Noise in CdZnTe detectors

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Noise in CdZnTe devices with different electrode configurations was investigated. Measurements on devices with guard-ring electrode structures showed that surface leakage current does not produce any significant noise. The parallel white noise component of the devices appeared to be generated by the bulk current alone, even though the surface current was substantially higher. This implies that reducing the surface leakage current of a CdZnTe detector may not necessarily result in a significant improvement in noise performance. The noise generated by the bulk current is also observed to be below full shot noise. This partial suppression of shot noise may be ... continued below

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Luke, P. N.; Amman, M.; S., Lee J. & Manfredi, P. F. October 10, 2000.

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Description

Noise in CdZnTe devices with different electrode configurations was investigated. Measurements on devices with guard-ring electrode structures showed that surface leakage current does not produce any significant noise. The parallel white noise component of the devices appeared to be generated by the bulk current alone, even though the surface current was substantially higher. This implies that reducing the surface leakage current of a CdZnTe detector may not necessarily result in a significant improvement in noise performance. The noise generated by the bulk current is also observed to be below full shot noise. This partial suppression of shot noise may be the result of Coulomb interaction between carriers or carrier trapping. Devices with coplanar strip electrodes were observed to produce a 1/f noise term at the preamplifier output. Higher levels of this 1/f noise were observed with decreasing gap widths between electrodes. The level of this 1/f noise appeared to be independent of bias voltage and leakage current but was substantially reduced after certain surface treatments.

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INIS; OSTI as DE00767639

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  • 2000 IEEE Nuclear Science Symposium and Medical Imaging Conference, Lyon (FR), 10/15/2000--10/20/2000

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  • Report No.: LBNL--46915
  • Grant Number: AC03-76SF00098
  • Office of Scientific & Technical Information Report Number: 767639
  • Archival Resource Key: ark:/67531/metadc715263

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  • October 10, 2000

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  • Sept. 29, 2015, 5:31 a.m.

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  • April 4, 2016, 1:45 p.m.

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Luke, P. N.; Amman, M.; S., Lee J. & Manfredi, P. F. Noise in CdZnTe detectors, article, October 10, 2000; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc715263/: accessed August 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.