[akgerber]

I think there's a lot more surplus sunshine than surplus Ga or In.

[camccann]

Depends on where you are. Sunshine is a little harder to box up and ship to where it's needed.

[MikeCapone]

Indeed. That's why they put the best solar panels on space probes and satellites, and why they use those with the best performance/price ratio for solar farms in the desert.