Comment by mchannon

a-Si has been at or beyond this level of efficiency since the 90's and also does not require a Cz or FZ process.

It's encouraging to see progress but where perovskite thin films show potential is in an integrated mechanical stack application with silicon, where they can supplement each other's barely-double-digit efficiencies focusing on different parts of the spectrum to combine to reach something on par with traditional crystalline silicon, but thinner and with lower production costs.

Seeing thin film beat crystalline silicon is like seeing nuclear fusion become cost-effective. It's perpetually 10 years away, and has been since the 70's.