Title
High performance x-ray imaging detectors on foil using solutionprocessed organic photodiodes with extremely low dark leakage current (Presentation Recording)
Author
Kumar, A.
Moet, D.
van der Steen, J.L.
van Breemen, A.J.J.M.
Shanmugam, S.
Gilot, J.
Andriessen, H.A.J.M.
Matthias, S.
Ruetten, W.
Douglas, A.
Raaijmakers, R.
Malinowski, P.E.
Myny, K.
Gelinck, G.H.
Publication year
2011
Abstract
We demonstrate high performance X-ray imaging detectors on foil suitable for medical grade X-ray imaging applications. The detectors are based on solution-processed organic photodiodes forming bulk-heterojunctions from photovoltaic donor and acceptor blend. The organic photodiodes are deposited using an industrially compatible slot die coating technique with end of line processing temperature below 100° C. These photodiodes have extremely low dark leakage current density of 10-7 mA/cm2 at -2V bias with very high yield and have peak absorption around 550 nm wavelength. We combine these organic photodiodes with high mobility metal oxide semiconductor based thin film transistor arrays with high pixel resolution of 200ppi on thin plastic substrate. When combined with a typical CsI(TI) scintillator material on top, they are well suited for low dose X-ray imaging applications. The optical crosstalk is insignificant upto resolution of 200 ppi despite the fact that the photodiode layer is one continuous layer and is non-pixelated. Low processing temperatures are another key advantage since they can be fabricated on plastic substrate. This implies that we can make X-ray detectors on flexible foil. Those detectors can be mechanically more robust and light weight when compared to amorphous Si based detectors fabricated on glass substrate.
Subject
Mechatronics, Mechanics & Materials
TFT - Thin Film Technology
TS - Technical Sciences
Electronics
Industrial Innovation
Efficiency
Light Extraction
Reflectivity
Flexible
Large Area
OLED
Thin film barrier
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http://resolver.tudelft.nl/uuid:d7e293fb-5692-4d2f-87a1-df90286edfa7
DOI
https://doi.org/10.1117/12.2187041
TNO identifier
533804
Source
Proceedings of SPIE, 95670, 12
Article number
95670U
Document type
conference paper