7 September 2011 Integrated organic optical sensor arrays based on ring-shaped organic photodiodes
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Abstract
We present an integrated optical sensor platform suitable for the parallel detection of multiple parameters in an array format. This sensor technology combines fluorescent sensor layers with ring-shaped thin-film organic photodiodes (OPDs), serving as integrated fluorescence detectors. The sensing layers are deposited by screen-printing on the upper side of a PET substrate, which is exposed to an analyte, whereas the ring-shaped photodiodes are monolithically integrated, by vapour phase deposition, on the backside of the transparent substrate, in correct alignment to the sensing layers. The monolithic integration of sensor layers and detectors on one common substrate as well as the special ring shaped form of the photodiodes guarantees that a maximum of the fluorescent light emitted from the sensor layers is collected. A key advantage of the above described sensor geometry is the straightforward potential to realise sensor arrays for the parallel detection of multiple parameters: different sensor spots are illuminated by commercial LEDs or alternatively with one large area OLED, and are read-out by individual integrated organic photodiodes, surrounding the respective sensor layers. Three different sensing principles including absorption, fluorescence and surface plasmon resonance can be applied in the same basic sensor platform. The functionality of the concept is demonstrated by an integrated oxygen sensor. Sensor schemes for the analytical parameters carbon dioxide, temperature and ammonia, are proposed. Efficient front end electronics enabling intensity and time domain detection of sensor signals for the testing and characterisation of the integrated sensor devices have been developed.
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Martin Sagmeister, Martin Sagmeister, Bernhard Lamprecht, Bernhard Lamprecht, Elke Kraker, Elke Kraker, Anja Haase, Anja Haase, Georg Jakopic, Georg Jakopic, Stefan Köstler, Stefan Köstler, Harald Ditlbacher, Harald Ditlbacher, Nicole Galler, Nicole Galler, Tobias Abel, Tobias Abel, Torsten Mayr, Torsten Mayr, } "Integrated organic optical sensor arrays based on ring-shaped organic photodiodes", Proc. SPIE 8118, Organic Semiconductors in Sensors and Bioelectronics IV, 811805 (7 September 2011); doi: 10.1117/12.893497; https://doi.org/10.1117/12.893497
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