Cadmium zinc telluride explained

Cadmium zinc telluride, (CdZnTe) or CZT, is a compound of cadmium, zinc and tellurium or, more strictly speaking, an alloy of cadmium telluride and zinc telluride. A direct bandgap semiconductor, it is used in a variety of applications, including semiconductor radiation detectors, photorefractive gratings, electro-optic modulators, solar cells, and terahertz generation and detection. The band gap varies from approximately 1.4 to 2.2 eV, depending on composition.[1]

Characteristics

Radiation detectors using CZT can operate in direct-conversion (or photoconductive) mode at room temperature, unlike some other materials (particularly germanium) which require cooling. Their relative advantages include high sensitivity for X-rays and gamma rays, due to the high atomic numbers of Cd and Te, and better energy resolution than scintillator detectors.[2] CZT can be formed into different shapes for different radiation-detecting applications, and a variety of electrode geometries, such as coplanar grids [3] and small pixel detectors,[4] have been developed to provide unipolar (electron-only) operation, thereby improving energy resolution. A 1 cm3 CZT crystal has a sensitivity range of 30 keV to 3 MeV with a 2.5% FWHM energy resolution at 662 keV.[5] Pixelated CZT with a volume of 6 cm3 can achieve 0.71% FWHM energy resolution at 662 keV and perform Compton imaging.[6]

See also

External links

Notes and References

  1. Book: Peter . Capper . Properties of Narrow Gap Cadmium-based Compounds . 618 . INSPEC . 0-85296-880-9 . 1994.
  2. Small pixel CZT detector for hard X-ray spectroscopy. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment . 10.1016/j.nima.2011.01.144 . 652. 158–161. 2011 . Wilson . Matthew David . Cernik . Robert . Chen . Henry . Hansson . Conny . Iniewski . Kris . Jones . Lawrence L. . Seller . Paul . Veale . Matthew C. . 1 . 2011NIMPA.652..158W .
  3. 1995. Unipolar charge sensing with coplanar electrodes -- application to semiconductor detectors. IEEE Transactions on Nuclear Science. 42. 4. 207–213. 10.1109/23.467848. Luke. P.N.. 1995ITNS...42..207L . 64754800 .
  4. Pixellated Cd(Zn)Te high-energy X-ray instrument. Journal of Instrumentation. 10.1088/1748-0221/6/12/C12009 . 22737179 . 6. 12 . C12009. 3378031. 2011 . Seller . P. . Bell . S. . Cernik . R. J. . Christodoulou . C. . Egan . C. K. . Gaskin . J. A. . Jacques . S. . Pani . S. . Ramsey . B. D. . Reid . C. . Sellin . P. J. . Scuffham . J. W. . Speller . R. D. . Wilson . M. D. . Veale . M. C. . 2011JInst...6C2009S.
  5. Yannick . Verbelen . Peter G. . Martin . Kamran . Ahmad . Suresh . Kaluvan . Thomas B. . Scott . Miniaturised Low-Cost Gamma Scanning Platform for Contamination Identification, Localisation and Characterisation: A New Instrument in the Decommissioning Toolkit . 10.3390/s21082884 . 8074328 . free . Sensors . 21 . 8 . 2021. 2884 . 33924123 . 2021Senso..21.2884V .
  6. Feng. Zhang . Cedric . Herman . Zhong . He . Gianluigi . De Geronimo . Emerson . Vernon . Jack . Fried . Characterization of the H3D ASIC Readout System and 6.0 cm³ 3-D Position Sensitive CdZnTe Detectors . IEEE Transactions on Nuclear Science . 59 . 1 . 2012. 236 . 10.1109/TNS.2011.2175948 . 2012ITNS...59..236Z . 16381112 .

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