Journal
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
Volume 580, Issue 1, Pages 774-777Publisher
ELSEVIER
DOI: 10.1016/j.nima.2007.05.105
Keywords
organic semiconductors; conjugated polymers; digital radiography
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Funding
- Engineering and Physical Sciences Research Council [EP/C540336/1, EP/C540344/1, EP/C539508/1, EP/C010434/1] Funding Source: researchfish
- EPSRC [EP/C539508/1] Funding Source: UKRI
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We investigate the potential for replacing inorganic semiconductors with polymeric semiconductors in medical X-ray imaging applications. Polymeric semiconductors are soft and can be fabricated using techniques such as spin coating and jet printing, leading to reductions in fabrication costs for large-area arrays, easy integration of heterostructures and composite materials and the possibility of using flexible substrates. By using a combined cascaded linear systems and Monte-Carlo model to simulate the imaging system, we establish a set of semiconductor requirements for a feasible flat-panel imager (FPI). We have fabricated photodiodes and thin-film transistors (TFTs) out of a variety of polymer materials. Polymer photodiodes coupled to phosphor screens have shown a response to X-ray radiation with a good efficiency. Both transistors and photodiodes were sufficiently radiation hard for use in clinical imaging conditions. A composite phosphor polymer material has been fabricated and has been found to be compatible with polymeric photodiodes. The composite material can be fabricated within a structure as part of the semiconductor fabrication process. (C) 2007 Elsevier B.V. All rights reserved.
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