High-Performance Mid-Bandgap Fused-Pyrene Electron Acceptor

Guilong Cai, Peiyao Xue, Zhenyu Chen, Tengfei Li, Kuan Liu, Wei Ma, Jiarong Lian, Pengju Zeng, Yiping Wang, Ray P.S. Han, Xiaowei Zhan

Research output: Journal article publicationJournal articleAcademic researchpeer-review

32 Citations (Scopus)

Abstract

A new mid-bandgap nonfullerene acceptor, FPIC, is designed and synthesized on the basis of a novel fused-pyrene electron-donating core. FPIC exhibits intense light absorption between 500 and 750 nm, with a maximum molar extinction coefficient of 2.3 × 105 M-1 cm-1 at 645 nm, a medium optical bandgap of 1.63 eV, and a high electron mobility of 1.7 × 10-3 cm2 V-1 s-1. The ternary blend organic solar cells (OSCs) consisting of low-bandgap donor PTB7-Th, ultra-narrow-bandgap nonfullerene acceptor F8IC, and FPIC yield a high power conversion efficiency (PCE) of 13.0%, significantly surpassing the PCE value of the PTB7-Th/F8IC binary blend OSCs (9.55%). The ternary blend exhibits complementary absorption, effective exciton dissociation, balanced charge transport, and reduced charge recombination, leading to the improvement in open-circuit voltage, short-circuit current density, and fill factor relative to those of its PTB7-Th/F8IC counterpart. This work indicates that the mid-bandgap fused-pyrene electron acceptor FPIC is a promising third component for enhancing the photovoltaic performance of low-bandgap donor/acceptor binary blends.

Original languageEnglish
Pages (from-to)6484-6490
Number of pages7
JournalChemistry of Materials
Volume31
Issue number17
DOIs
Publication statusPublished - 10 Sep 2019

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

Cite this