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Proceedings Paper

X-ray imaging sensor arrays on foil using solution processed organic photodiodes and organic transistors
Author(s): Abhishek Kumar; Date Moet; Jan-Laurens van der Steen; Ashutosh Tripathi; Francisco Gonzalez Rodriguez; Joris Maas; Matthias Simon; Walter Reutten; Alexander Douglas; Rob Raaijmakers; Pawel E. Malinowski; Kris Myny; Umar Shafique; Ronn Andriessen; Paul Heremans; Gerwin Gelinck
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Paper Abstract

We demonstrate organic imaging sensor arrays fabricated on flexible plastic foil with the solution processing route for both photodiodes and thin film transistors. We used the photovoltaic P3HT:PCBM blend for fabricating the photodiodes using spin coating and pentacene as semiconductor material for the TFTs. Photodiodes fabricated with P3HT:PCBM absorb in the green part of the visible spectrum which matches with the typical scintillator output wavelength. The arrays consist of 32x32 pixels with variation in pixel resolution of 200μmx200μm, 300μmx300μm and of 1mmx1mm. The accurate reproducibility of shadow images of the objects demonstrates the potential of these arrays for imaging purposes. We also demonstrate that the crosstalk is relatively insignificant despite the fact that the active photodiode forms a continuous layer in the array. Since both photodiodes and TFTs are made of organic material, they are processed at low temperatures below 150°C on foil which means that these imaging sensors can be flexible, light weight and low cost when compared to conventional amorphous silicon based imaging sensors on rigid substrates. In combination with a scintillator on top of the arrays, we show the potential of these arrays for the X-ray imaging applications.

Paper Details

Date Published: 1 May 2014
PDF: 13 pages
Proc. SPIE 9137, Organic Photonics VI, 91370Q (1 May 2014); doi: 10.1117/12.2051224
Show Author Affiliations
Abhishek Kumar, Holst Ctr. (Netherlands)
Date Moet, Holst Ctr. (Netherlands)
Jan-Laurens van der Steen, Holst Ctr. (Netherlands)
Ashutosh Tripathi, Holst Ctr. (Netherlands)
Francisco Gonzalez Rodriguez, Holst Ctr. (Netherlands)
Joris Maas, Holst Ctr. (Netherlands)
Matthias Simon, Philips Research (Netherlands)
Walter Reutten, Philips Research (Netherlands)
Alexander Douglas, Philips Research (Netherlands)
Rob Raaijmakers, Philips Healthcare (Netherlands)
Pawel E. Malinowski, IMEC (Belgium)
Kris Myny, IMEC (Belgium)
Umar Shafique, Univ. of Waterloo (Canada)
Ronn Andriessen, Holst Ctr. (Netherlands)
Paul Heremans, Holst Ctr. (Netherlands)
IMEC (Belgium)
Gerwin Gelinck, Holst Ctr. (Netherlands)

Published in SPIE Proceedings Vol. 9137:
Organic Photonics VI
Barry P. Rand; Chihaya Adachi; David Cheyns; Volker van Elsbergen, Editor(s)

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