期刊
NATURE COMMUNICATIONS
卷 13, 期 1, 页码 -出版社
NATURE PORTFOLIO
DOI: 10.1038/s41467-022-32845-5
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资金
- Research Foundation Flanders (FWO Vlaanderen) [G0D0118N, G0B2718N, 1S50820N, 11D2618N]
- European Research Council (ERC) [864625]
- European Union's Horizon 2020 research and innovation program under the Marie-Curie grant [882794]
- FWO
- Ser Cymru II Program through the European Regional Development Fund
- Welsh European Funding Office
- Marie Curie Actions (MSCA) [882794] Funding Source: Marie Curie Actions (MSCA)
- European Research Council (ERC) [864625] Funding Source: European Research Council (ERC)
Researchers have developed a general and facile approach for wavelength-selective near-infrared photodetection using nonfullerene blends. These spectrally selective photodetectors demonstrate high external quantum efficiencies and detectivities at specific wavelengths.
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 similar to 20-30% at wavelengths of 900-1100 nm, with a full-width-at-half-maximum of <= 50 nm, as well as detectivities of >10(12) Jones.
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