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Power Electronics INSIDER
German researchers have developed a technique for applying realistic designs to photovoltaic (PV) modules, which convert sunlight into electricity, enabling them to mimic roof tiles and integrate more seamlessly into buildings. This new method, termed ShadeCut, was developed by a research team at Freiburg’s Fraunhofer Institute for Solar Energy Systems (ISE), one of the world’s largest solar energy research institutes.
This technique allows complex visual patterns to be displayed on the panels while retaining approximately 95% of the power output of an uncoated module. The institute builds on the MorphoColor technology, a bio-inspired coating for solar panels that mimics natural structures to produce vibrant colors without significantly reducing efficiency.
Color is produced through microscopic structures, which are tiny surface patterns that bend and reflect light, rather than through traditional pigments. The method uses specially colored films with transparent cutouts to create designs that can resemble roof tiles, masonry, or custom graphics.
The MorphoColor method draws inspiration from the iridescent wings of the Morpho butterfly. It employs three-dimensional (3D) photonic structures, which are tiny materials that control the movement of light, to manipulate light. This process generates vivid, angle-stable colors while minimizing energy loss. Following this biological model, institute scientists also applied a similar surface structure to the reverse side of photovoltaic module covers using a vacuum process.
Martin Heinrich, PhD, a researcher and group leader at Fraunhofer ISE, stated that the technology is particularly relevant for modules integrated into facades, roof-integrated PV, or railings, especially on historic buildings. Heinrich stated that ShadeCut employs laser or CAD-controlled processes to cut patterns into films coated with MorphoColor. He explained that ShadeCut modules can replicate the appearance of masonry or roof tiles and closely match surrounding colors, and that PV systems can be customized with logo lettering or patterns.
According to the team, MorphoColor technology has surpassed its biological inspiration. Furthermore, independent tests have demonstrated that these coatings retain approximately 95% of the power output of uncoated panels, making the technology superior to comparable solutions on the market.
The technology is particularly attractive for applications in which aesthetic considerations limit solar panel adoption, as the films can be applied to standard photovoltaic and solar thermal modules and produced in a variety of colors.
Such adaptability could help expand the role of building-integrated photovoltaics, in which solar panels are incorporated into a building’s structure. They can serve as part of the roof, façade, or windows, rather than simply mounted on top. Historic areas or design-focused projects often resist the use of traditional black or blue panels, but color-matched or patterned modules can harmonize with the existing aesthetic and increase desirability.
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