Soitec revealed that under a solar concentration of 319, the cell reached this remarkable efficiency. The company also noted that when the light concentration is between 250 and 500, the efficiency of the four-junction cell surpasses 43%. According to Soitec, this innovation has the potential to outperform traditional three-junction solar cells, pushing the boundaries of what’s possible in photovoltaics.

André-Jacques Auberton-Hervé, CEO of Soitec, emphasized the importance of this breakthrough: “This efficiency gain represents a crucial step beyond the traditional economics of solar power. This achievement brings immense value to our solar energy business and validates our long-term strategy and business model.”

The company highlighted its collaboration with two leading research institutions—Fraunhofer ISE and CEA-Leti—in developing this technology. Auberton-Hervé added, “Working with these top-tier organizations has allowed us to make rapid progress. Looking ahead, we aim to continue refining this concept and hope to reach a 50% efficiency level in solar cells by 2015.”

The four-junction design incorporates two dual-junction subcells, each grown on a separate III-V compound semiconductor. This unique structure allows the cell to capture a broader range of the solar spectrum by adjusting the bandgap. Soitec utilized its proprietary semiconductor bonding and layer transfer technology, a method that has been widely used in the semiconductor industry for many years, to create this advanced photovoltaic cell.

This project was developed in partnership with Fraunhofer ISE, the Helmholtz Center for Materials and Energy, and CEA-Leti, based in Grenoble, France. Together, these institutions have contributed to a major advancement in renewable energy technology, paving the way for more efficient and sustainable solar solutions.

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