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Title: A High‐Performance Solution‐Processed Organic Photodetector for Near‐Infrared Sensing

Journal Article · · Advanced Materials
ORCiD logo [1];  [1];  [2];  [2];  [2];  [2];  [1];  [2];  [3];  [4];  [1];  [1]
  1. Center for Polymers and Organic Solids University of California Santa Barbara CA 93106 USA, Mitsubishi Chemical Center for Advanced Materials Materials Research Laboratory University of California Santa Barbara CA 93106 USA
  2. Center for Polymers and Organic Solids University of California Santa Barbara CA 93106 USA
  3. Mitsubishi Chemical Center for Advanced Materials Materials Research Laboratory University of California Santa Barbara CA 93106 USA
  4. Center for Advanced Soft Electronics Department of Chemical Engineering Pohang University of Science and Technology Pohang 37673 Republic of Korea
+ Show Author Affiliations

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 10 12 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.

Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1574038
Journal Information:
Advanced Materials, Journal Name: Advanced Materials Journal Issue: 1 Vol. 32; ISSN 0935-9648
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English

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