A High-Performance Solution-Processed Organic Photodetector for Near-Infrared Sensing

Jianfei Huang, Jaewon Lee, Joachim Vollbrecht, Viktor V. Brus, Alana L. Dixon, David Xi Cao, Ziyue Zhu, Zhifang Du, Hengbin Wang, Kilwon Cho, Guillermo C. Bazan, Thuc Quyen Nguyen

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)

Abstract

Sensitive detection of near-infrared (NIR) light enables many important applications in both research and industry. Current organic photodetectors suffer from low NIR sensitivity typically due to early absorption cutoff, low responsivity, and/or large dark/noise current under bias. Herein, organic photodetectors based on a novel ultranarrow-bandgap nonfullerene acceptor, CO1-4Cl, are presented, showcasing a remarkable responsivity over 0.5 A W−1 in the NIR spectral region (920–960 nm), which is the highest among organic photodiodes. By effectively delaying the onset of the space charge limited current and suppressing the shunt leakage current, the optimized devices show a large specific detectivity around 1012 Jones for NIR spectral region up to 1010 nm, close to that of a commercial Si photodiode. The presented photodetectors can also be integrated in photoplethysmography for real-time heart-rate monitoring, suggesting its potential for practical applications.

Original languageEnglish
Article number1906027
JournalAdvanced Materials
Volume32
Issue number1
DOIs
Publication statusPublished - Jan 1 2020
Externally publishedYes

Keywords

  • bulk heterojunctions
  • high responsivity
  • near-infrared
  • organic photodiodes
  • photodetectors

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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