> For the case of perovskite cells, adding layers does not seem to multiply the production cost. I guess this makes sense given the hard bit is the substrate.

> For the case of perovskite cells, adding layers does not seem to multiply the production cost. I guess this makes sense given the hard bit is the substrate. This would be good for everyone as second hand silicon cells for 10-30c/W will open up a bunch of new uses.