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Fabrication and characterization of X-ray array detectors based on polycrystalline PbI2 thick films

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Abstract

Polycrystalline PbI2 thick films were grown by using close spaced vapor deposition method on glass substrate with a conducting indium–tin-oxide coating. The morphology shows a uniquely oriented film structure with hexagonal platelets accurately being upright on substrate surface. An array detector with 12 pixels was fabricated based on this structure of the thick film. It is shown that the dark current is lower than 3 nA at bias voltage below 500 V, and the dark resistivity is as high as 1011 Ω cm. A mapping of dark current density of the sensitive area of the array detector exhibits a better uniformity in the central area than the fringe area. A quick photocurrent response to X-ray excitation was obtained. The photoresponse rise time about 250 μs was obtained from the detectors and the photocurrent decays in a few seconds. The values of photocurrent are higher about two orders of magnitude than the values of dark current. The distribution of photocurrent is more uniform than that of dark current in the sensitive area of the detector.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China No. 50902012, Scientific Research Foundation of CUIT No. CSRF201005, Scientific Research Fund of Sichuan Provincial Education Department No. 10ZA131, Technology Support Program Fund of Science and Technology Department of Sichuan Province No. 2014GZ0020, and Strategic Emerging Products Project Fund of Sichuan Province No. 2014GZX0012.

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Authors and Affiliations

  1. College of Optoelectronic Technology, Chengdu University of Information Technology, No. 24, Block 1, Xuefu Road, Chengdu, 610225, People’s Republic of China

    Xinghua Zhu, Hui Sun, Dingyu Yang, Jun Yang, Xu Li & Xiuying Gao

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  1. Xinghua Zhu
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  2. Hui Sun
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  3. Dingyu Yang
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  4. Jun Yang
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Correspondence to Hui Sun.

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Zhu, X., Sun, H., Yang, D. et al. Fabrication and characterization of X-ray array detectors based on polycrystalline PbI2 thick films. J Mater Sci: Mater Electron 25, 3337–3343 (2014). https://doi.org/10.1007/s10854-014-2023-y

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