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A Coupled Organic Solar Battery with 12.1% Efficiency.

Xiang Zhang1,2,3, Lei Jiao1,3, Weiqiang Guo1

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Researchers developed high-efficiency coupled organic solar batteries using molecular photoelectrochemical materials. These batteries utilize a wider solar spectrum for improved solar-to-electrochemical energy storage, showing commercial viability.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Renewable Energy

Background:

  • Direct solar-to-electrochemical energy storage (coupled solar batteries) offers promise but suffers from low efficiencies.
  • Current limitations stem from insufficient utilization of the broad solar spectrum.
  • Molecular photoelectrochemical materials present a potential avenue for improvement.

Purpose of the Study:

  • To develop wide-spectrum, high-efficiency coupled organic solar batteries.
  • To enhance solar energy conversion and storage using novel molecular materials and exciton-coupled redox reactions.
  • To demonstrate the commercial viability of these advanced solar battery systems.

Main Methods:

  • Prescreening molecular materials for optimal redox potential matching with visible light photovoltage.
  • Utilizing strong donor-acceptor structures and ion polarization for long-lived superband gap excitons (hot excitons).
  • Incorporating photothermal molecular motifs for near-infrared light utilization via photothermal exciton-photon coupling.

Main Results:

  • Achieved a record solar-to-electrochemical energy storage efficiency of 12.1%.
  • Obtained a high exchange photocurrent of 11.2 mA cm-2 at 0.93 V under full-spectrum illumination.
  • Demonstrated long-term stable operation of an upscalable tandem device (∼200 cm2) under natural sunlight.

Conclusions:

  • Exciton-coupled redox reactions over tailored molecular photoelectrochemical materials enable wide-spectrum, high-efficiency solar energy storage.
  • The developed coupled organic solar batteries show significant potential for practical, commercially viable applications.
  • This approach overcomes previous limitations in solar spectrum utilization for energy storage systems.