4-Methylphenethylammonium iodide

4-甲基苯乙基碘化铵 (4-MePEAI) 是一种新型钙钛矿前驱体， 在有机间隔阳离子苯乙基铵 (PEA) 的 4 位存在甲基基团带来了以下改进： 1）甲基的给电性会增加胺上的电子密度，增强分子偶极子，从而增加铵与卤化物阴离子之间的相互作用。这可能会改善准二维钙钛矿薄膜的形成动力学，并产生具有全覆盖和更大晶粒的更好薄膜。 2）4位甲基的存在将导致准二维钙钛矿前体溶液和所得薄膜中有机阳离子的空间分布更加均匀。准二维钙钛矿薄膜可能具有更均匀的能量景观，因此显着改善了载流子传输性能。 3) 4 位甲基的存在会增加苯乙基部分的亲油特性。 这种增加的亲脂性将增强准二维钙钛矿薄膜的疏水性，进一步提高器件的水分稳定性。 4-methylphenylethyl ammonium iodide (4-mepeai) is a new perovskite precursor. The presence of a methyl group at the 4-position of the organic spacer cation phenylethyl ammonium (PEA) brings the following improvements: 1) The electricity of methyl group will increase the electron density on amine and enhance the molecular dipole, thus increasing the interaction between ammonium and halide anion. This may improve the formation kinetics of quasi two-dimensional perovskite films and produce better films with full coverage and larger grains. 2) The presence of methyl group at position 4 will lead to a more uniform spatial distribution of organic cations in the quasi two-dimensional perovskite precursor solution and the resulting film. The quasi two-dimensional Perovskite Thin film may have a more uniform energy landscape, thus significantly improving the carrier transport performance. 3) The presence of methyl group at position 4 will increase the lipophilic property of phenylethyl moiety. This increased lipophilicity will enhance the hydrophobicity of the quasi two-dimensional perovskite film and further improve the moisture stability of the device.

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