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Electron-donating amine-interlayer induced n-type doping of polymer:nonfullerene blends for efficient narrowband near-infrared photo-detection

Quan Liu Orcid Logo, Stefan Zeiske, Xueshi Jiang, Derese Desta, Sigurd Mertens, Sam Gielen, Rachith Shanivarasanthe, Hans-Gerd Boyen Orcid Logo, Ardalan Armin Orcid Logo, Koen Vandewal Orcid Logo

Nature Communications, Volume: 13, Issue: 1

Swansea University Authors: Stefan Zeiske, Ardalan Armin Orcid Logo

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Abstract

Inherently narrowband near-infrared organic photodetectors are highly desired for many applications, including biological imaging and surveillance. However, they suffer from a low photon-to-charge conversion efficiencies and utilize spectral narrowing techniques which strongly rely on the used mater...

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Published in: Nature Communications
ISSN: 2041-1723
Published: Springer Science and Business Media LLC 2022
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa61227
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Abstract: Inherently narrowband near-infrared organic photodetectors are highly desired for many applications, including biological imaging and surveillance. However, they suffer from a low photon-to-charge conversion efficiencies and utilize spectral narrowing techniques which strongly rely on the used material or on a nano-photonic device architecture. Here, we demonstrate a general and facile approach towards wavelength-selective near-infrared phtotodetection through intentionally n-doping 500–600 nm-thick nonfullerene blends. We show that an electron-donating amine-interlayer can induce n-doping, resulting in a localized electric field near the anode and selective collection of photo-generated carriers in this region. As only weakly absorbed photons reach this region, the devices have a narrowband response at wavelengths close to the absorption onset of the blends with a high spectral rejection ratio. These spectrally selective photodetectors exhibit zero-bias external quantum efficiencies of ~20–30% at wavelengths of 900–1100 nm, with a full-width-at-half-maximum of ≤50 nm, as well as detectivities of >1012 Jones.
College: College of Science
Funders: We also thank the Research Foundation Flanders (FWO Vlaanderen) for continuing financial support (projects G0D0118N, G0B2718N, 1S50820N, 11D2618N), as well as the European Research Council (ERC, grant agreement 864625). Q.L. acknowledges financial support from the European Union’s Horizon 2020 research and innovation program under the Marie-Curie grant agreement no. 882794. S.G. acknowledges the FWO for his Ph.D fellowship. H.-G.B. and D.D. are very grateful to FWO for funding the HAXPES-lab instrument within the HERCULES program for large research infrastructure of the Flemish government. A.A. acknowledges support from Sêr Cymru II Program through the European Regional Development Fund and the Welsh European Funding Office.
Issue: 1