Ooooh! That's a great idea! I don't think I have something for high tier Solars... Thanks for the linkNot sure if this has been mentioned or not, but I do have an idea regarding high-tier solars: make them require metamaterials like the ones we've been able to develop in the real world. Could call it something like a "Photon Distortion Plate." The way the experimental ones work is that they create something very similar to a black hole effect, forcing incoming light to bend into an area from which it can't escape, allowing the solar generator to operate much more efficiently and, consequently, producing more power.
As for what they'd require...not exactly sure, on that front. But, perhaps looking over this will give ya some ideas.
There's a good chance I will be using that idea