Direct X-ray photoconversion in flexible organic thin film devices operated below 1 V

Laura Basiricò (), Andrea Ciavatti, Tobias Cramer, Piero Cosseddu, Annalisa Bonfiglio and Beatrice Fraboni ()
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Laura Basiricò: University of Bologna
Andrea Ciavatti: University of Bologna
Tobias Cramer: University of Bologna
Piero Cosseddu: University of Cagliari
Annalisa Bonfiglio: University of Cagliari
Beatrice Fraboni: University of Bologna

Nature Communications, 2016, vol. 7, issue 1, 1-9

Abstract: Abstract The application of organic electronic materials for the detection of ionizing radiations is very appealing thanks to their mechanical flexibility, low-cost and simple processing in comparison to their inorganic counterpart. In this work we investigate the direct X-ray photoconversion process in organic thin film photoconductors. The devices are realized by drop casting solution-processed bis-(triisopropylsilylethynyl)pentacene (TIPS-pentacene) onto flexible plastic substrates patterned with metal electrodes; they exhibit a strong sensitivity to X-rays despite the low X-ray photon absorption typical of low-Z organic materials. We propose a model, based on the accumulation of photogenerated charges and photoconductive gain, able to describe the magnitude as well as the dynamics of the X-ray-induced photocurrent. This finding allows us to fabricate and test a flexible 2 × 2 pixelated X-ray detector operating at 0.2 V, with gain and sensitivity up to 4.7 × 104 and 77,000 nC mGy−1 cm−3, respectively.

Date: 2016
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Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms13063

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DOI: 10.1038/ncomms13063

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