X-ray imager using solution processed organic transistor arrays and bulk heterojunction photodiodes on thin, flexible plastic substrate

• A very thin and light-weight X-ray imager is made on plastic film.
• All layers with the exception of the electrodes are solution processed.
• The photo-sensitive layer is continuous, simplifying the manufacturing process.
• Images are recorded at X-ray doses sufficiently low for medical applications.

We describe the fabrication and characterization of large-area active-matrix X-ray/photodetector array of high quality using organic photodiodes and organic transistors. All layers with the exception of the electrodes are solution processed. Because it is processed on a very thin plastic substrate of 25 μm thickness, the photodetector is only 100 μm thick. When combined with an 300-μm-thick X-ray scintillator, this gives a thin, low-weight and shatterproof X-ray detector of ca. 400 μm thickness. We demonstrate X-ray imaging under conditions that are used in medical applications.

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