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Gonna chime in here, have a weak materials engineering background.

The material economics go wild if you try to solve for stability of perovskite. You really don't know how much this thing is going to cost.

With perovskite, from what I remember, you get the nice efficiencies with lead based perovskites.

This increases the price of electricity as you layer it on top and you get an extra 2% efficiency.

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