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Lead-halide perovskite solar cells (PSCs) have attracted tremendous attention during the past few years owing to their extraordinary electronic and photonic properties. To improve the performances of PSCs, many researchers have focused on the compositional engineering, solvent engineering, and film fabrication methodologies. Interfacial engineering of PSCs has become a burgeoning field in which researchers aim to deeply understand the mechanisms of cells and thereby increase the efficiency and stability of PSCs. This review focuses on the interface tailoring of lead-halide PSCs, including the modification of each layer of the cell structure (i.e., perovskite absorber, electron-transport layers, and hole- transport layers) and the interfacial materials that can be introduced into the PSCs.
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