Narrowband Detection via Charge Collection Narrowing Organic Photodetector Enabled by Low Bandgap Random Terpolymer for Biometric Sensing
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.
Authors
- Filip Aniés (ORCID: https://orcid.org/0000-0002-3593-0828)
- Peter A. Gilhooly‐Finn (ORCID: https://orcid.org/0000-0002-5113-8873)
- Patipan Sukpoonprom (ORCID: https://orcid.org/0009-0006-3388-2443)
- Flurin D. Eisner (ORCID: https://orcid.org/0000-0001-5507-4961)
- Julianna Panidi (ORCID: https://orcid.org/0000-0003-3701-1857)
- Martin Heeney (ORCID: https://orcid.org/0000-0001-6879-5020)
- Martina Rimmele (ORCID: https://orcid.org/0000-0002-6852-5933)
- Nicola Gasparini (ORCID: https://orcid.org/0000-0002-3226-8234)
- Lewis Cowen (ORCID: https://orcid.org/0000-0003-0019-7731)
- Zhuoran Qiao (ORCID: https://orcid.org/0000-0002-6144-4081)
- Francesco Furlan (ORCID: https://orcid.org/0000-0003-3312-3288)
- Bob C. Schroeder (ORCID: https://orcid.org/0000-0002-9793-631X)
- Adibah Zamhuri
- Matilde Brunetta
- Stanley Cazaly
Institutions
- Queen Mary University of London (GB)
- Vidyasirimedhi Institute of Science and Technology (TH)
- University College London (GB)
- Imperial College London (GB)
- King Abdullah University of Science and Technology (SA)
Publication Details
- Journal
- Advanced Functional Materials
- Published
- 2025-01-10
- DOI
- https://doi.org/10.1002/adfm.202422637
- Citations
- 17
- Primary Topic
- Analytical Chemistry and Sensors
- Type
- article
- Field-Weighted Citation Impact
- 12.52
Funders
- UK Research and Innovation
- King Abdullah University of Science and Technology
- Engineering and Physical Sciences Research Council