Εξειδίκευση τύπου :	Άρθρο σε επιστημονικό περιοδικό
Τίτλος:	Selective Charge Extraction Allows Fast Photomultiplication and Imaging in Rigid and Ultra‐Flexible SWIR Organic Photodiodes
Δημιουργός/Συγγραφέας:	Brunetta, Matilde Qiao, Zhuoran Nodari, Davide Sasaki, Kosei Furlan, Francesco Rimmele, Martina Kim, Hongki Chen, Hongting Tagawa, Yusaku Marsh, Adam Vasant, Rushil Do, Sang Rodríguez‐Martínez, Xabier Sharma, Anirudh [EL] Χώχος, Χρήστος[EN] Chochos, Christos Martin, Jaime Heeney, Martin Vandewal, Koen Baran, Derya Nguyen, Thuc‐Quyen Schroeder, Bob C. Someya, Takao Yokota, Tomoyuki Gasparini, Nicola
Ημερομηνία:	2026
Γλώσσα:	Αγγλικά
ISSN:	1614-6832 1614-6840
DOI:	10.1002/aenm.202506776
Περίληψη:	Expanding the absorption window of organic photodiodes (OPDs) over the 1000 nm benchmark is essential for bioimaging and medical applications. However, progressing into this wavelength range has proven to be a challenging task due to the scarcity of near-infrared (NIR) semiconducting polymers and small molecules with suitable energy alignment and processability. OPDs based on low-bandgap donor polymers generally present low responsivities and, therefore, low detectivities in the NIR. Photomultiplication (PM) has been introduced as a promising strategy to increase the external quantum efficiency (EQE) above unity. However, its application has been mainly limited to OPDs operating in the visible range and with response speeds within the millisecond range. In this work, we present PM-OPDs utilizing an equal donor (D):acceptor (A) ratio in the bulk heterojunction photoactive layer. This changes the common understanding of PM-OPDs, in which heavily unbalanced D:A ratios were needed to impose trap-assisted charge tunnelling injection at high reverse bias. Here, the NIR polymer TQ-3T was used with nonfullerene acceptor Y6. PM-OPDs with an EQE of above 1100% at 840 nm and 31% at 1100 nm at -10 V, and fast response times of 73 µs were achieved. We also demonstrate ultrathin (<3 µm) flexible PM-OPDs based on the TQ-3T:Y6 blend without any drop in performance compared to rigid samples with a stable dark current density after 1000 bending cycles. Finally, we demonstrate an application of the PM-OPD as a flexible and pulse oximeter and large-area image sensor for accurate vein recognition.
Τίτλος πηγής δημοσίευσης:	Advanced Energy Materials
Θεματική Κατηγορία:	[EL] Νανοτεχνολογία[EN] Nanotechnology [EL] Εφαρμοσμένη οπτική. Φωτονική[EN] Applied optics. Photonics [EL] Βιοιατρική μηχανική. Ηλεκτρονική. Ενοργάνιση[EN] Biomedical engineering. Electronics. Instrumentation [EL] Ηλεκτρική μηχανική. Ηλεκτρονική. Πυρινική μηχανικη[EN] Electrical engineering. Electronics. Nuclear engineering
Λέξεις-Κλειδιά:	biomedical sensor flexible organic photodiode IR detection organic photodiode photomultiplication pulse oximeter ultralow bandgap polymer
Χρηματοδότης:	Japan Science and Technology Agency (JST) National Science Foundation (NSF) - Division of Materials Research European Commission Engineering and Physical Sciences Research Council (EPSRC) King Abdullah University of Science and Technology (KAUST)
Αναγνωριστικό χρηματοδοτικού προγράμματος:	JPMJAP2336 2404409 101172797 MR/Y003802/1 ORFS-2023-OFP-5544
Κάτοχος πνευματικών δικαιωμάτων:	© 2026 The Author(s). Advanced Energy Materials published by Wiley-VCH GmbH
Όροι και προϋποθέσεις δικαιωμάτων:	This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Ηλεκτρονική διεύθυνση στον εκδότη (link):	https://doi.org/10.1002/aenm.202506776
Εμφανίζεται στις συλλογές:	Ινστιτούτο Χημικής Βιολογίας - Επιστημονικό έργο