A new solar power technology may be hitting the market soon. New textile-based solar cells are being developed that could change the way that solar energy is produced, making it possible to wear these solar cells. The substrate for the solar cells is a woven fabric rather than the glass or silicon conventionally used.
New textile-based solar cells developed by Fraunhofer researchers, semitrailers could soon be producing the solar electricity needed to provide solar power cooling systems or other onboard solar-powered systems equipment. In short, textile-based solar cells could soon be adding a whole new dimension to photovoltaic cells, complementing the use of conventional silicon-based solar cells.
In the future, we may well see other surfaces being exploited for photovoltaic cells generation. Truck tarps, for example, could be used to produce the solar electricity consumed by the driver when underway or parked up for the night, or to provide solar power electronic systems used to locate trailers in shipping terminals.
Similarly, conventional building facades could be covered with photovoltaic cells textiles in place of concrete render. Or the blinds used to provide shade in buildings with glass facades could be used to create hundreds of square meters of additional surface for producing solar energy.
Glass-fiber fabric as a solar-cell substrate
At the heart of such visions are pliable, textile-based solar cells developed at the Fraunhofer Institute for Ceramic Technologies and Systems IKTS, in collaboration with the Fraunhofer Institute for Electronic Nano Systems ENA and Sächsisches Textilforschungsinstitut e.V.
“There are a number of processes that enable solar cells to be incorporated in coatings applied to textiles,” explains Dr. Lars Rebenklau, group manager for system integration and electronic packaging at Fraunhofer IKTS.
In other words, the substrate for the solar cells is a woven fabric rather than the glass or silicon conventionally used. “That might sound easy, but the machines in the textile industry are designed to handle huge rolls of fabric – five or six meters wide and up to 1000 meters in length,” explains Dr. Jonas Sundqvist, group manager for thin-film technology at Fraunhofer IKTS.
“And during the coating process, the textiles have to withstand temperatures of around 200 °Celsius. Other factors play a key role too: the fabric must meet fire regulations, have a high tensile strength and be cheap to produce. “The consortium therefore opted for a glass-fiber fabric, which fulfills all of these specifications,” Rebenklau says.
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