X-ray imaging with scintillator-sensitized hybrid organic photodetectors

Journal article
(Original article)

Publication Details

Author(s): 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
Journal: Nature Photonics
Publisher: Nature Publishing Group
Publication year: 2015
Volume: 9
Journal issue: 12
Pages range: 843-848
ISSN: 1749-4893
Language: English


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.

FAU Authors / FAU Editors

Brabec, Christoph Prof. Dr.
Institute Materials for Electronics and Energy Technology (i-MEET)
Matt, Gebhard Dr.
Institute Materials for Electronics and Energy Technology (i-MEET)
Richter, Moses
Institute Materials for Electronics and Energy Technology (i-MEET)

Additional Organisation
Graduiertenkolleg 1896/2 In situ Mikroskopie mit Elektronen, Röntgenstrahlen und Rastersonden
Interdisziplinäres Zentrum, Center for Nanoanalysis and Electron Microscopy (CENEM)

External institutions with authors

Cardiff University
European Synchrotron Radiation Facility (ESRF)
Karlsruhe Institute of Technology (KIT)
Leibniz-Institut für Neue Materialien gGmbH / Leibniz Institute for New Materials (INM)
Masdar Institute of Science and Technology
Siemens AG, Healthcare Sector

How to cite

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://dx.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.


Last updated on 2019-03-06 at 16:42