TOS had them too. Also, 2001 A Space Odyssey also had something even more like a modern tablet. .
Correction. It actually has been done.. A prototype has successfully demonstrated proof of concept.
A space solar power prototype that was launched into orbit in January is operational and has demonstrated its ability to wirelessly transmit power in space and to beam detectable power to Earth for the first time.
You are right about the efficiency, but since the amount of energy that can be gathered in orbit is so large, the small fraction that can be received on Earth could still be significant.
Hick-hop