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Photochemical Electrocyclic Reactions: Stereochemistry01:26

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Highly-Efficient 2D Nonfullerene Acceptors Enabled by Subtle Molecular Tailoring Engineering.

Yafei Ding1, Shilong Xiong1, Mingpeng Li1

  • 1Shenzhen Grubbs Institute and Department of Chemistry, Southern University of Science and Technology, Shenzhen, 518055, China.

Small (Weinheim an Der Bergstrasse, Germany)
|December 10, 2023
PubMed
Summary
This summary is machine-generated.

Researchers enhanced organic solar cell performance by designing new nonfullerene acceptors with a 2D π-conjugate expansion strategy. This approach improved efficiency, achieving 17.05% power conversion efficiency in devices.

Keywords:
2D conjugate expansionaromatic‐ring substitutionnonfullerene acceptororganic solar cellpower conversion efficiency

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Photovoltaics

Background:

  • Nonfullerene acceptors (NFAs) are crucial for high-performance organic solar cells (OSCs).
  • Conjugate expansion strategies in NFAs can tune morphology and molecular stacking.
  • Optimizing molecular design is key to enhancing OSC performance.

Purpose of the Study:

  • To design and synthesize novel 2D nonfullerene acceptors using a π-conjugate expansion strategy.
  • To investigate the impact of aromatic-ring substitution on electronic structure and aggregation behavior.
  • To develop highly efficient organic solar cells.

Main Methods:

  • Synthesis of two nonfullerene acceptors, YB2B and YB2T, via a 2D π-conjugate expansion strategy.
  • Characterization of spectral absorption, charge transport properties, and intermolecular stacking.
  • Fabrication and testing of organic solar cell devices using the synthesized NFAs.

Main Results:

  • YB2T exhibited red-shifted spectral absorption and superior charge transport compared to YB2B.
  • YB2T demonstrated more orderly and tightly packed intermolecular stacking, leading to optimized blend film morphology.
  • YB2T-based OSCs achieved a power conversion efficiency (PCE) of 17.05%, significantly outperforming YB2B-based devices (10.94%).
  • YB2T-based films showed enhanced exciton dissociation and reduced charge recombination.

Conclusions:

  • Aromatic-ring substitution is a significant strategy for regulating the electronic structure and aggregation behavior of 2D NFAs.
  • The 2D π-conjugate expansion strategy effectively enhances organic photovoltaic performance.
  • The developed YB2T nonfullerene acceptor offers a promising pathway for next-generation high-efficiency organic solar cells.