring geometry that is insensitive to the transport of holes. The performance of a prototype Ohmic CdTe drift ring detector fabricated by Acrorad with 3 drift rings is reported; measurements include room temperature current voltage characteristics (IV) and spectroscopic performance. The data shows that the energy resolution of the detector is limited by leakage current which is a combination of bulk and surface leakage currents. The energy resolution was studied as a function of incident X-ray position with a X-ray microbeam at the Diamond Light Source. Different ring biasing schemes were investigated and the results show that by increasing the lateral field (i.e. the bias gradient across the rings) the active area, evaluated by the detected count rate, increased significantly.

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Investigation of the Influence of Infrared Illumination on the Pulse Shapes of Output Signals of CdZnTe Detectors

Ivanov,

Fjodorovs,

Hinoverovs

et al. 2023

Sensors

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The spectrometric characteristics of CdZnTe detectors are largely determined by the nonuniformity of the material and the influence of the negative polarization effects associated with the formation of space charges in the sensitive volume of the detector. They change the electric field distribution in the detector and affect the efficiency of the charge carrier collection. An analysis of the waveforms of the output pulses was used to investigate the uniformity of the charge collection and electric field distribution in the detectors when irradiated by the alpha particles. The influence of infrared (IR) illumination on these parameters was evaluated. IR illumination had no positive effect on the planar detector but greatly improved the charge collection in quasi-hemispherical detectors in the peripheral (corner) regions. The output pulse amplitude increased, and the rise time notably decreased. Polarization that occurred predominantly in the corner regions at low temperatures (from −30 °C to −20 °C) was eliminated using IR illumination.

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The CZT Ring-drift detector: A novel concept for hard X-ray detection

Cited by 3 publications

References 11 publications

Development of a CZT drift ring detector for X and γ ray spectroscopy

Development of a CZT drift ring detector for X and γ ray spectroscopy

Performance characteristics of CdTe drift ring detector

Investigation of the Influence of Infrared Illumination on the Pulse Shapes of Output Signals of CdZnTe Detectors

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