Abstract
HighlightsThree bulky cation chlorides (PMACl, PEACl and NMACl) are used to modify the perovskite surface and form pure-anion 2D (PMA)2PbCl4, mixed-anion 2D (PEA)2Pb(IxCl4-x), and non-2D NMAI passivation layers, respectively.Intermolecular interactions between the bulky cations and the strength of cation-halide hydrogen bonds are critical to forming the three distinct passivation layers.Semi-transparent wide-bandgap perovskite solar cells (WBG-PSCs) with ITO as the back electrode show hysteresis-free PCE of 18.60% and VOC deficit of 0.49 V.
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