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Solar modules now selling for less than €0.06/W in Europe
(www.pv-magazine.com)
This is a most excellent place for technology news and articles.
I don't know that processing silicon is a polluting activity. There is heat involved, and some Chinese producers are 100% solar powered for their processing. Though I'm sure bulldozers or shipps/trucks are involved in obtaining sand.
I'm not a fan of any appeals to gatekeep energy use to "just essentials" instead permitting growth that people want, and cleaning up the energy use involved.
There's a huge gulf between essential and wasteful.