The effects of Te precipitates on measurable characteristics of CdZnTe detectors

A. E. Bolotnikov; M. Black; G. S. Camarda; G. A. Carini; Y. Cui; K. T. Kohman; L. Li; M. B. Salomon; R. B. James

doi:10.1117/12.682715

11 September 2006 The effects of Te precipitates on measurable characteristics of CdZnTe detectors

A. E. Bolotnikov, M. Black, G. S. Camarda, G. A. Carini, Y. Cui, K. T. Kohman, L. Li, M. B. Salomon, R. B. James

Proceedings Volume 6319, Hard X-Ray and Gamma-Ray Detector Physics and Penetrating Radiation Systems VIII; 631903 (2006) https://doi.org/10.1117/12.682715
Event: SPIE Optics + Photonics, 2006, San Diego, California, United States

Abstract

The effects of Te precipitates on the performances of CdZnTe nuclear radiation detectors were investigated with wide X-ray or alpha-particle beams. In these measurements, the degradations in the device performances were correlated with the areas of high concentrations of Te precipitates aggregated around the crystalline defects or with large-size (>100 μm) individual precipitates. The critical role of the small-size, 1-20 μm in diameter, precipitates was not clearly established, because of the large size of the particle beams used in prior studies (300-400-μm diameter). Our recent measurements conducted with a highly collimated, <10 μm, x-ray beam and thin, ~1 mm, CZT crystals proved that even a single small-size precipitate affects the local charge transport properties in CdZnTe detectors. The next step is to determine the extent of the potential cumulative effect of randomly distributed Te precipitates on the properties of CZT detectors. In this work, we report on the modeling of the effects of Te precipitates on measurable characteristics such as energy resolution, detection efficiency, electron mobility-lifetime product, and others and compare with the experimental results.

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A. E. Bolotnikov, M. Black, G. S. Camarda, G. A. Carini, Y. Cui, K. T. Kohman, L. Li, M. B. Salomon, and R. B. James "The effects of Te precipitates on measurable characteristics of CdZnTe detectors", Proc. SPIE 6319, Hard X-Ray and Gamma-Ray Detector Physics and Penetrating Radiation Systems VIII, 631903 (11 September 2006); https://doi.org/10.1117/12.682715

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