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

Quan Liu (), Stefan Zeiske, Xueshi Jiang, Derese Desta, Sigurd Mertens, Sam Gielen, Rachith Shanivarasanthe, Hans-Gerd Boyen, Ardalan Armin and Koen Vandewal ()
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Quan Liu: Hasselt University
Stefan Zeiske: Swansea University
Xueshi Jiang: Hasselt University
Derese Desta: Hasselt University
Sigurd Mertens: Hasselt University
Sam Gielen: Hasselt University
Rachith Shanivarasanthe: Hasselt University
Hans-Gerd Boyen: Hasselt University
Ardalan Armin: Swansea University
Koen Vandewal: Hasselt University

Nature Communications, 2022, vol. 13, issue 1, 1-11

Abstract: 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.

Date: 2022
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DOI: 10.1038/s41467-022-32845-5

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