WORKSHOP PAPER
Fully Organic Integrated Arrays on Flexible Substrates for X-Ray Imaging
Abstract
Organic photodetectors (OPDs) show high detectivity even with ultrathin (submicron) active layers and enable fabrication on large area, flexible substrates. In this work, 32x32 pixel arrays are demonstrated, where the active layer based on evaporated small molecules (SubPc/C60) is monolithically integrated with a pentacene thin-film transistor readout on foil. The imagers were designed to be sensitive in the wavelength range between 500 and 600 nm to match the output of a typical scintillator used for x-ray imaging. The mean dark current density is below 10-6 A/cm2, with a linearly increasing photocurrent from irradiance of 3 µW/cm2.Keywords
Organic photodetectors, Flexible substrates, X-Ray Imaging,References
1) Organic Electronics Association, "OE-A Roadmap for Organic and Printed Electronics", 2011. https://doi.org/10.1007/978-1-4614-3160-2_1
2) M. Ihama, H. Inomata, H. Asano, S. Imai, T. Mitsui, Y. Imada, M. Hayashi, T. Gotou, H. Suzuki, D. Sawaki, M. Hamano, T. Nakatani, and Y. Mishima, "CMOS Image Sensor with an Overlaid Organic Photoelectric Conversion Layer", IISW 2011, 2011
3) D. Baierl, L. Pancheri, M. Schmidt, D. Stoppa, G.-F. Dalla Betta, G. Scarpa, and P. Lugli, "A hybrid CMOS-imager with a solution-processable polymer as photoactive layer", Nature Communications, 2012. https://doi.org/10.1038/ncomms2180
4) B. P. Rand, J. Genoe, P. Heremans, and J. Poortmans, "Solar Cells Utilizing Small Molecular Weight Organic Semiconductors", Progress In Photovoltaics: Research And Applications, 2007. https://doi.org/10.1002/pip.788
5) H. H. P. Gommans, D. Cheyns, T. Aernouts, C. Girotto, J. Poortmans, and P. Heremans, "Electro-Optical Study of Subphthalocyanine in a Bilayer Organic Solar Cell", Advanced Functional Materials, 2007. https://doi.org/10.1002/adfm.200700398