Authors:

Aline Kruger

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About Paper:

Perovskites are structures composed of a general ABX3 lattice, in which the A and B sites are traditionally metal cations, while the X is an anion. Lead halide perovskite materials, however, incorporate an organic ligand at their A site, creating a new class of hybrid organic-inorganic perovskites that are known for their ability to harvest sunlight into electricity. Hence, they have recently become promising candidates for solar cell applications. One major area of research focuses on the substitution of different A-site organic ligands to optimize perovskite power conversion efficiency (PCE) while also probing other challenges, such as susceptibility to environmental degradation and prolonged moisture exposure that limit hybrid perovskite application in real-world solar cell panels. In this research, a series of novel pyridine-based ligands was synthesized to address these issues. Thin films were also prepared and characterized by X-ray diffraction, UV- Vis, and photoluminescence spectra. The UV-Vis absorption spectra display new excitonic peaks, indicating that 2D hybrid perovskites were formed with pyridine-based ligands, which is in agreement with the X-ray diffraction patterns and photoluminescence spectra obtained. In addition, solar cell devices were built and their PCEs fall between 15 - 20.2 per cent. These results indicate that the pyridine-based ligands are tolerated in the lattice and that formation of desired hybrid 2D perovskites is observed. These new derivatives contribute to the expansion of the ligand library available for 2D perovskites and to the search for the best efficiency of solar cell devices employing this new organic-inorganic class of materials.

Source:

Purdue University / 2023

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Co-authors:

Aline Kruger