A Terpolymer Acceptor Enabling All-Polymer Solar Cells with a Broad Donor:Acceptor Composition Tolerance and Enhanced Stability

Bin Liu, Junwei Wang, Huiliang Sun, Ziang Wu, Chao Yao, Qiaogan Liao, Zixiang Wei, Wanli Yang, Xianhe Zhang, Hong Meng, Han Young Woo, Xugang Guo

Research output: Contribution to journalArticlepeer-review

Abstract

Achieving a broad donor:acceptor (D:A) composition tolerance in efficient organic solar cells (OSCs) is important for printing large-area solar cell modules. Herein, all-polymer solar cells (all-PSCs) based on new terpolymer acceptors and a well-known polymer donor PTB7-Th are fabricated to explore the effect of D:A ratio on morphology and photovoltaic performances. The all-PSCs show a promising power conversion efficiency (PCE) of 7.23% with an optimum D:A ratio of 1:2 and retain over 40% of its optimal PCE with ultrabroad D:A composition tolerance from 1:30 to 10:1. In addition, the all-PSCs can maintain 90% of its original PCE after 400 h of storage despite such broad range of D:A ratio, which is much better than those of other types of OSCs and even better than the benchmark all-polymer system with N2200 as the acceptor under the same condition. The results show the superiority of the all-PSCs in terms of D:A ratio tolerance and performance stability, which should be conducive to practical applications of all-PSCs.

Original languageEnglish
JournalSolar RRL
DOIs
Publication statusAccepted/In press - 2020

Keywords

  • all-polymer solar cells
  • film morphology
  • high donor:acceptor ratio tolerance
  • n-type terpolymers

ASJC Scopus subject areas

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

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