High sensitivity organic inorganic hybrid X-ray detectors with direct transduction and broadband response

H. M. Thirimanne, K. D. G. I. Jayawardena, A. J. Parnell, R. M. I. Bandara, A. Karalasingam, S. Pani, J. E. Huerdler, D. G. Lidzey, S. F. Tedde, A. Nisbet, C. A. Mills and S. R. P. Silva ()
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H. M. Thirimanne: University of Surrey, Guildford
K. D. G. I. Jayawardena: University of Surrey, Guildford
A. J. Parnell: University of Sheffield
R. M. I. Bandara: University of Surrey, Guildford
A. Karalasingam: University of Surrey, Guildford
S. Pani: University of Surrey, Guildford
J. E. Huerdler: Technology Centre
D. G. Lidzey: University of Sheffield
S. F. Tedde: Technology Centre
A. Nisbet: University of Surrey, Guildford
C. A. Mills: University of Surrey, Guildford
S. R. P. Silva: University of Surrey, Guildford

Nature Communications, 2018, vol. 9, issue 1, 1-10

Abstract: Abstract X-ray detectors are critical to healthcare diagnostics, cancer therapy and homeland security, with many potential uses limited by system cost and/or detector dimensions. Current X-ray detector sensitivities are limited by the bulk X-ray attenuation of the materials and consequently necessitate thick crystals (~1 mm–1 cm), resulting in rigid structures, high operational voltages and high cost. Here we present a disruptive, flexible, low cost, broadband, and high sensitivity direct X-ray transduction technology produced by embedding high atomic number bismuth oxide nanoparticles in an organic bulk heterojunction. These hybrid detectors demonstrate sensitivities of 1712 µC mGy−1 cm−3 for “soft” X-rays and ~30 and 58 µC mGy−1 cm−3 under 6 and 15 MV “hard” X-rays generated from a medical linear accelerator; strongly competing with the current solid state detectors, all achieved at low bias voltages (−10 V) and low power, enabling detector operation powered by coin cell batteries.

Date: 2018
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DOI: 10.1038/s41467-018-05301-6

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