Has the potential for an upside previously unavailable at low cost. By stacking layers of different solar cells you can surpass the theoretical limit of a single layer which is 32% (or around 28% in practical terms including spaces that aren't solar cell).
Single layer silicon is in the 22-25% range now with the 22% modules being the optimal cost in most areas.
The modules also only make up a small fraction of the cost of a PV install (around 25-30%), so increasing efficiency from 22% to 32% reduces BOS costs by almost as much as the entire module currently costs
Perovskites are also dirt cheap, so are a good candidate for increasing efficiencies. The difficulty is in making them last. Accelerated aging tests are promising but they haven't hit market yet.
BOS: balance of system, i. e., everything else besides the panels (mountings, wiring and connectors, labor and land costs being the main parts of BOS affected by panel efficiency.)
Single layer silicon is in the 22-25% range now with the 22% modules being the optimal cost in most areas.
The modules also only make up a small fraction of the cost of a PV install (around 25-30%), so increasing efficiency from 22% to 32% reduces BOS costs by almost as much as the entire module currently costs
Perovskites are also dirt cheap, so are a good candidate for increasing efficiencies. The difficulty is in making them last. Accelerated aging tests are promising but they haven't hit market yet.