Journal
NATURE PHOTONICS
Volume 9, Issue 12, Pages 843-848Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/NPHOTON.2015.216
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Funding
- German Federal Ministry for Education and Research (BMBF) [13N12377]
- Ernst von Siemens Doctoral Fellowship (Ernst-von-Siemens-Promotionsstipendium)
- Bavarian Ministry of Economic Affairs and Media, Energy and Technology
- German Research Foundation (DFG) [GRK 1896]
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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 x 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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