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Studies on Cr electrode of CdZnTe detector for high energy radiation detection

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Abstract

Electrode with proper contact properties is of vital importance to CdZnTe detector for high energy radiation detection. In this work, Au and Cr electrodes are prepared on CdZnTe surface using magnetron sputtering method. The surface morphology and the interface structure are analyzed using atomic force microscopy and X-ray photoelectron spectroscopy (XPS). No reaction is found at Au/CZT interface. But for Cr/CdZnTe, interface layers of CrO and Te were found, which forms a structure of Cr/Cr–O/Te/CdZnTe with a metal-insulator-metal tunnel junction. Due to this interface structure, Schottky Barrier height was tuned, which enhanced the collection efficiency and energy resolution for high energy irradiation. The energy resolution of CdZnTe detector with Cr electrode for 137Cs isotope with the energy of 662 keV reaches about 1.3%. The adhesive force of Cr is also enhanced because of the interface reaction. The results prove Cr to be a proper electrode material for CdZnTe detectors.

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Acknowledgements

This work was supported by the National Key Research and Development Program of China (2016YFF0101301, 2016YFF0101305), the National Natural Science Foundation of China (51672216, 51372205, 51502244) and the Central Universities Fundamental Research Foundation (3102015BJ(II)ZS014). The project was also supported by funds from the State Key Laboratory of Solidification Processing in NWPU (SKLSP201219). The authors are grateful to all of the members of Imdetek Co., Ltd for their help with the experiments.

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Authors and Affiliations

  1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an, 710072, People’s Republic of China

    Shouzhi Xi, Wanqi Jie, Tao Wang, Gangqiang Zha, Aoqiu Wang, Hui Yu, Lingyan Xu, Boru Zhou, Fan Yang, Yadong Xu & Yaxu Gu

  2. Key Laboratory of Radiation Detection Materials and Devices, Ministry of Industry and Information Technology, Xi’an, 710072, People’s Republic of China

    Shouzhi Xi, Wanqi Jie, Tao Wang, Gangqiang Zha, Aoqiu Wang, Hui Yu, Lingyan Xu, Boru Zhou, Fan Yang, Yadong Xu & Yaxu Gu

  3. Imdetek Co., Ltd, Xixian new area, Xi’an, Xianyang, 712000, People’s Republic of China

    Dengke Wei & Zhiyu Duan

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  1. Shouzhi Xi
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  2. Wanqi Jie
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  3. Tao Wang
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Correspondence to Wanqi Jie or Tao Wang.

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Xi, S., Jie, W., Wang, T. et al. Studies on Cr electrode of CdZnTe detector for high energy radiation detection. J Mater Sci: Mater Electron 29, 5049–5056 (2018). https://doi.org/10.1007/s10854-017-8467-0

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  • DOI: https://doi.org/10.1007/s10854-017-8467-0

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