He might be referring to gallium arsenide. https://en.wikipedia.org/wiki/Gallium_arsenide#Solar_cells_and_detectors https://en.wikipedia.org/wiki/Gallium_arsen

He might be referring to gallium arsenide. https://en.wikipedia.org/wiki/Gallium_arsenide#Solar_cells_and_detectors https://en.wikipedia.org/wiki/Gallium_arsenide#Solar_cells_a...