Fraunhofer ISE Doubles Production Speed Of Silicon Wafers For Solar Panels

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Silicon wafers are the key component of solar panels. Fraunhofer ISE is finding ways of making them faster and cheaper.

Solar and wind are the keys to the world’s need for more renewable energy. But there are production constraints that limit how quickly things like wind turbine blades and solar panels can be manufactured. The primary components of solar panels are the silicon wafers that turn sunlight into electricity. That’s not to say there aren’t other components that are also important to making solar panels, but without silicon wafers they are more decorative than functional.

One of the new developments involves the implement of on-the-fly laser equipment which continually processes the wafers as they move at high speed under the laser scanner. For the metalization of solar cells, the consortium introduced rotary screen printing instead of the flatbed screen printing process that is standard procedure today.

Following the electrode imprint on the solar cells, the contact of the electrodes to the silicon solar cell is formed on both sides in inline furnaces. Standard furnaces would have required a significantly larger heating chamber to increase throughput at this stage. Instead, the project consortium installed a three times faster belt speed in the furnace and compared the quality of the sintered solar cells with today’s standard.

 

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