Heliatek GmbH, the world's leading organic solar film production company, set a new record for energy efficiency of transparent solar cells: solar cells have 40% transmittance and energy efficiency exceeds 7%. The company had previously set a world record of 12% energy efficiency for opaque (non-transparent) organic solar cells.

The progress of this experiment is in line with the company's strategy to provide glass manufacturers with transparent HeliaFilm TM for building integration (BIPV) and roof. Heliatek CEO Thibaud Le Seguillon said: "The transparency of our products is at the heart of our market policy. The HeliaFilm TM can be tailored to meet the needs of our partners. We are a parts supplier and this part is a A thin film that combines light transmission with power generation. This unique combination expands our market potential."

The use of colored glass in these two application areas reduces glare, which can also be achieved by thin films, so the power generation film has become another choice for manufacturers. Using HeliaFilm TM on a glass roof will not only generate energy, but it will also help automakers get eco-innovation points and achieve CO2 reduction targets. The architectural glass panels and windows embedded in the HeliaFilmTM allow the outside of the building to be dispersed and generate electricity.

The latest generation of organic solar cells set a 7.2% energy efficiency record with 40% transmittance. The measurement is based on standard test conditions under a white background. Heliatek successfully created the best energy conversion for the transparent HeliaFilm TM. At present, its opaque battery achieves 12% of power generation efficiency. Because part of the transparency makes only 60% of the light used for energy harvesting, 7.2% of the batteries have the same energy efficiency. Depending on the application, the balance between the light allowed to pass and the power generated can be adjusted. By introducing a transparent conductive layer on the front and back of the solar cell, production of the transparent HeliaFilmTM is achieved.

HeliaFilmTM production is based on small molecules (oligomers). The oligomers can be deposited at a low temperature in a roll-to-roll vacuum process. The selective absorption of the solar spectrum can convert sunlight into electricity for different colors and transmittances.

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