Dual-Band Organic Photodetectors for Dual-Channel Optical Communications

Zhaojue Lan, Ying Suet Lau, Linfeng Cai, Jiayin Han, Chun Wai Suen, Furong Zhu*

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

26 Citations (Scopus)


The dual-band organic photodetectors (OPDs) detect incoming light selectively in two different bands. This work demonstrates a bias-switchable dual-band OPD, achieving a fast-switching speed of over 1000 times per second and a −3 dB cutoff frequency of > 100 kHz for high-speed optical communications in two distinct bands, e.g., near-infrared (NIR) and visible light. Visible-blind NIR detection with a high responsivity of 435 mA W–1 is realized for the OPDs operated under a small reverse bias of −1.0 V. NIR-blind visible light detection with a responsivity of 325 mA W–1 is obtained for the OPDs operated under a low forward bias of 1.0 V. Dual-channel NIR/visible optical communication technique has been demonstrated, providing an opportunity for a plethora of applications in information electronics and the Internet-of-Things.

Original languageEnglish
Article number2100602
JournalLaser and Photonics Reviews
Issue number7
Publication statusPublished - Jul 2022

Scopus Subject Areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics

User-Defined Keywords

  • bias-switchable
  • dual-band
  • heterojunctions
  • near-infrared
  • optical communication
  • organic photodetectors


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