Over 13% Efficient Organic Solar Cells Based on Low-Cost Pentacyclic A-DA′D-A-Type Nonfullerene Acceptor

Jiage Song, Fangfang Cai, Can Zhu, Honggang Chen, Qingya Wei, Dongxu Li, Chujun Zhang, Rui Zhang, Jun Yuan, Hongjian Peng*, Shu Kong So, Yingping Zou

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Recent studies have almost focused on finding active layer materials with extended π-conjugation structures for high-performance organic solar cells (OSCs). However, with the extension of conjugate length, the synthesis difficulty and cost of materials will increase. Achieving high efficiency while reducing material costs is a prerequisite for the commercialization of OSCs. Herein, two low-cost A-DA′D-A-type (where A and D represent an electron-withdrawing unit and an electron-donating unit, respectively) nonfullerene acceptors (Y25,Y26) are synthesized with pentacyclic fused backbone as the DA′D electron-deficient core and 5,6-difluoro-3-(dicyandiamethyl) indigo as the end groups. Compared with classical Y series acceptors with heptacyclic backbone, although Y25 and Y26 own the reduced conjugated length, they still show moderate performance (11.65% and 13.34%), and the cost of synthesis is significantly reduced. Therefore, we provide a new molecular design idea for commercially efficient nonfullerene OSCs acceptors. We also find that adding alkyl chains to the β site of thiophenes is beneficial to obtaining the reduced energetic disorder, dominant molecular stacking, and desirable morphology, which can facilitate charge carrier transport and prompt higher short-circuit current density (Jsc) as well as fill factor.

Original languageEnglish
Article number2100281
JournalSolar RRL
Volume5
Issue number8
Early online date26 May 2021
DOIs
Publication statusPublished - Aug 2021

Scopus Subject Areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

User-Defined Keywords

  • charge transport
  • energetic disorder
  • nonfullerene acceptors
  • side chains

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