1-D position sensitive single carrier semiconductor detectors

He, Zhong; Knoll, G.F.; Wehe, D.K.; Rojeski, Ronald A.; Mastrangelo, Carlos H.; Hammig, Mark D.; Barrett, Carla L.; Uritani, Akira

doi:10.1016/s0168-9002(96)00352-x

Cited by 130 publications

(52 citation statements)

References 12 publications

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“…The potential of CdZnTe has been demonstrated through many material and detector technology developments over the last decade. [1][2][3][4][5][6][7][8][9][10][11][12][13] The material has the desirable intrinsic properties of a wide bandgap necessary for room-temperature operation and a high average atomic number for efficient gamma-ray stopping. Furthermore, the CdZnTe material that is commercially available today exhibits negligible polarization effects, has a high bulk resistivity, and has reasonably good electron collection properties.…”

Section: Introductionmentioning

confidence: 99%

Electron trapping nonuniformity in high-pressure-Bridgman-grown CdZnTe

Amman

Lee

Luke

2002

Journal of Applied Physics

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Gamma-ray spectroscopy is a valuable tool of science and technology. Many applications for this tool are in need of a detector technology capable of achieving excellent energy resolution and efficient detection while operating at room temperature. Detectors based on the material cadmium zinc telluride (CdZnTe) could potentially meet this need if certain material deficiencies are addressed. The coplanar-grid as well as other electron-only detection techniques are effective in overcoming some of the material problems of CdZnTe and, consequently, have led to efficient gamma-ray detectors with good energy resolution while operating at room temperature. At the present time, the performance of these detectors is mainly limited by the degree of uniformity in electron generation and transport. Despite recent progress in the growth of CdZnTe material, small variations in these properties remain a barrier to the widespread success of such detectors. Alphaparticle response characterization of CdZnTe crystals fabricated into simple planar detectors provides an effective tool to accurately study such variations. We have used a finely collimated alpha source to produce two-dimensional maps of detector response. For a number of crystals, a clear correlation has been observed between their alpha response maps and the distribution of tellurium inclusions inside the crystals. An analysis of the induced charge signals indicates that regions of enhanced electron trapping are associated with the inclusions, and that these regions extend beyond the physical size of the inclusions. Such regions introduce non-uniform electron trapping in the material that then degrades the spectroscopic performance of the material as a gamma-ray detector.2

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Section: Introductionmentioning

confidence: 99%

Electron trapping nonuniformity in high-pressure-Bridgman-grown CdZnTe

Amman

Lee

Luke

2002

Journal of Applied Physics

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“…7,8 In our detector, the anode contact is pixellated and the cathode side faces X-ray sources due to the complex electronics readout systems closely attached to the anode side. For a given X-ray interaction in the detector, the signal gathered by an anode pixel is proportional to the charge induced by the interaction, while the cathode side collects a signal that is proportional to the induced charge times the depth of the interaction.…”

Section: Depth Sensitive Czt Detectormentioning

confidence: 99%

Laboratory coded-aperture imaging experiments: radial hole coded masks and depth-sensitive CZT detectors

et al. 2004

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The proposed black-hole finder mission EXIST will consist of multiple wide-field hard X-ray coded-aperture telescopes. The high science goals set for the mission require innovations in telescope design. In particular, wide energy band coverage and fine angular resolution require relatively thick coded masks and thick detectors compared to their pixel size, which may introduce mask self-collimation and depth-induced image blurring with conventional design approaches. Previously we proposed relatively simple solutions to these potential problems: radial hole for mask selfcollimation and cathode depth sensing detector for image blurring. We have now performed laboratory experiments to explore the potential of these two techniques. The experimental results show that the radial hole mask greatly alleviates mask self-collimation and a ~1 mm resolution depth-sensitive detector scheme can be relatively easily achieved for the large scale required for EXIST.

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“…This requires the corrections for electron trapping that can be handled by adjusting the relative gain in the subtraction circuit of the anode preamplifiers (Luke, 1996;He et al, 1996). In addition, a method using interaction depth sensing to correct for electron trapping in material is employed.…”

Section: Introductionmentioning

confidence: 99%