A hybrid CMOS-imager with a solution-processable polymer as photoactive layer

Daniela Baierl (), Lucio Pancheri, Morten Schmidt, David Stoppa, Gian-Franco Dalla Betta, Giuseppe Scarpa and Paolo Lugli
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Daniela Baierl: Institute for Nanoelectronics, Technische Universität München
Lucio Pancheri: Fondazione Bruno Kessler
Morten Schmidt: Institute for Nanoelectronics, Technische Universität München
David Stoppa: Fondazione Bruno Kessler
Gian-Franco Dalla Betta: University of Trento
Giuseppe Scarpa: Institute for Nanoelectronics, Technische Universität München
Paolo Lugli: Institute for Nanoelectronics, Technische Universität München

Nature Communications, 2012, vol. 3, issue 1, 1-8

Abstract: Abstract The solution-processability of organic photodetectors allows a straightforward combination with other materials, including inorganic ones, without increasing cost and process complexity significantly compared with conventional crystalline semiconductors. Although the optoelectronic performance of these organic devices does not outmatch their inorganic counterparts, there are certain applications exploiting the benefit of the solution-processability. Here we demonstrate that the small pixel fill factor of present complementary metal oxide semiconductor-imagers, decreasing the light sensitivity, can be increased up to 100% by replacing silicon photodiodes with an organic photoactive layer deposited with a simple low-cost spray-coating process. By performing a full optoelectronic characterization on this first solution-processable hybrid complementary metal oxide semiconductor-imager, including the first reported observation of different noise types in organic photodiodes, we demonstrate the suitability of this novel device for imaging. Furthermore, by integrating monolithically different organic materials to the chip, we show the cost-effective portability of the hybrid concept to different wavelength regions.

Date: 2012
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DOI: 10.1038/ncomms2180

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