High-Performance Ternary Organic Solar Cells through Incorporation of a Series of A2-A1-D-A1-A2Type Nonfullerene Acceptors with Different Terminal Groups

Ai Lan, Yifan Lv, Jintao Zhu, Hong Lu, Hainam Do, Zhi Kuan Chen, Jialing Zhou, Helin Wang, Fei Chen, Erjun Zhou

Research output: Journal PublicationArticlepeer-review

3 Citations (Scopus)

Abstract

A ternary strategy has been considered to be a simple and efficient method to further improve the performance of organic solar cells (OSCs). Here, three benzotriazole-based nonfullerene acceptors (NFAs) with similar A2-A1-D-A1-A2 backbones except for different terminal groups, are utilized as guest components to a classic PM6:BTP-BO-4F binary host. Excitingly, BTA1-3 all realize much better photovoltaic performance in ternary devices with a minimized energy loss (Eloss) and improved open-circuit voltage (VOC), suggesting that it is the bridge A1 unit that plays the decisive role. Additionally, the short-circuit current density (JSC) and fill factor (FF) of BTA2-/BTA3-incorporated devices can be enhanced simultaneously, resulting from more efficient photon harvesting, increased exciton dissociation, improved charge transport, and reduced charge recombination. The highest efficiency of 18.27% is obtained in the BTA2 device, one of the top values for PM6-based OSCs. This work suggests that A2-A1-D-A1-A2 type NFAs are effective in further improving the performance of ternary OSCs.

Original languageEnglish
Pages (from-to)2845-2855
Number of pages11
JournalACS Energy Letters
Volume7
Issue number8
DOIs
Publication statusPublished - 12 Aug 2022

ASJC Scopus subject areas

  • Chemistry (miscellaneous)
  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Materials Chemistry

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