Triple-Junction Perovskite Solar Cell Hits 27.3% Efficiency, Lasts 770 Hours

German researchers have developed a triple-junction perovskite solar cell that achieves 27.3% efficiency and maintains stable performance for 770 hours, marking a step toward commercial viability.

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A team of German researchers has achieved a new milestone in solar energy technology by developing a triple-junction perovskite solar cell that reaches 27.3% efficiency. The device also demonstrated stable performance over 770 continuous operating hours, addressing two key challenges that have hindered perovskite solar cells: efficiency and durability.

The breakthrough, reported by Interesting Engineering, involves stacking three perovskite layers to capture a broader spectrum of sunlight. Each layer is tuned to absorb different wavelengths, allowing the cell to convert more solar energy into electricity than single-junction designs. This triple-junction architecture is a departure from conventional single-layer perovskite cells, which typically have lower efficiencies.

The research team focused on improving both the power conversion efficiency and the operational lifetime of the cell. The 27.3% efficiency figure places the cell among the highest reported for perovskite-based devices. Meanwhile, the 770-hour stable operation indicates that the cell can withstand prolonged use without significant degradation, a common weakness of earlier perovskite cells.

These advances bring perovskite solar technology closer to practical commercial applications. Perovskites are attractive because they can be manufactured using low-cost, scalable processes, unlike traditional silicon cells. However, issues with stability and efficiency have delayed their market entry. The German team's work suggests that triple-junction designs could overcome these hurdles.

The researchers did not disclose specific materials or fabrication methods in the available summary, but the results have been published in a scientific venue. Further details are expected to emerge as the work undergoes peer review and wider dissemination.