GREW Solar and Caelux Formed Tandem Module Partnership
The companies have launched a five-year deal to integrate perovskite thin-film technology into solar module glass.
Updated on Sept. 21, 2026 in Energy
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GREW Solar and Caelux Corporation have signed a five-year partnership to produce hybrid-tandem solar modules. The collaboration uses Caelux active glass, which captures light that silicon cells often miss to increase overall power density.
Why it matters
This technology allows manufacturers to boost performance without replacing their existing silicon module factories. By increasing module efficiency, companies can generate significantly more energy from the same physical footprint.
Caelux active glass is designed for compatibility with common module technologies like TOPCon and heterojunction, enabling output increases on 10 GW lines to 12 GW. Targeted efficiency gains reach up to 29 per cent for GREW Solar.
The players
Caelux Corporation
Headquartered in the United States, this firm specializes in perovskite thin-film coatings for solar glass applications.
GREW Solar
This solar energy firm has entered a five-year commercialization agreement to integrate advanced thin-film tech into its modules.
Rayzon Solar
An Indian manufacturer that has signed a production agreement to utilize Caelux glass technology.
Navitas Solar
This Indian manufacturer is participating in the 5 GW production agreement to create hybrid-tandem solar modules.
The details
The process involves depositing a perovskite solar layer onto the front cover glass of standard modules, which is compatible with units ranging from 1.7 to 2.5 meters. In addition to the GREW Solar deal, Caelux has secured 5 GW of production agreements with Indian manufacturers Rayzon Solar and Navitas Solar.
Timeline
Caelux shipped its first commercial order of active glass technology in 2025.
Commercial production of the hybrid-tandem modules is slated to begin in India in 2028.
The Big Picture
This move signals a major shift toward perovskite thin-film solar cells as the industry attempts to surpass the efficiency limits of traditional silicon. By scaling this technology, the industry moves away from pure silicon dependence toward multi-junction hybrid designs.
The adoption of hybrid-tandem modules could lead to cheaper energy sources by extracting more power from the same amount of sunlight. Higher efficiency modules mean that commercial and residential solar installations require less roof space to generate the same electricity output.
The takeaway
Commercializing perovskite-silicon tandem modules allows the solar industry to leverage existing infrastructure while achieving significant performance gains. Consumers should look for these higher-efficiency products in the coming years as manufacturing scales globally.
Further reading
For more on emerging hardware, see the Energy section.
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