Oxford PV and Sunmaxx Achieve 26.6% World Record Efficiency for Large Perovskite-Silicon Tandem Solar Module

September 6, 2026

Solar Power Portal UK, Germany

Overview

Oxford PV, in collaboration with Germany’s Sunmaxx, has achieved a world record power conversion efficiency of 26.6% for a large-area 60-cell, double-glass perovskite-silicon tandem module exceeding 1.6 square meters. This efficiency, independently certified by Fraunhofer ISE’s PV calibration laboratory, positions the module as ideal for residential applications. Oxford PV is actively pursuing the commercialization of this high-efficiency technology, indicating imminent market entry for perovskite solar cells that promise higher power output from smaller footprints and optimized installation costs.

In Depth

Key Findings

Oxford PV, a leading perovskite technology company based in the UK, in collaboration with German partner Sunmaxx, has announced a new world record for the power conversion efficiency of a large-area perovskite-silicon tandem solar module. The module, a 60-cell double-glass unit exceeding 1.6 square meters, achieved an impressive 26.6% efficiency, a feat independently certified by Fraunhofer ISE’s PV calibration laboratory in Germany.

Technical Details

Record Efficiency: The 26.6% efficiency is a significant benchmark, particularly because it was achieved on a large-area module suitable for practical applications, rather than small-scale laboratory cells.
Module Specifications: The module consists of 60 cells in a double-glass configuration, covering an area greater than 1.6 square meters. This size is deemed ideal for residential installations, indicating direct relevance to mass market deployment.
Certification: Validation by the Fraunhofer ISE PV calibration laboratory, a highly respected and independent institution, lends strong credibility to the reported efficiency figure.
Perovskite-Silicon Tandem Technology: The core of this achievement is Oxford PV’s advanced perovskite-silicon tandem technology. This architecture layers a perovskite solar cell atop a conventional silicon cell, enabling the capture of a broader spectrum of sunlight and thereby exceeding the theoretical efficiency limits of single-junction solar cells.

Background & Context

The global solar energy sector is witnessing increasing demand for high-efficiency technologies that can generate more power from limited installation areas. Perovskite solar cells are at the forefront of this innovation, promising high theoretical efficiencies and potentially lower manufacturing costs compared to traditional silicon cells. Tandem cells, which combine perovskites with silicon, are particularly promising for breaking current efficiency ceilings, driving intense competition among research institutions and companies worldwide. Oxford PV has been a pioneer and leader in this field for many years.

Strategic Significance & Outlook

With this world record, Oxford PV aims to accelerate the transition of its high-efficiency technology towards commercial utilization. The market introduction of these modules could substantially increase the power output of residential solar systems, enabling greater clean energy generation even in space-constrained environments. Furthermore, this development is expected to contribute to a reduction in the levelized cost of electricity (LCOE) from solar power, serving as a crucial milestone in promoting the broader adoption of renewable energy globally.

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