New roles of fused-ring electron acceptors in organic solar cells

Huan Cao, Dashan Qin, Jing Wang, Tengfei Li, Jingshuai Zhu, Haotian Jiang, Mingyu Zhang, Kuan Liu, Zheng Tang, Xiaowei Zhan

Research output: Journal article publicationJournal articleAcademic researchpeer-review

3 Citations (Scopus)

Abstract

Recently, we developed fused-ring electron acceptors (FREAs) as a class of high-performance nonfullerene acceptors, which have been widely used in organic solar cells (OSCs). Here, we explore new functions of FREAs in addition to being an acceptor in a photoactive layer, and use them as an interfacial layer, which significantly improves the performance of OSCs. Compared with the conventional cathode modifying layers (CMLs) of ZnO and ZnO/polyethylenimine ethoxylated (PEIE), a novel CML of ZnO/FREA/PEIE enhances the optical mode and absorption of the device and suppresses geminate recombination via charge separation, both of which increase the short-circuit current density. In addition, FREAs passivate the surface defects of ZnO and then facilitate electron transport. The OSCs based on ZnO/FREA/PEIE exhibit a power conversion efficiency of 13.04%, higher than those based on ZnO and ZnO/PEIE (12.15% and 12.12%).

Original languageEnglish
Pages (from-to)4766-4770
Number of pages5
JournalJournal of Materials Chemistry A
Volume7
Issue number9
DOIs
Publication statusPublished - Jan 2019

ASJC Scopus subject areas

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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