Interfacial Engineering for Photomultiplication Type Organic Photodetectors with Signal-Noise-Ratio Over 89 000

Ming Liu, Qi Yao, Shipei Li, Yunke Qin, Sang Young Jeong, Yao Ma, Liang Shen, Xiaoling Ma, Kaixuan Yang, Guangcai Yuan, Han Young Woo, Fujun Zhang

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Photomultiplication type organic photodetectors (PM-OPDs) exhibit obvious superiority in weak light detection due to their low dark current density (JD) and large photo-induced current density (JPI). The JD is one of the important parameters that influences light detection sensitivity of PM-OPDs, how to effectively suppress the JD is a great challenge to improve the performance of PM-OPDs. In this work, the JD of PM-OPDs can be suppressed by employing PTAA or doped-PTAA as the interfacial layer replacing PEDOT:PSS layer. The PM-OPDs with PTAA layer exhibit a low JD of 2.3 × 10−7 A cm−2 under −6 V bias, which is much smaller than 1.4 × 10−6 A cm−2 for PM-OPDs with PEDOT:PSS layer. The small molecule DRCN5T is incorporated into PTAA to further passivate surficial defects of PTAA films, which is conducive to reducing the leakage current of PM-OPDs. The optimal PM-OPDs exhibit rather low JD of 8.4 × 10−8 A cm−2 under −6 V bias, as well as external quantum efficiency (EQE) of 31700% and specific detectivity (D*) of 1.2 × 1013 Jones at 370 nm. The signal-noise-ratio of optimal PM-OPDs arrives to 89600 under −4.5 V bias under white light illumination with intensity of 1.5 mW cm−2.

Original languageEnglish
JournalAdvanced Optical Materials
DOIs
Publication statusAccepted/In press - 2024

Bibliographical note

Publisher Copyright:
© 2024 Wiley-VCH GmbH.

Keywords

  • dark current density
  • external quantum efficiency
  • organic photodetectors
  • photomultiplication

ASJC Scopus subject areas

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

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