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Despite the excellent photovoltaic properties achieved by perovskite solar cells at the laboratory scale, hybrid perovskites decompose in the presence of air, especially at high temperatures and in humid environments. Consequently, high‐efficiency perovskites are usually prepared in dry/inert environments, which are expensive and less convenient for scale‐up purposes. Here, a new approach based on...
Functionalized imidazolium iodide salts (ionic liquids) modified with CH2CHCH2, CH2CCH, or CH2CN groups are applied as dopants in the synthesis of CH3NH3PbI3‐type perovskites together with a fumigation step. Notably, a solar cell device prepared from the perovskite film doped with the salt containing the CH2CHCH2 side‐chain has a power conversion efficiency of 19.21%, which is the highest...
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