CHARACTERIZATION OF ORGANIC-INORGANIC PEROVSKITES BASED ON REACTION OF AMINOMETHYL PYRIDINE

Abstract

Different positions of aminomethyl pyridine (AMP) of 2-AMP, 3-AMP and 4-AMP hybrid perovskite were synthesized in this study. The reaction of respective AMP with lead bromide (PbBr₂) via reflux process at temperature of 90°C resulted to the yellowish organic- inorganic powder. The synthesized products were characterized using Ultraviolet-Visible Spectroscopy (UV-Vis), Fourier Transform Infrared (FTIR) Spectroscopy and Energy Dispersive X-Ray (EDX). The UV-Vis analysis revealed that the maximum excitation peak in the absorption spectra for different position of AMP were located at 424 nm for 2-AMP, 368 nm for 3-AMP and 359 nm for 4-AMP. As a result, different position of AMP gave significant different values of calculated energy gap of 2.93 eV, 3.37 eV and 3.46 eV for 2-AMP, 3-AMP and 4-AMP, respectively. The chemical bonding of ammonium ion (NH³⁺), pyridinium ion (C₅H₆N⁺) and aromatic hydrocarbon (Ar-H) at functional group of benzene ring of 2 AMP, 3- AMP and 4-AMP were subsequently observed in the range of 3369 to 3385 cm^-1 as shown by the FTIR spectrum. The slight shift of the wavenumber in the range of 3369 to 3385 cm^-1 indicates the electronegative ion of nitrogen atom in the pyridine ring. The EDX analysis showed the elementals composition bromine (Br) and plumbum (Pb) atoms are almost similar in the synthesized AMP products.