![]() ![]() A broad range of experimental characterizations exhibit that the introduction of 2D perovskite improve the energy level alignment with adjacent carbon electrode and enhance the hydrophobic property of the perovskite sample. The relevant growth process, light absorption ability, energy level regulation and stability property of the samples are systematically investigated. Herein, a 2D perovskite with a spacer cation of 1, 4-dimethylphenylene ammonium is grown on 3D perovskite film by the solid-state heat-pressure method. However, it is difficult to fabricate 2D/3D perovskite heterojunction with accurate composition and structure through only solution process, and the location of 2D perovskite is also difficult to regulated owing to the uncontrolled cation exchange between organic constituents, which results in mismatched energy level arrangements. Formation of a two-dimensional (2D) perovskite layer on the top of three-dimensional (3D) perovskite has been demonstrated to be effective in reducing interfacial charge recombination and improving the performance and stability of perovskite solar cells (PSCs). ![]()
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