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Title: | Tuning Electronic and Morphological Properties for High-Performance Wavelength-Selective Organic Near-Infrared Cavity Photodetectors | Authors: | VANDERSPIKKEN, jochen LIU, Quan Liu, Z. VANDERMEEREN, Tom CARDEYNAELS, Tom GIELEN, Sam Van Mele, B Van den Brande, N Champagne, B VANDEWAL, Koen MAES, Wouter |
Issue Date: | 2022 | Publisher: | WILEY-V C H VERLAG GMBH | Source: | Advanced functional materials (Print), 32(9), (Art N° 2108146) | Abstract: | 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 of silicon, i.e., past 1000 nm, organic semiconductors are highly attractive because of their tunable absorption. In particular, organic NIR wavelength-selective detectors have been realized by incorporating donor:acceptor thin films, exhibiting weak intermolecular charge-transfer (CT) absorption, into an optical microcavity architecture. In this work, the alkyl side chains of the well-known PBTTT donor polymer are replaced by alkoxy substituents, hereby redshifting the CT absorption of the polymer:PC61BM blend. It is shown that the unique fullerene intercalation features of the PBTTT polymer are retained when half of the side chains are altered, hereby maximizing the polymer:fullerene interfacial area and thus the CT absorption strength. This is exploited to extend the detection range of organic narrow-band photodetectors with a full-width-at-half-maximum of 30-38 nm to wavelengths between 840 and 1340 nm, yielding detectivities in the range of 5 x 10(11) to 1.75 x 10(10) Jones, despite the low CT state energy of 0.98 eV. The broad wavelength tuning range achieved using a single polymer:fullerene blend renders this system an ideal candidate for miniature NIR spectrophotometers. | Keywords: | charge-transfer absorption;intercalation;narrow-band;near-infrared;optical cavities | Document URI: | http://hdl.handle.net/1942/36092 | ISSN: | 1616-301X | e-ISSN: | 1616-3028 | DOI: | 10.1002/adfm.202108146 | ISI #: | WOS:000720282500001 | Rights: | 2021 Wiley-VCH GmbH | Category: | A1 | Type: | Journal Contribution | Validations: | ecoom 2022 |
Appears in Collections: | Research publications |
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File | Description | Size | Format | |
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Tuning Electronic and Morphological Properties for High-Performance Wavelength-Selective Organic Near-Infrared Cavity Photodetectors.pdf | Peer-reviewed author version | 4.33 MB | Adobe PDF | View/Open |
Adv Funct Materials - 2021 - Vanderspikken - Tuning Electronic and Morphological Properties for High‐Performance.pdf Restricted Access | Published version | 1.44 MB | Adobe PDF | View/Open Request a copy |
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