Synthesis, Structural and Optical Properties of [(CH3)3S]2BiBr5.DMSO: A Sulfonium based Halide Perovskite-like Compound with Strong Solvent-Metal Interaction

Abstract

The search for alternative renewable energy sources was prompted by the ongoing demand for energy brought on by population growth and a rise in material comfort. In this context, lead-based metal halide perovskites are an active area of research because of their excellent optoelectronic properties such as suitable band gap, high absorption coefficient, and low exciton binding energy. The ease of synthesis and processing of these materials and their low cost and high efficiency make them a potential alternative to traditional inorganic semiconductors. However, the hazardous nature of the lead in these materials precludes their usage in widespread applications. As a result, significant research has been put into finding lead-free halide perovskites with outstanding power conversion efficiency. Sb/Bi-based halide perovskites are one family of lead-free halide perovskites with promising photovoltaic properties. Additionally, by decreasing the dimensionality of these halide perovskites, the stability, and structural flexibility can be enhanced. The 0D hybrid perovskite-like structure can accommodate a wide range of cations and anions, leading to a diverse family of materials with varying electronic properties. In this abstract, we provide an overview of the synthesis of a new hybrid 0D halide perovskite-like compound by using sulfur-based organic cations. The structure of 0D halide perovskite is confirmed from the single crystal X-ray diffraction study. [(CH3)3S]2BiBr5.DMSO crystallizes in the triclinic P1̅ space group and contains isolated BiBr5(DMSO) units as building blocks with strong solvent-metal interaction.[1] The compounds are characterized by using different spectroscopic techniques.