Materials Department, University of California, Santa Barbara, California 93106, USA.
Materials Research Laboratory, University of California, Santa Barbara, California 93106, USA and Department of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106, USA.
Dalton Trans. 2019 Oct 7;48(37):14019-14026. doi: 10.1039/c9dt03074c. Epub 2019 Sep 5.
Hybrid halide Ruddlesden-Popper compounds are related to three-dimensional hybrid AMX perovskites (e.g. where A is a monovalent cation, M is a divalent metal cation, and X is a halogen) with the general formula LAMX where L is a monovalent spacer cation. The crystal structure comprises perovskite-like layers separated by organic cation spacers. Here two Ruddlesden-Popper compounds with a conjugated cation, 2-(4-biphenyl)ethylammonium (BPEA) prepared by solvothermal and solvent evaporation techniques are reported. The structures of the two compounds: (BPEA)PbI and (BPEA)(CHNH)PbI, were solved by X-ray crystallography. The aromatic rings of the BPEA groups are well-separated in the organic layers leading to optical properties comparable to n = 1 and 2 hybrid halide Ruddlesden-Popper compounds with simpler alkyl ammonium cations. The ambient stability of both compounds over time was also confirmed by powder X-ray diffraction. Finally, the transient photoconductance, measured by time-resolved microwave conductivity, show that the compounds have maximum yield-mobility products respectively of 0.07 cm V s and 1.11 cm V s for (BPEA)PbI and (BPEA)(CHNH)PbI, both slightly enhanced over what has been measured for compounds with n-butylammonium spacer cations.
混合卤化物 Ruddlesden-Popper 化合物与三维混合 AMX 钙钛矿（例如，其中 A 是单价阳离子，M 是二价金属阳离子，X 是卤素）有关，其通式为 LAMX，其中 L 是单价间隔阳离子。晶体结构由钙钛矿状层和有机阳离子间隔物组成。在这里，报道了两种通过溶剂热和溶剂蒸发技术制备的具有共轭阳离子的 Ruddlesden-Popper 化合物：2-(4-联苯基)乙基铵（BPEA）。两种化合物的结构：（BPEA）PbI 和（BPEA）（CHNH）PbI 通过 X 射线晶体学确定。BPEA 基团的芳环在有机层中很好地分离，导致其光学性质可与具有更简单的烷基铵阳离子的 n = 1 和 2 混合卤化物 Ruddlesden-Popper 化合物相媲美。通过粉末 X 射线衍射也证实了两种化合物随时间的环境稳定性。最后，通过时间分辨微波电导率测量的瞬态光电导率表明，两种化合物的最大产率-迁移率产物分别为 0.07 cm V s 和 1.11 cm V s，对于（BPEA）PbI 和（BPEA）（CHNH）PbI，均略高于用具有正丁基铵间隔阳离子的化合物测量的值。
