《Table 1 Stretching frequency of S=O for DMSO solvent, PbI2-DMSO and MAI-PbI2-DMSO adducts with resp

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《钙钛矿太阳电池溶剂工程的动力学阐述（英文）》

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The reaction of an aprotic solvent（Lewis base）with Pb（II）halide（Lewis acid）results in the formation of the adduct，where adduct is coupled by a coordinate covalent bond（electrons shared by Lewis base）to make some coordination complex as typically happens in metal-ligand interactions in most organometallic compounds.The Pb（II）halides are recognized as Lewis acid since they receive iodide anion to make iodoplumbate anion like[Pb3I10]4-and[Pb5I16]6-[45，46].It was stated that Pb（II）halides can form 1:1，1:2，or 2:1 adducts with bidentate（LL）and monodentate（L）ligands with nitrogen，sulfur and oxygen donors[47，48]，like DMSO，NMP，thiourea，thioacetamide，aniline，and pyridine.Ahn et al.[23]elucidated the Lewis acid-base adduct method for perovskite film evolution by using DMF and DMSO in precursor solution and found that stretching vibration of S=O（νS=O）lies at 1，045 cm-1for the pristine DMSO[49]，which is moved to lower 1，020 cm-1for PbI2-DMSO complex and for MAI-PbI2-DMSO complex it further moved down to1，015 cm-1（Fig.5 and Table 1）.TheνS=Oat 1，020 cm-1is relatively steady with the frequency of 1，022 cm-1noticed for the 1:1 adduct of PbI2-DMSO[47].