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Effects of dislocations and sub-grain boundaries on X-ray response maps of CdZnTe radiation detectors

  • A. Hossain (a1), A. E. Bolotnikov (a1), G. S. Camarda (a1), Y. Cui (a1), R. Gul (a1), K. Kim (a1), B. Raghothamachar (a2), G. Yang (a1) and R. B. James (a1)...

Abstract

The imperfect quality of CdZnTe (CZT) crystals for radiation detectors seriously diminishes their suitability for different applications. Dislocations and other dislocation-related defects, such as sub-grain boundaries and dislocation fields around Te inclusions, engender significant charge losses and, consequently, cause fluctuations in the detector’s output signals, thereby hindering their spectroscopic responses. In this paper, we discuss our results from characterizing CZT material by using a high-spatial-resolution X-ray response mapping system at BNL’s National Synchrotron Light Source. In this paper, we emphasize the roles of these dislocation-related defects and their contributions in degrading the detector’s performance. Specifically, we compare the effects of the sub-grain- and coherent twin-boundaries on the X-ray response maps.

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1. Bolotnikov, A. E., Babalola, S., Camarda, G. S., Cui, Y., Gul, R., Egarievwe, S. U., Fochuk, P. M., Fuerstnau, M., Hossain, A., Jones, F., Kim, K. H., Kopach, O. V., Marchini, L., Raghothamachar, B., Taggart, R., Yang, G., Xu, L., and James, R. B., “Correlations between crystal defects and performance of CdZnTe detectors”, accepted for IEEE Trans. Nucl. Sci., NS, 2011.
2. Saucedo, E., Rudolph, P. and Dieguez, E., J. Cryst. Growth 310, p. 2067, 2008.
3. Carini, G. A., Bolotnikov, A. E., Camarda, G. S., Wright, G. W., Li, L., and James, R. B., “Effect of Te inclusions on the performance of CdZnTe detectors", Appl. Phys. Lett. 88, p.143515, 2006.
4. Camarda, G. S., Bolotnikov, A. E., Carini, G. A., and James, R. B., “Effects of Tellurium inclusions on charge collection in CZT Nuclear Radiation Detectors”, in Countering Nuclear and Radiological Terrorism, edited by Aprkyan, S. and Diamond, D., Springer, 2006, pp. 199207.
5. Camarda, G. S., Abdul-Jabbar, N. M., Babalola, S., Bolotnikov, A. E., Cui, Y., Hossain, A., Jackson, E., Jackson, H., James, J. R., Luryi, A. L., Groza, M., Burger, A., and James, R. B., “Characterization and Measurements of CZT Material: Novel Techniques and Results”, in Proceedings of SPIE Hard X-Ray and Gamma-Ray Detector Physics IX, Vol. 6706, edited by James, R. B., Burger, A. and Franks, L. A. (SPIE, Bellingham, WA, 2007), 670605.
6. Bolotnikov, A. E., Camarda, G. S., Cui, Y., Hossain, A., Yang, G., Yao, H. W., and James, R. B., “Internal electric-field-lines distribution in CdZnTe detectors measured using X-ray mapping”, IEEE Trans. Nucl. Sci., NS 56, n. 3, pp. 791794, 2009.
7. Hossain, A., Bolotnikov, A. E., Camarda, G. S., Cui, Y., Yang, G., and James, R. B., Defects in cadmium zinc telluride crystals revealed by etch-pit distributions, Journal of Crystal Growth 310 (2008) 44934498.

Keywords

Effects of dislocations and sub-grain boundaries on X-ray response maps of CdZnTe radiation detectors

  • A. Hossain (a1), A. E. Bolotnikov (a1), G. S. Camarda (a1), Y. Cui (a1), R. Gul (a1), K. Kim (a1), B. Raghothamachar (a2), G. Yang (a1) and R. B. James (a1)...

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