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Inverted MAPbI3 Perovskite Solar Cells with Graphdiyne Derivative-Incorporated Electron Transport Layers Exceeding 20% Efficiency In article number 1900241, Tonggang Jiu and co-workers introduce chlorine-substituted graphdiyne into MAPbI SB 3 sb -based perovskite solar cells to produce a peak efficiency of 20.34% with suppressed J-V hysteresis, which results from the interaction of derivated graphdiyne and PCBM, to be exact, four types of non-covalent bonds. These findings suggest that derivated graphdiyne could have potential applications in solar cells and other photoelectric devices. [Extracted from the article]