Rainie Nelson1 Bradley Ryan1 Atefe Hadi1 Umar Hamdeh1 Matthew Milot1 Matthew Panthani1

1, Iowa State University, Ames, Iowa, United States

Lead halide perovskites have shown rapid advancements in power conversion efficiencies over a decade, leading to an increased focus in these materials for solar cells and other optoelectronics. However, stability issues and the unavoidable toxicity of lead prove potential barriers to large-scale applications and implementations of the lead halide perovskites. Bismuth has long been a replacement for lead in various applications, and some of the similarities in electronic properties make bismuth an interesting candidate to replace lead for optoelectronic materials. In this work, we describe bismuth halide perovskite and perovskite-inspired materials which demonstrate a wide range of properties. We show photoluminescene of bismuth halide precursor seeds in the synthesis of cesium bismuth halide nanocrystals, absorbance tunability of cesium bismuth halide nanocrystals based on halide composition, thermochromism of a layered double perovskite and the apparent sonocrystallization of nanocrystals from bulk crystals of layered double perovskites of various compositions. We identify promising properties of the bismuth materials and discuss major areas that require investigation in order to make bismuth halide perovskites viable materials for a variety of applications.