Issue 4, 2023

Second-order nonlinear optical properties of copper-based hybrid organic–inorganic perovskites induced by chiral amines

Abstract

Recently, chiral hybrid organic–inorganic perovskites (HOIPs) are drawing wide attention due to their intrinsic noncentrosymmetric structures which result in fascinating properties such as ferroelectronics and second-order nonlinear optics (NLO). However, previous research mainly focused on chiral lead-based halide perovskites ignoring that the toxic Pb element is harmful to humans and the environment. Herein, we successfully synthesized block-like (R-/S-NEA)2CuCl4 (NEA = 1-naphthylethylamine) and needle-like (R-/S-CYHEA)6Cu3Cl12 (CYHEA = 1-cyclohexylethylamine) single crystals, which crystallize in the Sohncke P21 and I2 space group, respectively. Each pair of chiral perovskite enantiomers shows mirror circular dichroism (CD) signals. The thin films show an efficient second harmonic generation (SHG) response and the NLO coefficients of (R-NEA)2CuCl4 and (R-CYHEA)6Cu3Cl12 are 11.74 and 3.04 pm V−1, respectively, under 920 nm excitation with Y-cut quartz as a reference, which shows that the chiral amine has a significant effect on the SHG behavior. The high SHG response of (R-NEA)2CuCl4 is perhaps due to the rigidity of the aromatic amine, which leads to highly asymmetrical space groups. Our results provide guidelines for designing and tuning the SHG response in chiral HOIPs.

Graphical abstract: Second-order nonlinear optical properties of copper-based hybrid organic–inorganic perovskites induced by chiral amines

Supplementary files

Article information

Article type
Paper
Submitted
13 Sept. 2022
Accepted
02 Dec. 2022
First published
05 Dec. 2022

Nanoscale, 2023,15, 1595-1601

Second-order nonlinear optical properties of copper-based hybrid organic–inorganic perovskites induced by chiral amines

B. Li, Y. Yu, M. Xin, J. Xu, T. Zhao, H. Kang, G. Xing, P. Zhao, T. Zhang and S. Jiang, Nanoscale, 2023, 15, 1595 DOI: 10.1039/D2NR05022F

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