Ternary organic photodetectors based on pseudo-binaries nonfullerene-based acceptors

Tianyi Zhang, Maximilian Moser, Alberto D. Scaccabarozzi, Helen Bristow, Polina Jacoutot, Andrew Wadsworth, Thomas D. Anthopoulos, Iain McCulloch, Nicola Gasparini

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

The addition of a third component to a donor:acceptor blend is a powerful tool to enhance the power conversion efficiency of organic solar cells. Featuring a similar operating mechanism, organic photodetectors are also expected to benefit from this approach. Here, we fabricated ternary organic photodetectors, based on a polymer donor and two nonfullerene acceptors, resulting in a low dark current of 0.42 nA cm2 at −2 V and a broadband specific detectivity of 1012 Jones. We found that exciton recombination in the binary blend is reduced in ternary devices due to the formation of a pseudo-binary microstructure with mixed donor–acceptor phases. With this approach a wide range of intermediate open-circuit voltages is accessible, without sacrificing light-to-current conversion. This results in ternary organic photodetector (TOPD) with improved Responsivity values in the near-infrared. Moreover, morphology analyses reveal that TOPD devices showed improved microstructure ordering and consequentially higher charge carrier mobilities compared to the reference devices.

Original languageEnglish (US)
Article number045001
JournalJPhys Materials
Volume4
Issue number4
DOIs
StatePublished - Oct 2021
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • General Materials Science
  • Condensed Matter Physics

Keywords

  • Miscibility
  • Nonfullerene acceptors
  • Organic photodetectors
  • Scalable fabrication method
  • Ternary blends

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