Perovskite Solar Cells Reach New Heights in PerformanceNew Method Boosts Solar Cell Efficiency and Stability

Researchers have developed an innovative approach to mitigate halide segregation in mixed-halide perovskite solar cells, enhancing their stability and efficiency. This breakthrough was achieved by employing redox mediators based on anthraquinone compounds.

Metal halide perovskites, semiconductors that hold promise for next-generation photovoltaics, have shown significant efficiency improvements. Yet, the long-term performance of these materials has been compromised by phase segregation issues.

The team from City University of Hong Kong, in their study published in Nature Energy, proposes a solution that could significantly improve the durability and photovoltage of these solar cells. They developed multifunctional redox mediators that target the root cause of halide segregation, providing a path to more stable solar cells.

These newly designed redox mediators selectively reduce iodine while oxidizing metallic lead, addressing the oxidative processes that lead to phase segregation. This innovative strategy not only stabilizes the solar cells but also enhances their efficiency.

The effectiveness of the anthraquinone-based redox mediators was demonstrated in the development of wide-bandgap perovskite solar cells. These cells achieved a power conversion efficiency of 19.58% and exhibited impressive stability, retaining 95% of their initial efficiency after 500 hours of operation at maximum power.

Integrating these cells into tandem solar cells as a wide-bandgap subcell yielded an efficiency of 25.22%, with exceptional long-term operational stability. This represents a significant advancement in the field of perovskite solar cells, offering a viable solution to one of the key challenges facing the technology.

This research underscores the potential of perovskite-organic tandem solar cells to exceed the performance of current perovskite-based tandem solar cells, marking a step forward in the quest for sustainable energy solutions.

David Lamy
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