DataVXAdvanced Functional MaterialsPaper
journal article·2025-06Open access

Narrowband Detection via Charge Collection Narrowing Organic Photodetector Enabled by Low Bandgap Random Terpolymer for Biometric Sensing

Matilde Brunetta, Zhuoran Qiao, Adibah Zamhuri, Francesco Furlan, Martina Rimmele, Peter A. Gilhooly‐Finn, Lewis M. Cowen, Filip Aniés, Patipan Sukpoonprom, Stanley Cazaly, Julianna Panidi, Flurin Eisner, Martin Heeney, Bob C. Schroeder, Nicola Gasparini

Advanced Functional Materials· Volume 35· Issue 24
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Source abstract

Abstract

Abstract Achieving spectrally selective organic photodetectors (OPDs) without using broadband‐absorbing semiconductors with input filtering is a strenuous challenge. Charge collection narrowing (CCN) is a promising strategy to obtain spectrally selective near‐infrared (NIR) OPD by adopting a thick bulk heterojunction (BHJ) as active layers. In this work, a random terpolymer comprised from a diketopyrrolopyrrole (DPP), thiophene (T) and benzothiadiazole (BT), ran DPP‐2TBT, is prepared and used as a donor material in combination with the low bandgap non‐fullerene acceptor (NFA) IEICO‐4F. OPDs with a low dark current density (6.88 × 10 −9 A cm −2 ) and a 68 nm full‐width‐at‐half‐maximum (FWHM) narrowband response (R = 0.13 A W −1 at 916 nm) in the near‐infrared are achieved. Finally, an application of the OPD as a biometric heart‐rate sensor via photoplethysmography for real‐time monitoring is demonstrated.
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Research context

Electronic materials

OpenAlex topics: Analytical Chemistry and Sensors · Gas Sensing Nanomaterials and Sensors · Advanced Chemical Sensor Technologies

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Affiliations

Department of Materials Molecular Science Research Hub Imperial College London W12 0BZ UK

Department of Chemistry University College London 20 Gordon Street London WC1H 0AJ UK

Department of Chemistry and Centre for Processable Electronics Imperial College London London W120BZ UK

King Abdullah University of Science and Technology (KAUST) Thuwal 23955‐6900 Saudi Arabia

Department of Material Science and Engineering Vidyasirimedhi Institute of Science and Technology (VISTEC) Rayong 21210 Thailand

School of Engineering and Materials Science Queen Mary University of London Mile End Road London E1 4NS UK

Funding

UK Research and Innovation · Engineering and Physical Sciences Research Council

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