Fused Benzothiadiazole: A Building Block for n-Type Organic Acceptor to Achieve High-Performance Organic Solar Cells

Jun Yuan, Yunqiang Zhang, Liuyang Zhou, Chujun Zhang, Tsz Ki Lau, Guichuan Zhang, Xinhui Lu, Hin Lap Yip, Shu Kong SO, Serge Beaupré, Mathieu Mainville, Paul A. Johnson, Mario Leclerc, Honggang Chen, Hongjian Peng, Yongfang Li*, Yingping Zou

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

155 Citations (Scopus)

Abstract

Narrow bandgap n-type organic semiconductors (n-OS) have attracted great attention in recent years as acceptors in organic solar cells (OSCs), due to their easily tuned absorption and electronic energy levels in comparison with fullerene acceptors. Herein, a new n-OS acceptor, Y5, with an electron-deficient-core-based fused structure is designed and synthesized, which exhibits a strong absorption in the 600–900 nm region with an extinction coefficient of 1.24 × 10 5 cm −1 , and an electron mobility of 2.11 × 10 −4 cm 2 V −1 s −1 . By blending Y5 with three types of common medium-bandgap polymers (J61, PBDB-T, and TTFQx-T1) as donors, all devices exhibit high short-circuit current densities over 20 mA cm −2 . As a result, the power conversion efficiency of the Y5-based OSCs with J61, TTFQx-T1, and PBDB-T reaches 11.0%, 13.1%, and 14.1%, respectively. This indicates that Y5 is a universal and highly efficient n-OS acceptor for applications in organic solar cells.

Original languageEnglish
Article number1807577
JournalAdvanced Materials
Volume31
Issue number17
DOIs
Publication statusPublished - 25 Apr 2019

Scopus Subject Areas

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

User-Defined Keywords

  • electron-deficient core
  • fused benzothiadiazole
  • nonfullerene acceptors
  • organic photovoltaics
  • power conversion efficiency

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