Enhancing the performance of non-fullerene organic solar cells via end group engineering of fused-ring electron acceptors

Cenqi Yan, Wei Wang, Tsz Ki Lau, Kejia Li, Jiayu Wang, Kuan Liu, Xinhui Lu, Xiaowei Zhan

Research output: Journal article publicationJournal articleAcademic researchpeer-review

36 Citations (Scopus)

Abstract

A fused heptacyclic electron acceptor, ITIC5, based on a benzodi(cyclopentadithiophene) core flanked by thiophene-fused termini, is designed, synthesized, and compared with its benzene-fused analogue, ITIC1. ITIC5 with thiophene-fused termini exhibits a narrower optical band gap, stronger and redshifted absorption, and higher electron mobility than ITIC1. The active layer consisting of a wide-bandgap polymer donor J71 and ITIC5 exhibits a smaller acceptor domain, stronger crystallinity, and higher and more balanced mobilities than its J71:ITIC1 counterpart, contributing to efficient exciton dissociation and charge transport. J71:ITIC5 based organic solar cells exhibit a high fill factor of 75.5% and a champion power conversion efficiency of 12.5%, a nearly 40% boost in efficiency with respect to the ITIC1-based control device, suggesting that the thiophene-fused end group has great potential for constructing high-performance fused-ring electron acceptors.

Original languageEnglish
Pages (from-to)16638-16644
Number of pages7
JournalJournal of Materials Chemistry A
Volume6
Issue number34
DOIs
Publication statusPublished - Jul 2018

ASJC Scopus subject areas

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

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