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High-Performance Nonfused Electron Acceptor with Precisely Controlled Side Chain Fluorination.

Kexin Yu1,2, Tao Zhou3, Wenting Liang1

  • 1State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, China.

ACS Applied Materials & Interfaces
|September 14, 2023
PubMed
Summary
This summary is machine-generated.

Fluorination of nonfullerene acceptors in organic solar cells enhances molecular packing and efficiency. Optimized side chain fluorination in DTCBT-F5 achieved a 12.7% power conversion efficiency, demonstrating a promising strategy for high-performance devices.

Keywords:
fluorinationmiscibilitymolecular orderingnonfused electron acceptorsorganic solar cells

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Photovoltaics

Background:

  • Nonfullerene acceptors (NFAs) are crucial for high-efficiency organic solar cells (OSCs).
  • Molecular packing and side chain engineering of NFAs significantly impact device performance.
  • Fluorination is a key strategy to tune the electronic and morphological properties of NFAs.

Purpose of the Study:

  • To design and synthesize novel nonfused electron acceptors (DTCBT-Fx, x=0, 5, 9) with controlled side chain fluorination.
  • To systematically investigate the effect of varying fluorine content on molecular packing, energy levels, and film morphology.
  • To optimize NFA structure for improved charge transport and reduced recombination in OSCs.

Main Methods:

  • Synthesis of three nonfused electron acceptors with different degrees of fluorination.
  • Characterization of photophysical properties, energy levels, and molecular ordering.
  • Fabrication and testing of organic solar cells using the synthesized NFAs with a PM6 donor polymer.
  • Analysis of film morphology and charge carrier dynamics.

Main Results:

  • Side chain fluorination effectively tuned light absorption, energy levels, molecular ordering, and film morphology.
  • DTCBT-F5 demonstrated optimal miscibility with the PM6 donor, leading to reduced charge recombination.
  • Improved charge carrier mobility was observed in DTCBT-F5 based devices.
  • A power conversion efficiency of 12.7% was achieved for DTCBT-F5 based OSCs, outperforming controls (11.4% and 11.6%).

Conclusions:

  • Precise control over side chain fluorination in nonfused electron acceptors is a viable strategy for enhancing OSC performance.
  • Optimized fluorination can lead to improved material properties and device efficiencies.
  • This study provides valuable insights for the rational design of next-generation NFAs for efficient organic solar cells.