Enhancing Open-Circuit Voltage of High-Efficiency Nonfullerene Ternary Solar Cells with a Star-Shaped Acceptor

Guilong Cai, Yuhao Li, Jiadong Zhou, Peiyao Xue, Kuan Liu, Jiayu Wang, Zengqi Xie, Gang Li, Xiaowei Zhan, Xinhui Lu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

2 Citations (Scopus)

Abstract

The ternary strategy has been widely used in high-efficiency organic solar cells (OSCs). Herein, we successfully incorporated a mid-band-gap star-shaped acceptor, FBTIC, as the third component into the PM6/Y6 binary blend film, which not only achieved a panchromatic absorption but also significantly improved the open-circuit voltage (VOC) of the devices due to the high-lying lowest unoccupied molecular orbital (LUMO) of the FBTIC. Morphology characterizations show that star-shaped FBTIC molecules are amorphously distributed in the ternary system, and the finely tuned ternary film morphology facilitates the exciton dissociation and charge collection in ternary devices. As a result, the best PM6/Y6/FBTIC-based ternary OSCs achieved a power conversion efficiency (PCE) of 16.7% at a weight ratio of 1.0:1.0:0.2.

Original languageEnglish
Pages (from-to)50660-50667
Number of pages8
JournalACS Applied Materials and Interfaces
Volume12
Issue number45
DOIs
Publication statusPublished - 11 Nov 2020

Keywords

  • fused-ring electron acceptor
  • nonfullerene acceptor
  • organic solar cell
  • star-shaped acceptor
  • ternary

ASJC Scopus subject areas

  • Materials Science(all)

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