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Balanced Crystallization Enhances Morphology and Efficiency in Binary Organic Solar Cells.

Ni Gao1, Panpan Zhang1, Zhigang Xu1

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Small (Weinheim an Der Bergstrasse, Germany)
|April 21, 2025
PubMed
Summary

2,7-dibromonaphthalene (DBN) solid additive optimizes organic solar cell (OSC) morphology by balancing crystallization. This enhances performance, achieving a 19.0% power conversion efficiency for PM6:Y6 devices.

Keywords:
2,7‐dibromonaphthalenebalanced crystallizationmorphologyorganic solar cellssolid additive

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Photovoltaics

Background:

  • High-performance organic solar cells (OSCs) require precise morphology control.
  • Challenges exist in optimizing crystallization kinetics and interfacial compatibility between polymer donors and small-molecule acceptors.

Purpose of the Study:

  • To introduce 2,7-dibromonaphthalene (DBN) as a solid additive for morphology regulation in PM6:Y6 organic solar cells.
  • To investigate the effect of DBN on crystallization and photovoltaic performance.

Main Methods:

  • Utilized 2,7-dibromonaphthalene (DBN) as a solid additive in the PM6:Y6 system.
  • Analyzed the impact of DBN on donor and acceptor phase crystallization.
  • Incorporated an anti-reflection MgF2 layer to further enhance device efficiency.

Main Results:

  • DBN achieved balanced crystallization, improving PM6 order and mitigating Y6 aggregation.
  • Enhanced light absorption, exciton dynamics, and charge transport were observed.
  • Achieved a power conversion efficiency (PCE) of 18.5%, with a VOC of 0.848 V, JSC of 28.15 mA cm-2, and FF of 77.7% in DBN-treated OSCs.
  • An additional MgF2 layer boosted the PCE to 19.0%.

Conclusions:

  • DBN effectively regulates morphology in PM6:Y6 organic solar cells.
  • This strategy offers a robust approach for advancing high-performance photovoltaic applications.