-(3-aminopropyl)-imidazole diiodide (APDI) was introduced on the upper surface of the perovskite for the first time to modulate the terminal groups. The defect traps were suppressed by binding N cations from the APDI with Pb. Consequently, the optimum APDI-treated device achieved a PCE of 21.41% and exhibited excellent stability.

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http://dx.doi.org/10.1039/d3cc01379kDOI Listing

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