Longi Achieves World Record 28.29% Efficiency for Solar Cells

Historically, the development of solar cell technology has been an evolving process, with researchers continuously seeking to improve efficiency. Longi's latest achievement demonstrates significant progress in this field, particularly regarding crystalline silicon solar cells. The company's hybrid interdigitated-back-contact (HIBC) solar cell architecture combines several innovative features, including passivated tunneling contacts and dielectric passivation layers. This technology is crucial as it approaches its theoretical efficiency limit, now reported at 96.2% of that limit. The advancements made in HIBC solar cell technology reflect years of research and development aimed at maximizing energy conversion efficiency.

Longi's achievement is the result of extensive collaboration among researchers and engineers focused on enhancing solar energy technology. The company detailed its HIBC solar cell architecture in a scientific paper published in November 2025. The construction of the cell involves a high-resistivity, half-cut M10 wafer that features edge passivation and optimized n-type contacts. By employing a combination of high- and low-temperature processes, Longi has produced improved solar cells that yield higher energy outputs. Additionally, implementing indium tin oxide (ITO) layers and multilayer aluminum oxide (AlOx) coatings has been instrumental in reducing surface recombination, further enhancing efficiency.

The broader implications of Longi's record-setting achievement extend beyond just efficiency. Advancements in solar cell technology contribute to a more sustainable energy future by enabling the production of cleaner, renewable energy. As the world increasingly turns to solar power as a viable alternative to fossil fuels, improvements in solar cell efficiency can lead to greater adoption and integration of solar technologies in energy systems. The reduction of resistive losses and enhancements in contact resistivity also suggest potential cost savings in solar energy production, making it more accessible to a wider audience.

Looking ahead, Longi's success in achieving a 28.29% efficiency opens up new avenues for future research and development in solar technology. The company has indicated that its technology could be scaled for heterojunction solar cell manufacturing, although further improvements are necessary to minimize resistive losses in the p-type contact. This focus on continuous improvement is essential for meeting the growing global demand for renewable energy. As the solar industry evolves, Longi's achievements could play a significant role in shaping the future of solar energy and its contribution to climate change mitigation efforts.