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

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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.
Funding Information
  • UK Research and Innovation (MR/Y003802/1, MR/S031952/1)
  • Engineering and Physical Sciences Research Council (EP/W005875/1)

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