Filter-Free Band-Selective Organic Photodetectors

Zhaojue Lan, Ying Suet Lau, Yiwen Wang, Zuo Xiao, Liming Ding*, Dan Luo*, Fu Rong Zhu*

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

64 Citations (Scopus)


The present band-selective photodetection is realized by incorporating different optical filters with broadband photodetectors (PDs). However, the use of the optical filters reduces the overall PD sensitivity. This work reports on the effort to develop high-performance filter-free band-selective organic photodetectors (OPDs) having a heterostructure photoactive layer architecture, comprising a semiconducting shorter-wavelength light depletion layer and a bulk heterojunction (BHJ) layer with an extended absorption to longer wavelengths. The filter-free band-selective photodetection is realized by adjusting the difference in wavelengths between the transmission cut-off wavelength of the semiconducting light depletion layer and the absorption edge of the BHJ layer. For example, a filter-free visible-blind near-infrared OPD, with a spectral rejection ratio of 100, a high responsivity of 0.39 A W−1, a high −3 dB cutoff frequency of 80 kHz, and a fast response time of ≈7 µs, is demonstrated, offering an exciting option for a plethora of applications in imaging and light communications.

Original languageEnglish
Article number2001388
JournalAdvanced Optical Materials
Issue number24
Early online date23 Oct 2020
Publication statusPublished - 17 Dec 2020

Scopus Subject Areas

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

User-Defined Keywords

  • band-selective photodetection
  • filter-free photodetection
  • light communication
  • near-infrared absorption
  • organic photodetectors, photoactive layers


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