NREL Puts Sound Waves To Test In Making Solar Cells Cheaper
Existing technology uses a sacrificial etch layer, which allows a cell to be lifted off a gallium arsenide substrate so that the substrate can be used again, but the process takes hours and leaves behind a residue that requires a polishing step. Polishing is relatively expensive and limits the potential cost savings of this substrate reuse method. In contrast, spalling takes seconds, creating a controlled fracture within the substrate nearly parallel to its surface.
“The surface is less corrugated,” Schulte said, “so when you grow a new device on it, it’s possible to achieve a high efficiency with relatively minimal, or potentially no, surface repreparation.”
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