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 × 10^4 and 77,000 nC mGy ^(-1) cm^(-3), respectively.

Basiricò, L., Ciavatti, A., Cramer, T., Cosseddu, P., Bonfiglio, A., Fraboni, B. (2016). Direct X-ray photoconversion in flexible organic thin film devices operated below 1 v. NATURE COMMUNICATIONS, 7, 1-9 [10.1038/ncomms13063].

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

BASIRICO', LAURA;CIAVATTI, ANDREA;CRAMER, TOBIAS;FRABONI, BEATRICE
2016

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 × 10^4 and 77,000 nC mGy ^(-1) cm^(-3), respectively.
2016
Basiricò, L., Ciavatti, A., Cramer, T., Cosseddu, P., Bonfiglio, A., Fraboni, B. (2016). Direct X-ray photoconversion in flexible organic thin film devices operated below 1 v. NATURE COMMUNICATIONS, 7, 1-9 [10.1038/ncomms13063].
Basiricò, Laura; Ciavatti, Andrea; Cramer, Tobias; Cosseddu, Piero; Bonfiglio, Annalisa; Fraboni, Beatrice
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/566246
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