Solar Cells: All-Vacuum-Deposited Stoichiometrically Balanced Inorganic Cesium Lead Halide Perovskite Solar Cells with Stabilized Efficiency Exceeding 11% (Adv. Mater. 12/2017)

In article number 1605290, Hao-Wu Lin and co-workers report efficient all-vacuum-deposited inorganic cesium lead halide perovskite solar cells of which the stoichiometric ratios of the precursors were carefully calibrated by ellipsometry. The incorporation of bromine was exploited to further enhance the device performance and stability. The results provide a paragon for the use of inorganic precursors en route to efficient vacuum-deposited perovskite devices.