Structural and Chemical Fundamentals of Organic-Inorganic Perovskite Bromides

Perovskite bromides have emerged as a highly promising class of materials in optoelectronics, owing to their tunable bandgaps, high photoluminescence quantum yields, and solution-processable synthesis. Their ABX₃ structure, with compositional flexibility through substitution of organic/inorganic cations (A), metal cations (B), and halides (X), enables precise tailoring of optoelectronic properties. Unique structural features, including corner-sharing, edge-sharing, and face-sharing octahedra, influence electronic transport and dimensionality. Various synthesis techniques approaches are pivotal for controlling crystallinity, morphology, and defect density. Stability challenges, particularly with halide ion migration and environmental factors like moisture, are addressed using advanced stabilization strategies such as low-dimensional perovskites and polyionic liquids. Perovskite bromides exhibit significant potential in solar cells, LEDs, sensors, and photodetectors, with ongoing research focusing on enhancing performance and environmental sustainability. This chapter highlights their structural features, synthesis strategies, and burgeoning applications, emphasizing the need for scalable, stable, and eco-friendly material development.