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Ji Li1, Dechao Guo1,2, Dezhi Yang1

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Researchers developed high-performance photomultiplication organic photodetectors (PM-OPDs) using HATCN dopant for efficient charge trapping. Optimized devices show high efficiency and detect narrowband light, showing potential for heart rate monitoring.

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Area of Science:

  • Organic electronics
  • Photodetector technology
  • Materials science

Background:

  • Organic photodetectors (OPDs) are crucial for light sensing.
  • Enhancing charge trapping is key to improving OPD performance.
  • Simple device structures are desirable for practical applications.

Purpose of the Study:

  • To investigate the effect of HATCN dopant on F16CuPc active layers in organic photodetectors.
  • To optimize HATCN concentration for enhanced device performance.
  • To explore the potential of these devices for specific applications like heart rate detection.

Main Methods:

  • Incorporation of HATCN dopant into the F16CuPc active layer.
  • Optimization of HATCN concentration.
  • Fabrication of photomultiplication organic photodetectors (PM-OPDs).
  • Integration of a filter film for spectral response control.

Main Results:

  • Efficient charge trapping was achieved by incorporating HATCN.
  • Device efficiency was markedly enhanced by optimizing HATCN concentration.
  • The optimized device demonstrated a maximum external quantum efficiency (EQE) exceeding 11,000% and a detectivity (D*) over 1.0 × 10^12 Jones.
  • A narrowband spectral response with a full width at half maximum (FWHM) of 70 nm was achieved using a filter film.

Conclusions:

  • HATCN doping is an effective strategy for fabricating high-performance PM-OPDs.
  • Optimized PM-OPDs exhibit excellent efficiency and detectivity.
  • The narrowband spectral response enables potential applications in human heart rate detection.