Key Findings
LONGi, a leader in the solar photovoltaic industry, officially announced in its H1 2026 earnings report that its 2-terminal perovskite-silicon tandem solar cell has been certified by the European Solar Test Installation (ESTI) with a world-record power conversion efficiency of 35.5%. This phenomenal efficiency pushes the boundaries of next-generation solar cell technology and unlocks new possibilities for solar power generation. The achievement unequivocally demonstrates LONGi’s robust research and development capabilities and its commitment to high-efficiency technologies.
Technical & Clinical Details
The 35.5% conversion efficiency was specifically achieved with a 2-terminal perovskite-silicon tandem cell structure. In this configuration, a perovskite layer is placed on top of a silicon layer, allowing each layer to absorb different wavelengths of sunlight, thus utilizing a broader spectrum more efficiently than conventional single-junction cells. The key to this high efficiency lies in effective defect passivation techniques at the buried interfaces. This significantly suppresses non-radiative recombination of charge carriers within the perovskite layer, enhancing quasi-Fermi level splitting. As a result, the device achieved a remarkably high open-circuit voltage (Voc) of 2V, contributing substantially to the overall power conversion efficiency. This technology not only improves the fundamental performance of solar cells but also holds implications for future reductions in energy costs.
Background & Context
In the solar power market, improving power conversion efficiency has always been one of the most critical challenges. Conventional silicon solar cells are now a mature technology, and their efficiency is approaching physical limits. Against this backdrop, perovskite-silicon tandem solar cells have garnered significant attention as next-generation high-efficiency solar cells, combining the stability of silicon with the tunable bandgap and high efficiency of perovskites. While research institutions and companies worldwide are intensely competing to improve tandem cell efficiency, LONGi’s establishment of a new record of 35.5%, surpassing NREL’s certified 34.85%, solidifies its position as a technological leader in this field. This holds the potential to further expand the role of solar power in global energy supply.
Strategic Significance & Outlook
LONGi’s achievement of 35.5% conversion efficiency marks a significant milestone towards the commercialization of perovskite-silicon tandem solar cells. The future outlook will focus on scaling up these laboratory-level achievements to larger-area mass-produced modules and establishing cost-effective manufacturing processes. If high efficiency and stability can be achieved simultaneously, tandem solar cells will be adopted in a wide range of applications, from residential use to large-scale solar power plants and building-integrated photovoltaics (BIPV). This will significantly increase power generation per unit area, accelerating the adoption of solar power even in regions with land-use constraints. LONGi’s breakthrough represents a crucial step towards achieving global decarbonization goals and realizing a sustainable energy future.
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