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

AuthorsTemiño, Inés; Basiricò, Laura; Fratelli, Ilaria; Tamayo, Adrián; Ciavatti, Andrea; Mas Torrent, Marta ; Fraboni, Beatrice
Issue Date1-May-2020
PublisherNature Publishing Group
CitationNature Communications 11(1): 2136 (2020)
AbstractOrganic 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.
Publisher version (URL)http://dx.doi.org/10.1038/s41467-020-15974-7
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