Converting one-third of sunlight into electricity was long considered a practical limit for modern solar technology. Fraunhofer Institute for Solar Energy Systems in Freiburg has now surpassed this at 34.4 percent, the highest efficiency ever measured for a solar module globally. The decisive step beyond the previous 34.2-percent record came not from new materials but from an idea borrowed from roofing: solar cells overlapping like roof shingles, casting no shadow.
Shingles Instead of Copper Ribbons
Conventional solar modules connect individual cells via tinned copper ribbons. These ribbons collect current but lie on the active cell edge, shadowing part of the light-sensitive surface, a small but measurable loss in every conventionally connected module. For high-efficiency cells costing thousands per square meter depending on application, every shadowed area hits hard.
Shingle-matrix technology eliminates this loss through a complete rethink of module architecture. Researchers cut AZUR SPACE Solar Power's III-V germanium cells into narrow strips and layered them overlapping like roof shingles shedding water. Electrically conductive adhesives bond the strips directly, without copper ribbons, without shadowing. Every available cell surface absorbs light. Additionally, Freiburg-based temicon supplied antireflection structures for the front glass, reducing reflection losses further.
The result: an 833-square-centimeter module at 34.4-percent efficiency, certified and globally unmatched. Compared to the previous 34.2-percent record the same team achieved in February 2026 under the "Vorfahrt" research project, the improvement comes entirely from optimized interconnection, not better cells. Fraunhofer ISE has already integrated shingle-matrix technology into a pilot production line for silicon solar roof tiles that began operation in 2025. The connection method is identical, the cells more affordable.
Satellite Technology for Your Roof
The path of the deployed solar cells begins not on a roof but in space. AZUR SPACE Solar Power in Heilbronn has developed solar cells for geostationary satellites and space probes for decades. In orbit, every square centimeter counts. Production costs rank secondary. The triple-layer III-V semiconductor and germanium cells that AZUR SPACE produces for space achieve efficiency levels fundamentally unattainable with silicon technology.
In the "Vorfahrt" research project (abbreviation for cost reduction of III-V cells and modules for aerospace and vehicle applications), AZUR SPACE adapted its space cells to the terrestrial solar spectrum, which differs from orbital conditions. ISE Director Andreas Bett described the application target: integrated photovoltaics for building facades, vehicles, and specialized infrastructure, wherever maximum efficiency justifies the high price because space is limited. This market isn't mass field installation but the niche where research efficiency translates directly into product. This market is not mass field installation but the niche where research efficiency translates directly into product.
World Record from the Country Without Solar Factories
The Freiburg record sits in a paradoxical context: Germany leads global solar research but solar manufacturing in the country is dissolving.
In the first three quarters of 2025, German solar module production fell 60.6 percent. Meyer Burger, long the last relevant European high-efficiency module manufacturer, filed for insolvency at its German subsidiaries; production ended 2025. Solarwatt closed its Dresden plant, Aleo Solar announced production shutdown in Prenzlau. Eighty-eight percent of solar systems imported to Germany came from China in 2025. China dominates the entire value chain with over 70 percent world market share, from polysilicon (where China holds roughly ninety-five percent) to finished modules.
Freiburg's research records don't immediately change this reality. III-V germanium modules remain confined to specialized high-price segments because manufacturing costs are multiples of standard silicon modules. The decisive question is whether Freiburg lab results become production lines, in Germany or elsewhere. The pilot line for solar roof tiles represents one step; whether it scales to series production remains open.
Intersolar in Five Days: Munich as Test Case
The record module goes on public display June 23, 2026. At Intersolar in Munich, part of the world's largest solar energy trade fair platform "The Smarter E," Fraunhofer ISE exhibits the module through June 25. The trade show will reveal what industrial interest the shingle-matrix technology attracts and whether manufacturing partners emerge for scaling.
Parallel to the solar record, Fraunhofer ISE launched a research project addressing the next link in the photovoltaics chain: "GaNHypeCharge" develops a high-efficiency PV hybrid storage system with bidirectional DC charging for electric vehicles. The consortium including Viessmann Elektronik, Infineon Technologies, Sumida, and TLK-Thermo works through February 2029 on a system directly coupling solar installation, home battery, and vehicle charging via gallium nitride semiconductors that generate less heat than conventional silicon components. Funding comes from the Federal Government's 8th Energy Research Program, targeting over 97-percent system efficiency. The record and new project show where Freiburg's gaze points: toward integrating generation, storage, and mobility, not gigawatt-scale manufacturing.