Perovskite is also common in "the planet": 93% of the mantle is silicate perovskite, according to Wikipedia. I'm not sure the geological abundance (accessible o

Perovskite is also common in "the planet": 93% of the mantle is silicate perovskite, according to Wikipedia. I'm not sure the geological abundance (accessible or not) is the determining factor in the cost of solar cells made with these materials. Edit: actually, it seems from the more detailed descriptions that the perovskites useful in solar cells have a totally different chemical formula from the common geological ones, so your point about abundance of silicon needs to be measured against whatever elements these (presumably synthetic) perovskites contain.