Aiko showcases 690 W back-contact solar module with 25.6% efficiency

Chinese PV module maker Aiko has introduced its fourth-generation G4 Infinite Ultra module at SNEC 2026 in Shanghai, extending its all-back-contact (ABC) module platform into the 690 W power class.

The company said the new product, also marketed internationally as the Infinite Ultra Series, builds on its previous Infinite ABC module design. Aiko reported a peak module efficiency of 26% and a mass-production output of up to 690 W at 25.6% efficiency.

The module is based on Aiko’s n-type ABC cell technology, which places all electrical contacts on the rear side, leaving the front surface free of metal gridlines. The architecture is intended to increase light absorption and improve aesthetics, particularly for rooftop and distributed PV applications.

According to the company, the G4 platform retains key module features from earlier generations, including hidden busbars, zero cell spacing and zero-busbar (0BB) technology. Power output has been increased within the same standard module footprint through improvements at both cell and module level, the manufacturer said.

On the cell side, Aiko has optimized the poly layer, interface passivation, front-side texture, hydrogen passivation, PN-region structure and gap-region design. These changes have increased average mass-production ABC cell efficiency from 27.2% to 27.4%, according to the company.

On the module side, Aiko has introduced nanoscale insulating coatings and process upgrades that reduce edge creepage distance by 32%, while maintaining reliability. The company says the design reduces non-active area by 20% and increases active-area ratio to 97%. Combined cell and module improvements add around 10 W in power output compared with the previous Infinite generation.

The standard-format G4 Infinite Ultra module measures 2,382 mm × 1,134 mm. Aiko expects variants for different applications to enter mass production and delivery in the third quarter of 2026.

At the event, Aiko also showcased an ABC fire-resistant module for higher-safety applications. The product incorporates a thermal-shielding fire-resistant barrier material and a protection system covering temperature control, arc prevention, flame retardance, fire isolation and thermal insulation.

The company reported 3.75 GW of G4 module orders during the first two days of SNEC 2026, including 650 MW in China and 3.1 GW from overseas markets.