Caelux Partnered to Scale Hybrid-Tandem Solar Production
New five-year deals aim to boost module efficiency to 29% by integrating perovskite layers into standard silicon glass.
Updated on Sept. 21, 2026 in Energy
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Caelux Corporation has entered a five-year partnership with GREW Solar and secured production agreements with Indian manufacturers to scale its perovskite-based energy-producing glass. The company has moved from announced technology to commercial reality, having shipped its first commercial orders in 2025.
Why it matters
The technology allows manufacturers to upgrade existing silicon module factories to boost power density without replacing core infrastructure. By capturing spectrum that traditional silicon cells waste, the approach aims to increase module efficiency beyond current 23% industry standards.
Caelux's tech elevates production from 10 GW to 12 GW on existing TOPCon lines while targeting module efficiencies of 28% to 29%. This performance exceeds the 23% efficiency typical of current market standard modules.
The players
Caelux Corporation
A U.S.-based developer of perovskite thin-film technology designed to retrofit existing silicon solar manufacturing lines.
GREW Solar
A solar module manufacturer that has signed a five-year commercialization partnership to implement Caelux technology.
Rayzon Solar
An Indian solar manufacturer committed to large-scale production of Caelux-enhanced modules.
Navitas Solar
An Indian solar manufacturer targeting 28% efficiency with the implementation of hybrid-tandem module technology.
The details
Caelux deposits a thin film of perovskite—a crystal structure capable of capturing high-energy light—directly onto the front cover glass of standard solar modules. This layer acts as a secondary harvester, capturing photons that standard silicon cells cannot convert efficiently. Because the glass is compatible with mono-PERC, TOPCon, and heterojunction architectures, factories can integrate this layer without replacing their existing silicon manufacturing equipment.
Timeline
2025: Caelux shipped the first commercial order of its active glass technology.
2028: Commercial production of hybrid-tandem modules is targeted to begin in India.
The Tech Race
The transition to tandem cells represents a critical shift from standard silicon PERC and TOPCon modules toward higher-density energy capture. This development follows the industry trend of boosting panel efficiency to lower the levelized cost of energy without requiring new, dedicated manufacturing facilities.
Residential and commercial users can expect the first hybrid-tandem modules incorporating this technology to enter commercial production by 2028. These modules are designed to replace existing solar hardware, offering higher power density within the same physical footprint.
The takeaway
The move toward 29% module efficiency suggests that hybrid-tandem designs are rapidly moving from the lab to mass-market production pipelines. Watch for the 2028 ramp-up of Indian manufacturing facilities to confirm if these efficiency targets translate to stable commercial output.
Further reading
For broader context on current manufacturing shifts, visit the Energy section.
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