Longi sets new world record with 35.5%-efficient perovskite-silicon tandem cell - pv magazine Global

The result was certified by the European Solar Test Installation (ESTI).

Longi has announced a power conversion efficiency of 35.5% for a two-terminal crystalline silicon-perovskite tandem solar cell, setting a new world record for the technology.

The Chinese PV manufacturer presented the result on July 14 during its 2026 Solar and Storage Innovation Technology Conference at Shanghai Jiao Tong University. The result was independently certified by the European Solar Test Installation (ESTI), part of the European Commission’s Joint Research Centre in Italy.

Longi did not disclose the active area or detailed electrical characteristics of the record cell. The reported figure therefore refers to a certified laboratory device rather than a commercial module or mass-production product.

The new result improves on Longi’s previous directly comparable laboratory record of 34.85%, announced in April 2025 and certified by the US National Renewable Energy Laboratory (NREL). The company previously reported certified tandem efficiencies of 31.8% in 2023, 33.9% later that year and 34.6% in 2024.