Issue 37, 2019

Enhanced yield-mobility products in hybrid halide Ruddlesden–Popper compounds with aromatic ammonium spacers

Abstract

Hybrid halide Ruddlesden–Popper compounds are related to three-dimensional hybrid AMX3 perovskites (e.g. where A is a monovalent cation, M is a divalent metal cation, and X is a halogen) with the general formula L2An–1MnX3n+1 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)2PbI4 and (BPEA)2(CH3NH3)Pb2I7, 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 cm2 V−1 s−1 and 1.11 cm2 V−1 s−1 for (BPEA)2PbI4 and (BPEA)2(CH3NH3)Pb2I7, both slightly enhanced over what has been measured for compounds with n-butylammonium spacer cations.

Graphical abstract: Enhanced yield-mobility products in hybrid halide Ruddlesden–Popper compounds with aromatic ammonium spacers

Supplementary files

Article information

Article type
Paper
Submitted
27 Jul 2019
Accepted
27 Aug 2019
First published
05 Sep 2019

Dalton Trans., 2019,48, 14019-14026

Author version available

Enhanced yield-mobility products in hybrid halide Ruddlesden–Popper compounds with aromatic ammonium spacers

N. R. Venkatesan, A. Mahdi, B. Barraza, G. Wu, M. L. Chabinyc and R. Seshadri, Dalton Trans., 2019, 48, 14019 DOI: 10.1039/C9DT03074C

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