Authors:

Chenyu Li

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Two-dimensional (2D) lead halide perovskite nanowires have emerged as promising materials for advanced optoelectronic applications due to their unique structural, optical, and electronic properties. Compared to their traditional 3D counterparts, 2D lead halide perovskite nanowires (lead halides encapsulated within organic ligands growing in one direction) are known for their durability, tunability, and high photoluminescence efficiency. However, achieving well-defined nanowire crystal structures that can be stable for over a few minutes still remains challenging. In this study, a bulky phenylethyl-ammonium-based ligand with two carboxylic acid side groups named 2P-5IPA3 was explored to address this issue. Strong hydrogen bonding induced by carboxylic acid groups restricts crystal growth in one direction, forming well-defined nanowire structures, while the hydrophobic bulky phenyl groups protect the perovskite from moisture degradation and enhance stability. The ligand was successfully synthesized, with its identity and structure confirmed by NMR. Various methods, including fast cooling, slow cooling, and anti-solvent diffusion, were employed to grow 2D lead halide crystals with this ligand for optimal morphology. Optical microscopy and photoluminescence spectroscopy were applied to the resulting crystals to determine their morphology and relevant optical properties. The crystal structure of the nanowires was studied by XRD. The perovskite nanowires fabricated from 2P-5IPA3 have demonstrated superior dimensional confinement and stability compared to the ones made with BrCA3 and 5IPA3 as reported in the previous studies. This study expands the ligand database for 2D hybrid halide perovskite nanowires and provides insights into improving their structural and optical properties by tuning the ligands. Keywords: 2D Perovskite; Nanowire; Ligand Design; Lasing; Stability

Source:

Purdue University / 2024

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Co-authors:

Chenyu Li