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Description
The organic-inorganic perovskites (HOIPs) have attracted significant attention as promising new materials for their broad applications, particularly in photovoltaics. Their use as materials for the construction of solar cells is particularly sought-after, given their relatively simple synthesis, low production cost, and environmental compatibility. In this study, the synthesis and characterization of bulk samples and thin films of new hybrid iodide perovskites with aminoguanidinium (${AGu}^+$) as the organic cation, paired with different inorganic cations (${Pb}^{2+}$, ${Bi}^{3+}$, and ${Sb}^{3+}$), is presented.
Aminoguanidinium lead iodide was synthesized by dissolving lead iodide and a pre-synthesized aminoguanidinium iodide precursor in a minimal amount of dimethylformamide (DMF), followed by the Antisolvent Vapor-Assisted Crystallization method. Aminoguanidinium bismuth iodide and aminoguanidinium antimony iodide were synthesized by dissolving a mixture of aminoguanidinium bicarbonate and the respective inorganic compound ($Bi_2O_3$ or $SbI_3$) in concentrated hydroiodic acid. The solution was cooled down to induce crystallization. Thin films of the substances were prepared using the spin coating technique.
The obtained perovskites were characterized by PXRD at room temperature and infrared spectroscopy in a wide temperature range (from –170 °C to 250 °C). The thin films were analyzed with UV-VIS spectroscopy, from which the direct and indirect band gaps were determined.
