Статья

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

Laura BasiricòDepartment of Physics and Astronomy, University of Bologna, Viale Berti Pichat 6/2, Bologna 40127, ItalyAndrea CiavattiDepartment of Physics and Astronomy, University of Bologna, Viale Berti Pichat 6/2, Bologna 40127, ItalyTobias CramerDepartment of Physics and Astronomy, University of Bologna, Viale Berti Pichat 6/2, Bologna 40127, ItalyPiero CossedduDepartment of Electrical and Electronic Engineering, University of Cagliari, Piazza D'Armi, Cagliari 09123, ItalyAnnalisa BonfiglioDepartment of Electrical and Electronic Engineering, University of Cagliari, Piazza D'Armi, Cagliari 09123, ItalyBeatrice FraboniDepartment of Physics and Astronomy, University of Bologna, Viale Berti Pichat 6/2, Bologna 40127, Italy

2016en

ABI

Аннотация

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.

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Идентификаторы

DOI: 10.1038/ncomms13063

Цитирования и источники

Цитирований: 2Использованных источников: 0

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