DOI: https://doi.org/10.55373/mjchem.v25i1.116

Keywords: Amino(methyl)pyridine; hybrid perovskite; low-dimensional; solar cell material.

Abstract

Low-dimensional hybrid perovskites have evolved into an interesting platform for optoelectronic applications like solar cells. Despite their widespread use, there has been little investigation of their structure-property correlations. This study aims to elucidate the chemical, optical and structural properties of various dimensional bromoplumbates synthesized under a closed-system nitrogenized atmosphere without using a glove box. Three different amino(methyl)pyridine (AMP) cations (2-AMP, 3-AMP and 4-AMP) were refluxed at 90 °C with lead bromide in hydrobromic acid solution. The precipitate crystals were grown via a solution-cooling process and their chemical, optical and structural properties were determined. FTIR analysis confirmed the presence of NH3+, pyridinium and Ar-H ions in the products. The characteristic excitation peaks in the UV-Vis absorption spectra of the [(2-AMP)(3-AMP)(4-AMP)]PbBr4 series were located at 432 nm, 429 nm and 357 nm. The optical bandgap energy values of these compounds were determined using an extrapolated line from the Tauc plot, yielding values of 2.87 eV, 2.89 eV and 3.47 eV. The 4-AMP and [(2-AMP)(3-AMP)]PbBr4 samples exhibited peaks at 467 nm and 468 nm in photoluminescence spectra under emission mode. XRD analysis showed high-order diffraction peaks, indicating the formation of a hybrid crystal with a layered perovskite structure.