Publication date: 15th December 2025
Since early on in the success story of lead halide perovskites, the element of bismuth has been discussed as a benign, non-toxic replacement for lead, as the stable oxidation states of both elements have the same 6s2 electronic configuration.[1,2] While this leads to a similar chemical behaviour of the elements and similar properties of their compounds, the different charges of the ions prevent direct substitution within the perovskite structure. The perovskite motif can be preserved using an additional metal ion for charge compensation, leading to the double-perovskite or elpasolite structure, but the resulting compounds so far have seen little success in photovoltaic applications.[3] Beyond the restrictions of the perovskite motif, however, hybrid organic-inorganic halide bismuthates display a huge variety of compounds with a multitude of properties, which often show a similar tunability as lead halide perovskites.[4] When preparing halide bismuthates, the choice of organic cation is crucial, as it steers the formation of the inorganic motif and can also add additional functionality to the product. Many different crystal structures have been reported, but structure-property relationships remain poorly understood, especially for compounds containing heterometals.[5,6] We aim to investigate these relationships to better understand this versatile class of compounds to pave the way for future applications as functional materials. The talk will give an introduction into hybrid organic-inorganic halide bismuthates and highlight recent results regarding the structure-property relationships on chosen examples.
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