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Title: Near-infrared organic photodetectors based on bay-annulated indigo showing broadband absorption and high detectivities up to 1.1 mu m
Authors: Verstraeten, Frederik 
Gielen, Sam 
Verstappen, Pieter 
Kesters, Jurgen 
Georgitzikis, Epimitheas
Raymakers, Jorne 
Cheyns, David
Malinowski, Pawel
Daenen, Michael 
Lutsen, Laurence 
Vandewal, Koen 
Maes, Wouter 
Issue Date: 2018
Source: JOURNAL OF MATERIALS CHEMISTRY C, 6 (43), p. 11645-11650
Abstract: Near-infrared photodetection is valuable for numerous scientific, industrial and recreational applications. The implementation of organic semiconductors in near-infrared photodetectors offers additional advantages, such as printability on flexible substrates, reduced manufacturing costs and facile tuning of the detection range. In this work, the nature-inspired bay-annulated indigo (BAI) dye is employed as a building block for near-infrared sensitive, push-pull type conjugated polymers. The electron-deficient BAI moiety is copolymerized with a set of electron-rich monomers, affording polymers with an absorption onset up to 1300 nm and a sufficiently high lowest unoccupied molecular orbital, allowing electron transfer to standard fullerene acceptors. Bulk heterojunction type organic photodetectors are fabricated and the resulting device characteristics are analysed. The best performing photodetector is based on the polymer PTTBAI comprising thieno[3,2-b]thiophene as the electron-rich moiety. It has a superior light to dark current ratio, with a dark current density of 10(-7) A cm(-2), resulting in a (shot-noise limited) detectivity of 10(12) Jones at -2 V bias within the spectral window of 600-1100 nm, exceeding the detectivity of conventional silicon CCD photodetectors in the near-infrared region (approximate to 10(11) Jones).
Notes: [Verstraeten, Frederik; Gielen, Sam; Verstappen, Pieter; Kesters, Jurgen; Raymakers, Jorne; Daenen, Michael; Lutsen, Laurence; Vandewal, Koen; Maes, Wouter] UHasselt Hasselt Univ, Inst Mat Res IMO, Agoralaan 1 Bldg D, B-3590 Diepenbeek, Belgium. [Georgitzikis, Epimitheas; Cheyns, David; Malinowski, Pawel] IMEC, Kapeldreef 75, B-3001 Leuven, Belgium. [Georgitzikis, Epimitheas] Katholieke Univ Leuven, ESAT, Kasteelpk Arenberg 10, B-3001 Leuven, Belgium. [Daenen, Michael; Lutsen, Laurence; Vandewal, Koen; Maes, Wouter] IMEC, Associated Lab IMOMEC, Wetenschapspk 1, B-3590 Diepenbeek, Belgium.
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ISSN: 2050-7526
e-ISSN: 2050-7534
DOI: 10.1039/c8tc04164d
ISI #: 000449702600015
Category: A1
Type: Journal Contribution
Validations: ecoom 2019
Appears in Collections:Research publications

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