Perovskite material with superlattice structure might surpass efficiency of a 'perfect' solar cell

https://techxplore.com/news/2022-08-perovskite-material-superlattice-surpass-efficiency.html

"superlattice consists of a nanoengineered phase separation between Bi3+ alloyed and intact Sn-I regions in vertically aligned multiple-quantum-wells. This composition creates component variations in the atomic scale, which in turn enables hot carriers to quickly cross the multiple-quantum-wells heterostructural interface before they relax–a feat that is usually impossible to achieve... short diffusion length required to cross the heterostructural interface"

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