Passivation effect on large volume CdZnTe crystals
0
조회
0
다운로드
3
인용
0
참고문헌
키워드
초록
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.
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.
참고문헌 (16)
- R. B. James, "Semiconductors and Semimetals Semiconductors for Room Temperature Nuclear Detector Applications" (1995), Elsevier
- A. J. Nelson, "Study of surface passivation and Contact Deposition Techniques in CdZnTe XRay and gamma-ray detectors", Froc. MRS, 1038 (2008)
- S. U. Egarievwe, "Effects of chemical treatments on CdZnTe X-ray and gamma-ray detectors", IEEE Trans. Nucl. Sci, 63, pp.1091~ (2016)[DOI]
- G. W. Wright, "Evaluation of NH4F", H2O2 effectiveness as a surface passivation agent for Cd1"xZnxTe crystals, 2000, pp.4141, 324~
- S. U. Egarievwe, "Ammonium fluoride passivation of CdZnTeSe sensors for applications in nuclear detection and medical imaging", Sensors, 19, pp.3271~ (2019)[DOI]
- L. Marchini, "Study of surface treatment effects on the metal-CdZnTe interface", IEEE Trans. Nucl. Sci, 56, pp.1823~ (2009)[DOI]
- K. H. Kim, "Effective surface passivation of CdMnTe materials", J. Electron. Mater, 39, pp.1015~ (2010)[DOI]
- 김기현, "Long-term Stability of Ammonium-sulfide- and Ammonium-fluoride-passivated CdMnTe Detectors", Journal of the Korean Physical Society, 66(10), pp.1532~1536 (2015), 한국물리학회
- D. E. Jones, "Study of surface passivation and Contact Deposition Techniques in CdZnTe XRay and gamma-ray detectors", IEEE. Nucl. Sci. Conf. R, pp.4124~ (2012)[DOI]
- 김선웅, "Passivation of Semi-Insulating Polycrystaline CdZnTe Films", Journal of the Korean Physical Society, 53(1), pp.317~321 (2008), 한국물리학회
- K. H. Kim, "Improved carrier-transport properties of passivated CdMnTe crystals", J. Appl. Phys, 105, pp.093705~ (2009)[DOI]
- K. T. Chen, "Study of oxidized cadmium zinc telluride surfaces", J. Vac. Sci. Technol. A, 15, pp.850~ (1997)[DOI]
- S. J. Hwang, "Anomalous Te inclusion size and distribution in CdZnTeSe", IEEE Trans. Nucl. Sci, 66, pp.2329~ (2019)[DOI]
- Y. Cui, "Study of surface recombination velocity of Cd1"xZnxTe radiation detectors by direct current photoconductivity", J. Appl. Phys, 92(5), pp.2556~ (2002)[DOI]
- Y. Eisen, "Correction of incomplete charge collection in CdTe detectors", Nucl. Instrum. Meth. A, 353, pp.60~ (1994)[DOI]