Spectroscopic near-infrared photodetectors enabled by strong light-matter coupling in (6,5) single-walled carbon nanotubes
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Strong light-matter coupling leads to the formation of mixed exciton-polariton states, allowing for a rigorous manipulation of the absorption and emission of excitonic materials. Here, we demonstrate the realization of this promising concept in organic photodetectors. By hybridizing the E11 exciton of semiconducting (6,5) single-walled carbon nanotubes (SWNTs) with near-infrared cavity photons, we create spectrally tunable polariton states within a photodiode. In turn, we are able to red-shift the detection peak which coincides with the lower polariton band. Our photodiodes comprise a metal cavity to mediate strong coupling between light and SWNTs and utilize P3HT and PC70BM as electron donor and acceptor, respectively. The diodes are formed either via mixing of SWNTs, P3HT and PC70BM to create a bulk heterojunction or by sequential processing of layers to form flat heterojunctions. The resulting near-infrared sensors show tunable, efficient exciton harvesting in an application-relevant wavelength range between 1000 nm and 1300 nm, with optical simulations showing a possible extension beyond 1500 nm.
Mischok , A , Lüttgens , J , Berger , F , Hillebrandt , S G H , Tenopala Carmona , F , Kwon , S , Murawski , C , Siegmund , B , Zaumseil , J & Gather , M C 2020 , ' Spectroscopic near-infrared photodetectors enabled by strong light-matter coupling in (6,5) single-walled carbon nanotubes ' , Journal of Chemical Physics , vol. 153 , no. 20 , 201104 . https://doi.org/10.1063/5.0031293
Journal of Chemical Physics
Copyright © 2020 the Author(s). Published under license by AIP Publishing. This work has been made available online in accordance with publisher policies or with permission. Permission for further reuse of this content should be sought from the publisher or the rights holder. This is the final published version of the work, which was originally published at https://doi.org/10.1063/5.0031293.
DescriptionSpecial Issue: Polariton Chemistry: Molecules in Cavities and Plasmonic Media. Funding: The authors gratefully acknowledge funding by the Volkswagen Foundation within project No. 93404. A.M. acknowledges further funding through an individual fellowship of the Deutsche Forschungsgemeinschaft (No. 404587082).
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