So a panel that looks like Vanta Black, but also at non-optical wavelengths? Better efficiency is being pursued but the engineering behind real products will al

So a panel that looks like Vanta Black, but also at non-optical wavelengths? Better efficiency is being pursued but the engineering behind real products will always be the result of balancing design constraints: https://en.m.wikipedia.org/wiki/Solar-cell_efficiency https://en.m.wikipedia.org/wiki/Solar-cell_efficiency