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Crystallite Size Effect on X-ray-instigated Photocurrent Properties of PbWO4 Thick Film

  • Original Article – Nanomaterials
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Abstract

X-rays are widely used in many domains such as clinical diagnostic, imaging, industrial inspection, and environmental safety, allowing researchers for innoviative superior low-dose sensor development. In direct detection type of X-ray, X-ray photons are directly absorbed by photoconductors such as HgI2, PbI2, and BiI3 that are the available X-ray semiconductor detectors. This study analyzes the properties of micro and nanocrystalline PbWO4 prepared as thick film above the interdigitated electrode for direct photon detection. PbWO4 was found to have a better attenuation value of ~ 6.13 cm2/g at 70 keV as compared with the existing semiconductor detectors. The X-ray-instigated photocurrent behavior of PbWO4 was measured at various low doses by an intra-oral 70 keV machine connected with a Keithley model 2450 measuring source meter. Maximum sensitivity was found to be about 0.40 and 9.80 nC/mGycm3, respectively, for micro and nanocrystalline PbWO4, obtained at 7.97 mGy dose. The nanocrystalline PbWO4 thick film displayed more than twenty-four times sensitivity as compared with the microcrystalline PbWO4 film by virtue of the nanocrystalline size effect on X-ray detection.

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Acknowledgements

Authors thank Mr. B.S. Ajith Kumar for his assistance in sample preparation, Mrs. T. Subashini for TEM image analysis and Ms. Kalpana Pandian, SEM analyst, SAIF, IITM, Chennai for her assistant in Cs-SEM thickness analysis.

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Authors and Affiliations

  1. National Centre for Nanoscience and Nanotechnology, University of Madras, Chennai, 600025, Tamil Nadu, India

    R. R. Karthieka & T. Prakash

  2. Department of Nanotechnology, SRM Institute of Science and Technology, Kancheepuram District, Kattankulathur, 603203, Tamil Nadu, India

    G. Devanand Venkatasubbu

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  1. R. R. Karthieka
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Correspondence to T. Prakash.

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Karthieka, R.R., Venkatasubbu, G.D. & Prakash, T. Crystallite Size Effect on X-ray-instigated Photocurrent Properties of PbWO4 Thick Film. Electron. Mater. Lett. 18, 304–312 (2022). https://doi.org/10.1007/s13391-022-00339-7

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