Comment by realo

16 hours ago

Perovskite Tandem are the best , according to the graph.

Why is it that those are reserved for ultra-big utility companies and I cannot buy those for my home or even my balcony?

At present, those tandem cells are still experimental. Nobody is manufacturing them on gigawatt scale like for other solar cell technologies.

  • Well... if you go to the web site , they seem to welcome very large orders. Just not mine or yours.

    Might be experimental and unavailable, but just for small orders? Come on ...

They're much more expensive than traditional silicon cells, they often use toxic materials (lead, cadmium, etc), and IIRC their lifespans aren't as long. Unless you have significant space constraints it's usually better just to get twice as many traditional panels.