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Morphology and mobility as tools to control and unprecedentedly enhance X-ray sensitivity in organic thin-films

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  • Inés Temiño

    (Institut de Ciència de Materials de Barcelona (ICMAB-CSIC)
    CIBER-BBN)

  • Laura Basiricò

    (University of Bologna
    National Institute for Nuclear Physics—INFN section of Bologna)

  • Ilaria Fratelli

    (University of Bologna
    National Institute for Nuclear Physics—INFN section of Bologna)

  • Adrián Tamayo

    (Institut de Ciència de Materials de Barcelona (ICMAB-CSIC)
    CIBER-BBN)

  • Andrea Ciavatti

    (University of Bologna
    National Institute for Nuclear Physics—INFN section of Bologna)

  • Marta Mas-Torrent

    (Institut de Ciència de Materials de Barcelona (ICMAB-CSIC)
    CIBER-BBN)

  • Beatrice Fraboni

    (University of Bologna
    National Institute for Nuclear Physics—INFN section of Bologna)

Abstract

Organic semiconductor materials exhibit a great potential for the realization of large-area solution-processed devices able to directly detect high-energy radiation. However, only few works investigated on the mechanism of ionizing radiation detection in this class of materials, so far. In this work we investigate the physical processes behind X-ray photoconversion employing bis-(triisopropylsilylethynyl)-pentacene thin-films deposited by bar-assisted meniscus shearing. The thin film coating speed and the use of bis-(triisopropylsilylethynyl)-pentacene:polystyrene blends are explored as tools to control and enhance the detection capability of the devices, by tuning the thin-film morphology and the carrier mobility. The so-obtained detectors reach a record sensitivity of 1.3 · 104 µC/Gy·cm2, the highest value reported for organic-based direct X-ray detectors and a very low minimum detectable dose rate of 35 µGy/s. Thus, the employment of organic large-area direct detectors for X-ray radiation in real-life applications can be foreseen.

Suggested Citation

  • Inés Temiño & Laura Basiricò & Ilaria Fratelli & Adrián Tamayo & Andrea Ciavatti & Marta Mas-Torrent & Beatrice Fraboni, 2020. "Morphology and mobility as tools to control and unprecedentedly enhance X-ray sensitivity in organic thin-films," Nature Communications, Nature, vol. 11(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:11:y:2020:i:1:d:10.1038_s41467-020-15974-7
    DOI: 10.1038/s41467-020-15974-7
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