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Heliatek Transparent Solar Cell Sets New Energy Efficiency Record
Heliatek GmbH, the global leader in organic solar film manufacturing, has achieved a groundbreaking milestone in transparent solar cell technology. Their latest innovation features a 40% light transmittance combined with an energy efficiency rate exceeding 7%, setting a new world record. This advancement follows their previous achievement of 12% efficiency for opaque organic solar cells, demonstrating continuous progress in the field.
This development aligns with Heliatek’s strategic vision to offer glass manufacturers the HeliaFilm™ solution for building-integrated photovoltaics (BIPV) and roofing applications. According to CEO Thibaud Le Seguillon, "The transparency of our products is central to our business approach. HeliaFilm™ can be customized to meet the specific needs of our partners. As a component supplier, we provide a thin film that simultaneously allows light transmission and electricity generation—this unique combination significantly broadens our market opportunities."
In both architectural and automotive applications, colored glass helps reduce glare, but thin films like HeliaFilm™ offer an additional benefit: power generation. By applying HeliaFilm™ on glass roofs, automakers can earn eco-innovation credits while contributing to CO₂ reduction goals. The embedded solar panels in windows and façades not only enhance aesthetics but also generate clean energy from sunlight.
The latest version of HeliaFilmâ„¢ achieves an impressive 7.2% energy efficiency at 40% transmittance under standard test conditions. This performance represents a major leap forward in transparent solar technology. While opaque versions currently reach 12% efficiency, the transparent variant still delivers comparable results due to reduced light absorption. Depending on the application, the balance between light transmission and energy output can be fine-tuned.
HeliaFilmâ„¢ is produced using small molecules known as oligomers, which are applied through a low-temperature roll-to-roll vacuum process. This method enables selective absorption of the solar spectrum, allowing for a range of colors and transmittances. The integration of transparent conductive layers on both sides of the solar cell ensures optimal performance and flexibility for various uses.