Proceedings of Online International Conference on Hybrid and Organic Photovoltaics (OnlineHOPV20)
Publication date: 22nd May 2020
Near infrared photodetectors are key components in many disciplines, from astronomy and material sciences all the way to medical sciences. Current technologies are now striving to include new aspects in this technology such as wearability, flexibility and tuneability. Organic photodetectors easily offer many of those advantages but their relatively high bandgaps hinder NIR operation. In this work, we demonstrate solution processed organic photodetectors with improved NIR response thanks to a nanostructured active layer in the shape of a photonic crystal. The latter strongly increases the charge transfer state absorption, which is normally weak but broadband, increasing the optical path of light, resulting in remarkable photoresponse significantly below the band gap of the blend.[1-4] We show responsibilities up to 50 mA W-1 at 900 nm for PBTTT:PC70BM based photodetectors. Furthermore, by varying the lattice parameter of the photonic crystal structure, the spectral response of the photodetectors can be easily tuned beyond 1000 nm. Furthermore, our photonic structure that can be easily implemented in the device in a single nanoimprinting step, with minimal disruption of the fabrication process, which makes this approach very promising for upscaling.
We greatly acknowledge financial support from the Ministerio de Ciencia, Innovación y Universidades MICINN with projects PGC2018-095411-B-I00, MAT2016-79053-P and MAT2015- 70850-P and the “Severo Ochoa” excellence program SEV-2015-0496; Generalitat de Catalunya program AGAUR 2017-SGR-00488; and the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (grants no. CoG648901 and StG637116). P.M acknowledges financial support from an FPI contract (2017) of the MICINN (Spain) cofounded by the ESF. M.G.R acknowledges financial support from an FPU grant (no. 16/02631) (2017) of the MICINN (Spain). M. G. R. and P. M. B. acknowledge the departments of Physics, Chemistry and Geology of the Autonomous University of Barcelona (UAB) as coordinators of the PhD programme in Materials Science.
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