transparentThanks to a new development made ​​by the German company Heliatek on organic solar films, it is now possible to obtain levels of transparency up to 40%, with an efficiency exceeding 7%.

Note that the company holds the world record efficiency of 12% for (non-transparent) organic solar cells opaque.

Heliatek offers manufacturers of glass transparent solution for car roofs and building integrated photovoltaics (BIPV). “The transparency of our products is at the heart of our approach to the market. HeliaFilm Our solution is tailored to meet the specific needs of our partners,” said Thibaud Le Séguillon CEO Heliatek. “Our company provides components, namely a film able to combine two elements: transparency and energy This unique combination helps to increase our market potential.”.

In these two areas of application, they use tinted to reduce glare, which is feasible by applying a film. Thus, replacing a movie by another equally capable of generating electricity is an interesting change for manufacturers. HeliaFilm use for the glass roof cars will produce energy. In addition, automakers can get credits Eco-innovation in order to achieve their goals for CO2 emissions. Windows and architectural glass panels incorporating this solution could also be used to produce electricity discreetly from the outer shell of a building.

The latest organic solar cells with a 40% light transmission broke a record efficiency up to 7.2%. This figure was obtained in the trials conducted under standard conditions using a white background. The company is well managed Heliatek to generate optimal energy conversion for its transparent HeliaFilm solution. Currently, its opaque cells reach an efficiency of 12%.

Cells in 7.2% offer the same efficacy because of partial transparency that allows to use only 60% of the light within the energy capture. Depending on the application, it is possible to adjust the balance between the light that passes and electricity is generated. The production of the transparent HeliaFilm solution is possible thanks to the introduction of the transparent conductive layers in front and back of the solar cells. It is based on small molecules (oligomers). The deposition of the oligomers is carried out at low temperature in a process of vacuum evaporation roll (“roll-to-roll”). The selective absorption of the solar spectrum can target different colors and transparency to convert sunlight into electricity.

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