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Dark Current Reduction Strategy via a Layer-By-Layer Solution Process for a High-Performance All-Polymer

Zhiming Zhong1, Laju Bu2, Peng Zhu1

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PubMed
Summary
This summary is machine-generated.

We developed an all-polymer photodetector with a unique segregated bulk-heterojunction. This design significantly reduces dark current and enhances specific detectivity for high-performance organic photodetectors.

Keywords:
all-polymer photodetectorgradient bulk heterojunctionimide functionalized benzotriazolelayer-by-layer processnoise spectral density

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Area of Science:

  • Organic electronics
  • Photodetector technology
  • Materials science

Background:

  • High-performance organic photodetectors require specific bulk-heterojunction morphologies to minimize leaking current.
  • Vertically gradient structures are preferred for suppressing dark current in organic photodetector designs.

Purpose of the Study:

  • To demonstrate an all-polymer photodetector featuring a segregated bulk-heterojunction active layer.
  • To investigate the impact of this structure on photodetector performance, particularly dark current and specific detectivity.

Main Methods:

  • Fabrication of an all-polymer photodetector using a layer-by-layer solution process.
  • Characterization of the photodetector's active layer morphology as a segregated bulk-heterojunction.
  • Measurement of dark current density, responsivity, and specific detectivity.

Main Results:

  • The all-polymer photodetector exhibited a dramatically reduced dark current density due to a built-in charge blocking layer.
  • Achieved responsivity of 0.25 A/W at ~600 nm.
  • Calculated specific detectivity of 5.68 × 10^12 cm Hz^1/2 W^-1 at 1 kHz.

Conclusions:

  • The segregated bulk-heterojunction in an all-polymer photodetector effectively suppresses dark current.
  • The demonstrated photodetector shows among the best performances for polymer-based devices.
  • This approach offers a facile method for enhancing polymer photodetector specific detectivity.