Heliatek GmbH, a pioneer in organic solar film technology, has achieved a breakthrough in the performance of transparent solar cells. The latest development features a solar cell with 40% light transmittance and an energy efficiency rate exceeding 7%, setting a new global benchmark. This follows the company’s previous record of 12% efficiency for opaque organic solar cells.
This advancement aligns with Heliatek’s strategic vision to provide glass manufacturers with transparent HeliaFilmâ„¢ technology for building-integrated photovoltaics (BIPV) and roofing applications. According to CEO Thibaud Le Seguillon, “Transparency is central to our business model. HeliaFilmâ„¢ can be customized to meet the specific needs of our partners. As a component supplier, we offer a thin film that combines light transmission with electricity generation—this unique feature significantly expands our market opportunities.â€
In both architectural and automotive applications, colored glass helps reduce glare, but thin films like HeliaFilmâ„¢ offer an additional benefit: power generation. Integrating HeliaFilmâ„¢ into glass roofs not only generates clean energy but also helps automakers earn eco-innovation credits and meet COâ‚‚ reduction goals. Similarly, building facades and windows embedded with HeliaFilmâ„¢ allow natural light to enter while simultaneously producing electricity.
The latest generation of organic solar cells has achieved a 7.2% energy efficiency at 40% transmittance, measured under standard test conditions on a white background. Heliatek has successfully optimized its transparent HeliaFilmâ„¢ for maximum energy conversion. While their opaque solar cells currently reach 12% efficiency, the transparent version achieves comparable output by utilizing 60% of incoming light for energy harvesting. The balance between transparency and power generation can be fine-tuned based on application requirements.
This is made possible through the use of a transparent conductive layer on both sides of the solar cell, enabling the production of HeliaFilmâ„¢. The technology relies on small molecules, or oligomers, which are deposited at low temperatures using a roll-to-roll vacuum process. This allows for selective absorption of the solar spectrum, enabling the creation of different colors and levels of light transmission.
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