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http://dx.doi.org/10.1016/j.net.2022.06.005

Passivation effect on large volume CdZnTe crystals  

B. Park (Dept. of Health and Safety Convergence Science, Korea University)
Y. Kim (Interdisciplinary Program in Precision Public Health, Korea University)
J. Seo (Dept. of Health and Safety Convergence Science, Korea University)
J. Byun (Dept. of Health and Safety Convergence Science, Korea University)
K. Kim (School of Health and Environmental Science, Korea University)
Publication Information
Nuclear Engineering and Technology / v.54, no.12, 2022 , pp. 4620-4624 More about this Journal
Abstract
Several cadmium zinc telluride (CZT) crystals were fabricated into radiation detectors using methods that included slicing, dicing, lapping, polishing, and chemical etching. A wet passivation with sodium hypochlorite (NaOCl) was then carried out on the Br-etched detectors. The Te-rich layer on the CZT surface was successfully compensated to the Te oxide layer, which was analyzed with X-ray photoelectron spectroscopy data of both a Br-etched crystal and a passivated CZT crystals. We confirmed that passivation with NaOCl improved the transport property by analyzing the mobility-lifetime product and surface recombination velocity. The electrical and spectroscopic properties of large volume detectors were compared before and after passivation, and then the detectors were observed for a month. Both bar and quasi-hemispherical detectors show an enhancement in performance after passivation. Thus, we could identify the effect of NaOCl passivation on large volume CZT detectors.
Keywords
Passivation; Sodium hypochlorite; CdZnTe detector; Surface recombination velocity;
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Times Cited By KSCI : 1  (Citation Analysis)
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1 K. Kim, J.H. Won, S.H. Cho, J.H. Suh, P.K. Cho, J. Hong, Y.R. Han, S.U. Kim, Passivation of semi-insulating polycrystalline CdZnTe films, J. Korean Phys. Soc. 53 (1) (2008) 317, https://doi.org/10.3938/jkps.53.317.   DOI
2 K.H. Kim, G.S. Camarda, A.E. Bolotnikov, R.B. James, J. Hong, S. Kim, Improved carrier-transport properties of passivated CdMnTe crystals, J. Appl. Phys. 105 (2009), 093705, https://doi.org/10.1063/1.3121502.   DOI
3 K.T. Chen, D.T. Shi, H. Chen, B. Granderson, M.A. George, W.E. Collins, A. Burger, Study of oxidized cadmium zinc telluride surfaces, J. Vac. Sci. Technol. A. 15 (1997) 850, https://doi.org/10.1116/1.580719.   DOI
4 S.J. Hwang, H.S. Yu, A.E. Bolotnikov, R.B. James, K.H. Kim, Anomalous Te inclusion size and distribution in CdZnTeSe, IEEE Trans. Nucl. Sci. 66 (2019) 2329, https://doi.org/10.1109/TNS.2019.2944969.   DOI
5 Y. Cui, M. Groza, D. Hillman, A. Burger, R.B. James, Study of surface recombination velocity of Cd1-xZnxTe radiation detectors by direct current photoconductivity, J. Appl. Phys. 92 (5) (2002) 2556, https://doi.org/10.1063/1.1497696.   DOI
6 http://srdata.nist.gov/xps/.
7 Y. Eisen, Y. Horovitz, Correction of incomplete charge collection in CdTe detectors, Nucl. Instrum. Meth. A. 353 (1994) 60, https://doi.org/10.1016/0168-9002(94)91603-9.   DOI
8 R.B. James, T.E. Schlesinger, J. Lund, M. Schieber, Semiconductors and Semimetals Semiconductors for Room Temperature Nuclear Detector Applications, Elsevier, New York, 1995.
9 A.J. Nelson, A.M. Conway, C.E. Reinhardt, J.L. Ferreira, R.J. Nikolic, S.A. Payne, Study of surface passivation and Contact Deposition Techniques in CdZnTe X-Ray and gamma-ray detectors, Froc. MRS. 1038 (2008), https://doi.org/10.1109/NSSMIC.2012.6551942.   DOI
10 S.U. Egarievwe, A. Hossain, I.O. Okwechime, A.A. Egarievwe, D.E. Jones, U.N. Roy, R.B. James, Effects of chemical treatments on CdZnTe X-ray and gamma-ray detectors, IEEE Trans. Nucl. Sci. 63 (2016) 1091, https://doi.org/10.1109/TNS.2016.2527779.   DOI
11 G.W. Wright, R.B. James, D. Chinn, B.A. Brunett, R.W. Olsen, J. Van Scyoc, M. Clift, A. Burger, K. Chattopadhyay, D. Shi, R. Wingfield, Evaluation of NH4F/H2O2 effectiveness as a surface passivation agent for Cd1-xZnxTe crystals, Proc. SPIE 4141 (2000) 324, https://doi.org/10.1117/12.407594.   DOI
12 S.U. Egarievwe, U.N. Roy, C.A. Goree, B.A. Harrison, J. Jones, R.B. James, Ammonium fluoride passivation of CdZnTeSe sensors for applications in nuclear detection and medical imaging, Sensors 19 (2019) 3271, https://doi.org/10.3390/s19153271.   DOI
13 L. Marchini, A. Zappettini, E. Gombia, R. Mosca, M. Pavesi, Study of surface treatment effects on the metal-CdZnTe interface, IEEE Trans. Nucl. Sci. 56 (2009) 1823, https://doi.org/10.1109/TNS.2009.2022831.   DOI
14 K.H. Kim, V. Carcelen, A.E. Bolotnikov, G.S. Camarda, R. Gul, A. Hossain, G. Yang, Y. Cui, R.B. James, Effective surface passivation of CdMnTe materials, J. Electron. Mater. 39 (2010) 1015, https://doi.org/10.1007/s11664-010-1090-y.   DOI
15 K.H. Kim, R. Tappero, A.E. Bolotinikov, A. Hossain, G. Yang, R.B. James, P. Fochuk, Long-term stability of ammonium-sulfide-and ammonium-fluoride-passivated CdMnTe detectors, J. Korean Phys. Soc. 66 (2015) 1532, https://doi.org/10.3938/jkps.66.1532.   DOI
16 D.E. Jones, S.U. Egarievwe, A. Hossain, I.O. Okwechime, M.L. Drabo, J. Hall, A.L. Adams, S.O. Babalola, G.S. Camarda, A.E. Bolotnikov, W. Chan, R.B. James, Study of surface passivation and Contact Deposition Techniques in CdZnTe X-Ray and gamma-ray detectors, IEEE. Nucl. Sci. Conf. R. (2012) 4124, https://doi.org/10.1109/NSSMIC.2012.6551942.   DOI