Tuning Electronic and Morphological Properties for High?Performance Wavelength?Selective Organic Near?Infrared Cavity Photodetectors
نویسندگان
چکیده
Incorporation of compact spectroscopic near-infrared (NIR) light detectors into various wearable and handheld devices opens up new applications, such as on-the-spot medical diagnostics. To extend beyond the detection window silicon, i.e., past 1000 nm, organic semiconductors are highly attractive because their tunable absorption. In particular, NIR wavelength-selective have been realized by incorporating donor:acceptor thin films, exhibiting weak intermolecular charge-transfer (CT) absorption, an optical microcavity architecture. this work, alkyl side chains well-known PBTTT donor polymer replaced alkoxy substituents, hereby redshifting CT absorption polymer:PC61BM blend. It is shown that unique fullerene intercalation features retained when half altered, maximizing polymer:fullerene interfacial area thus strength. This exploited to range narrow-band photodetectors with a full-width-at-half-maximum 30–38 nm wavelengths between 840 1340 yielding detectivities in 5 × 1011 1.75 1010 Jones, despite low state energy 0.98 eV. The broad wavelength tuning achieved using single blend renders system ideal candidate for miniature spectrophotometers.
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ژورنال
عنوان ژورنال: Advanced Functional Materials
سال: 2021
ISSN: ['1616-301X', '1616-3028']
DOI: https://doi.org/10.1002/adfm.202108146