Nonfullerene-based organic photodetectors for ultrahigh sensitivity visible light detection

Nicola Gasparini, Helen Bristow, Polina Jacoutot, Alberto D. Scaccabarozzi, Maxime Babics, Maximilian Moser, Andrew Wadsworth, Thomas D. Anthopoulos, Artem Bakulin, Iain McCulloch

Research output: Contribution to journalArticlepeer-review

39 Scopus citations

Abstract

It is well established that for organic photodetectors (OPDs) to compete with their inorganic counterparts, low dark currents at reverse bias must be achieved. Here, two rhodanine-terminated nonfullerene acceptors O-FBR and O-IDTBR are shown to deliver low dark currents at -2 V of 0.17 and 0.84 nA cm-2, respectively, when combined with the synthetically scalable polymer PTQ10 in OPD. These low dark currents contribute to the excellent sensitivity to low light of the detectors, reaching values of 0.57 μW cm-2 for PTQ10:O-FBR-based OPD and 2.12 μW cm-2 for PTQ10:O-IDTBR-based OPD. In both cases, this sensitivity exceeds that of a commercially available silicon photodiode. The responsivity of the PTQ10:O-FBR-based OPD of 0.34 AW-1 under a reverse bias of -2 V also exceeds that of a silicon photodiode. Meanwhile, the responsivity of the PTQ10:O-IDTBR of 0.03 AW-1 is limited by the energetic offset of the blend. The OPDs deliver high specific detectivities of 9.6 × 1012 Jones and 3.3 × 1011 Jones for OFBR- and O-IDTBR-based blends, respectively. Both active layers are blade-coated in air, making them suitable for high-throughput methods. Finally, all three of the materials can be synthesized at low cost and on a large scale, making these blends good candidates for commercial OPD applications.

Original languageEnglish (US)
Pages (from-to)48836-48844
Number of pages9
JournalACS Applied Materials and Interfaces
Volume12
Issue number43
DOIs
StatePublished - Oct 28 2020
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Materials Science

Keywords

  • High sensitivity
  • Nonfullerene acceptors
  • Organic photodetectors
  • Scalable fabrication method
  • Visible detection

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