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DOI: 10.1002/aenm. 201601062 the perovskite materials, for example, very long charge carrier diffusion length,[6, 7] high panchromatic light absorption with a tunable band gap,[8, 9] and high charge carrier mobility.[10] These unique properties have made the organic–inorganic hybrid perovskite materials very attractive in various research fields,[11] eg, light-emitting devices,[12] lasers,[13] photodetectors.[14] The great improvement in the PCE of PSCs mainly relies on the precise optimization of the perovskite composition,[15] the constant improvement of the perovskite fabrication techniques,[16] and the novel design of efficient selective charge collecting materials.[17] Specifically, the interface charge-selective materials, including electron-transport material and hole-transport material (HTM), are key components for obtaining PSCs with both high conversion efficiency and high stability.[18] In this respect, a great …