Vapor-assisted deposition of highly efficient, stable black-phase FAPbI3 perovskite solar cells

Moving a perovskite into the blackThe bandgap of the black α-phase FAPbI3 (where FA is formamidinium) is nearly ideal for solar cells, but it is unstable with respect to the photoinactive yellow δ-phase. Lu et al. found that a film of the yellow phase was converted to a highly crystalline black phas...

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