Fluorine Substituted Bithiophene Imide-Based n-Type Polymer Semiconductor for High-Performance Organic Thin-Film Transistors and All-Polymer Solar Cells

Huiliang Sun, Yumin Tang, Han Guo, Mohammad Afsar Uddin, Shaohua Ling, Ruizhi Wang, Yingfeng Wang, Xin Zhou, Han Young Woo, Xugang Guo

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)

Abstract

Bithiophene imide (BTI) is a promising building block for constructing n-type organic semiconductors. The β-positions of thiophene in BTI offer an exceptional opportunity for further structural expansion and optimization. Herein, a novel fluorinated BTI, s-FBTI2, is designed and successfully synthesized, and its incorporation into a polymer backbone led to the resulting semiconductor s-FBTI2-FT with improved polymer backbone planarity enabled by the intramolecular non-covalent S···F interactions and optimized electronic structure attributed to the high electronegativity of F atoms. When applied in organic thin-film transistors (OTFTs), s-FBTI2-FT shows a unipolar n-type transport with a remarkable electron mobility approaching 3.0 cm2 V−1 s−1, which is >3-fold higher than that of the polymer analogue without F. Moreover, all-polymer solar cells (all-PSCs) with s-FBTI2-FT as the electron acceptor polymer achieve a power conversion efficiency of 6.50% with a remarkably high open-circuit voltage of 1.04 V, which is substantially greater than that of solar cells based on the nonfluorinated analogue acceptor showing negligible photovoltaic performance. The results demonstrate that s-FBTI-FT is one of best-performing n-type polymer semiconductors reported till today in terms of both OTFT and all-PSC performances, and fluorination offers an effective approach for optimizing optoelectronic properties of BTI-based polymers for device performance improvement.

Original languageEnglish
Article number1800265
JournalSolar RRL
Volume3
Issue number2
DOIs
Publication statusPublished - 2019 Feb 1

Keywords

  • all-polymer solar cells
  • fluorination
  • imide-functionalized n-type polymers
  • organic electronics
  • organic thin-film transistor

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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