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Solid Additive Enables Organic Solar Cells with Efficiency up to 18.6.

Hao Guan1, Qiaogan Liao1, Tianhuan Huang1

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ACS Applied Materials & Interfaces
|May 16, 2023
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Summary

A small molecule additive, BTA3, significantly enhances organic solar cell (OSC) performance by optimizing film morphology and charge dynamics. This solid additive strategy boosts energy conversion efficiency in PM6:BTP-eC9 based devices.

Keywords:
charge collectionenergy transfermorphologyorganic solar cellssolid additive

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Renewable Energy

Background:

  • Additive strategies are crucial for improving organic solar cell (OSC) performance.
  • Limited research exists on solid additives for OSCs, indicating a need for further exploration of their structure-property relationships.

Purpose of the Study:

  • To investigate the efficacy of a small molecule, BTA3, as a solid additive in PM6:BTP-eC9 based organic solar cells.
  • To understand how BTA3 influences thin-film morphology and optoelectronic properties.
  • To reveal the relationship between BTA3 content and device performance.

Main Methods:

  • Fabrication of organic solar cells using PM6:BTP-eC9 active layers with varying concentrations of BTA3.
  • Morphological characterization of the active layers.
  • Evaluation of photovoltaic performance and device parameters.

Main Results:

  • Achieved a high energy conversion efficiency of 18.65% in OSCs incorporating BTA3.
  • BTA3 demonstrated excellent compatibility with the BTP-eC9 acceptor, leading to optimized thin-film morphology.
  • A small addition of BTA3 (5 wt%) effectively promoted exciton dissociation and charge transfer while suppressing charge recombination.

Conclusions:

  • The small molecule BTA3 is an effective solid additive for enhancing the performance of organic solar cells.
  • BTA3 offers a promising strategy for developing high-efficiency OSCs through morphological control and improved charge dynamics.