TL;DR
Fraunhofer ISE has increased the efficiency of its III-V germanium solar module from 34.2% to 34.4% using innovative shingle-matrix interconnection. This development advances high-efficiency solar technology for terrestrial applications.
Fraunhofer ISE has increased the efficiency of its III-V germanium solar module from 34.2% to 34.4%, marking a new record for terrestrial solar cells based on space-grade technology.
The new efficiency was achieved using a combination of shingle-matrix technology and adapted triple-junction cells from Azur Space. The shingle-matrix approach involves cutting solar cells into narrow strips, which are then overlapped in a shingle pattern and bonded with electrically conductive adhesive (ECA). This configuration reduces shading, eliminates the need for traditional metal ribbons, and enhances active area utilization.
Fraunhofer ISE collaborated with a mechanical engineering partner to develop the shingle-matrix interconnection method, which is now being adopted in commercial module manufacturing. The module also features anti-reflective front glass supplied by Temicon. The triple-junction cells were adapted specifically for the terrestrial solar spectrum, leveraging space-grade components for higher performance.
Previously, Fraunhofer ISE set a record of 34.2% efficiency earlier this year using an 833 cm² module. The recent improvement underscores ongoing progress in high-efficiency solar cell technologies, following the achievement of 40% indoor efficiency for III-V cells earlier in 2025.
Implications for High-Efficiency Solar Technology
This efficiency milestone demonstrates significant progress in solar cell design, particularly in reducing shading losses and increasing active area utilization through innovative interconnection methods. The use of space-grade cells in terrestrial modules could accelerate the development of highly efficient, next-generation solar panels, potentially impacting large-scale solar power deployment and space applications alike.
While the record is a laboratory achievement, its commercial viability and scalability are still under evaluation. The adoption of shingle-matrix technology in manufacturing suggests a pathway toward more efficient modules, but further testing and validation are needed before widespread deployment.
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Advances in III-V and Ge-based Solar Cells
Fraunhofer ISE has been at the forefront of high-efficiency solar research, notably achieving 40% indoor efficiency for III-V cells earlier in 2025. The use of triple-junction cells from Azur Space, originally developed for space applications, has been adapted for terrestrial use, aiming to bridge the gap between laboratory efficiency and commercial deployment. The recent efficiency increase builds on prior records and reflects ongoing innovation in interconnection techniques and material integration.
Shingle-matrix technology, developed in collaboration with mechanical engineers, represents a significant shift from traditional soldered ribbons, offering potential for higher active area utilization and reduced shading losses. The development aligns with broader industry trends toward multi-junction, high-efficiency solar technologies capable of surpassing conventional silicon-based modules.
“The use of shingle-matrix technology allows us to significantly reduce shading and improve active area utilization, pushing the efficiency boundary further.”
— an anonymous researcher
Direct imaging of minority charge carrier transport in triple junction solar cell Layers
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Uncertainties About Commercial Scalability
It is not yet clear how quickly shingle-matrix technology will be adopted in mass production or whether the efficiency gains can be maintained at larger scales. Further testing is needed to confirm long-term stability and cost-effectiveness.
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Next Steps Toward Commercial Deployment
Fraunhofer ISE and partners are expected to conduct further validation and scaling tests to evaluate the manufacturability of shingle-matrix modules. Industry observers will monitor whether this technology can be integrated into commercial products and what impact it may have on the high-efficiency solar market.
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Key Questions
How does shingle-matrix technology improve solar module efficiency?
It reduces shading and eliminates traditional metal ribbons, increasing active area utilization and enabling higher efficiency.
Are these high-efficiency modules ready for commercial use?
While promising, further validation is needed to confirm scalability, long-term stability, and cost-effectiveness before commercial deployment.
What is the significance of using space-grade solar cells in terrestrial modules?
Space-grade cells offer higher performance and durability, which can translate into more efficient and longer-lasting terrestrial solar panels.
Will this technology impact the overall cost of solar panels?
Potentially, but it depends on manufacturing scalability and cost reduction in the production process. Further research is required to assess economic viability.
Source: PV Magazine
