Surat-based solar module manufacturer Navitas Solar has entered into a five-year partnership with California-based perovskite technology company Caelux Corporation to develop and manufacture 5 GW of hybrid tandem solar modules in India.

Under the agreement, Navitas Solar will integrate Caelux’s perovskite-based energy-generating glass with its N-type tunnel-oxide passivated contact technology. According to both companies, the resulting modules are expected to achieve efficiencies of up to 28% or higher, compared with current module efficiencies of around 25%.

The proposed modules will combine a perovskite layer with a silicon-based TOPCon layer in a single product. This design aims to increase electricity generation from the same installation area compared with conventional silicon-only modules.

Navitas Solar and Caelux are targeting commercial production by 2028.

The partnership aims to combine Navitas Solar’s manufacturing capabilities with Caelux’s perovskite technology to support large-scale hybrid tandem module production in India. It also aims to strengthen domestic manufacturing and integrate advanced solar technology with local supply chains.

Navitas Solar manufactures mono-passivated emitter and rear-contact (PERC) and N-type TOPCon solar modules with power ratings up to 720 W. The company also manufactures solar encapsulants and provides engineering, procurement, and construction services.

The company currently has an annual solar module manufacturing capacity of 3 GW. It manufactures Mono PERC and TOPCon modules with power ratings ranging from 40 W to 720 W. It also manufactures solar encapsulants through its subsidiary Navitas Alpha Renewables and provides engineering, procurement, and construction services through Navitas Planet.

Caelux develops perovskite technology that converts the top glass of a solar module into an additional power-generating layer. The company claims its technology can increase module energy density by up to 30% and reduce the levelized cost of electricity by at least 20%.

This June, Navitas Solar said it would invest approximately ₹15 billion (~$170 million) to establish a 3.6 GW solar cell manufacturing facility and a pilot wafer-ingot production line in Gujarat.

India added just over 9 GW of solar cell manufacturing capacity in 2025, compared with nearly 119 GW of module manufacturing capacity.