Backbone Coplanarity Tuning of 1,4-Di(3-alkoxy-2-thienyl)-2,5-difluorophenylene-Based Wide Bandgap Polymers for Efficient Organic Solar Cells Processed from Nonhalogenated Solvent

Qiaogan Liao, Kun Yang, Jianhua Chen, Chang Woo Koh, Yumin Tang, Mengyao Su, Yang Wang, Yinhua Yang, Xiyuan Feng, Zhubing He, Han Young Woo, Xugang Guo

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Halogenated solvents are prevailingly used in the fabrication of nonfullerene organic solar cells (NF-OSCs) at the current stage, imposing significant restraints on their practical applications. By copolymerizing phthalimide or thieno[3,4-c]pyrrole-4,6-dione (TPD) with 1,4-di(3-alkoxy-2-thienyl)-2,5-difluorophenylene (DOTFP), which features intramolecular noncovalent interactions, the backbone planarity of the resulting DOTFP-based polymers can be effectively tuned, yielding distinct solubilities, aggregation characters, and chain packing properties. Polymer DOTFP-PhI with a more twisted backbone showed a lower degree of aggregation in solution but an increased film crystallinity than polymer DOTFP-TPD. An organic thin-film transistor and NF-OSC based on DOTFP-PhI, processed with a nonhalogenated solvent, exhibited a high hole mobility up to 1.20 cm2 V-1 s-1 and a promising power conversion efficiency up to 10.65%, respectively. The results demonstrate that DOTFP is a promising building block for constructing wide bandgap polymers and backbone coplanarity tuning is an effective strategy to develop high-performance organic semiconductors processable with a nonhalogenated solvent.

Original languageEnglish
Pages (from-to)31119-31128
Number of pages10
JournalACS Applied Materials and Interfaces
Volume11
Issue number34
DOIs
Publication statusPublished - 2019 Aug 28

Keywords

  • backbone coplanarity
  • noncovalent interaction
  • nonfullerene organic solar cells
  • nonhalogenated solvent
  • organic field-effect transistors

ASJC Scopus subject areas

  • Materials Science(all)

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