X-ray imaging with scintillator-sensitized hybrid organic photodetectors

Buechele P, Richter M, Tedde SF, Matt G, Ankah GN, Fischer R, Biele M, Metzger W, Lilliu S, Bikondoa O, Macdonald JE, Brabec C, Kraus T, Lemmer U, Schmidt O (2015)

Publication Language: English

Publication Status: Published

Publication Type: Journal article, Original article

Publication year: 2015


Publisher: Nature Publishing Group

Book Volume: 9

Pages Range: 843-848

Journal Issue: 12

DOI: 10.1038/nphoton.2015.216


Medical X-ray imaging requires cost-effective and high-resolution flat-panel detectors for the energy range between 20 and 120€...keV. Solution-processed photodetectors provide the opportunity to fabricate detectors with a large active area at low cost. Here, we present a disruptive approach that improves the resolution of such detectors by incorporating terbium-doped gadolinium oxysulfide scintillator particles into an organic photodetector matrix. The X-ray induced light emission from the scintillators is absorbed within hundreds of nanometres, which is negligible compared with the pixel size. Hence, optical crosstalk, a limiting factor in the resolution of scintillator-based X-ray detectors, is minimized. The concept is validated with a 256 × 256 pixel detector with a resolution of 4.75€...lp mm '1 at a MTF = 0.2, significantly better than previous stacked scintillator-based flat-panel detectors. We achieved a resolution that proves the feasibility of solution-based detectors in medical applications. Time-resolved electrical characterization showed enhanced charge carrier mobility with increased scintillator filling, which is explained by morphological changes.

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Buechele, P., Richter, M., Tedde, S.F., Matt, G., Ankah, G.N., Fischer, R.,... Schmidt, O. (2015). X-ray imaging with scintillator-sensitized hybrid organic photodetectors. Nature Photonics, 9(12), 843-848. https://doi.org/10.1038/nphoton.2015.216


Buechele, Patric, et al. "X-ray imaging with scintillator-sensitized hybrid organic photodetectors." Nature Photonics 9.12 (2015): 843-848.

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