Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/36092
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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