Abstract: The present disclosure relates to a composition that includes a perovskite having a stoichiometry comprising A1-xFAxSn1-yBy(I1-zXz)3, where A is a first cation, B is a second cation, X is a halide, and 0.5?x?0.9, 0.5?y?0.9, and 0?z?1. In some embodiments of the present disclosure, A may include at least one of cesium, guanidinium, and/or methylammonium. In some embodiments of the present disclosure, X may include at least one of bromide and/or chloride. In some embodiments of the present disclosure, z may be equal to zero.

Abstract: The present disclosure relates to a composition that includes a perovskite phase having the stoichiometry ABX3 and a perovskite-like phase having the stoichiometry A?2A?B?2X?, where A is a first cation, B is a second cation, X is a first anion, A? is a third cation, A? is a fourth cation, B? is a fifth cation, X? is a second anion, and A? is different than A?.

Abstract: The present disclosure relates to a composition that includes a perovskite having a surface, where the surface includes a pyridine compound. In some embodiments of the present disclosure, the pyridine compound may include an amine functional group. In some embodiments of the present disclosure, the pyridine compound may be selected from a group that includes N(2-methylpyridine)A, N(3-methylpyridine)A, N(4-(methyl)pyridine)A, N(3-(2-ethyl)pyridine)A, and N(4-(2-ethyl)pyridine)A, where A is a cation, and the pyridine compound has an ionic radius larger than 10 ?.

Abstract: The present disclosure relates to a composition that includes a material of at least one of a perovskite structure, a perovskite-like structure, and/or a perovskitoid structure, where the material includes an isotope of an element, the isotope has more neutrons than protons, and the isotope is incorporated into the perovskite structure, the perovskite-like structure, and/or the perovskitoid structure. In some embodiments of the present disclosure, the isotope may make up between greater than 0% and 100% of the element.

Abstract: The present disclosure relates to a device that includes a layer that includes a perovskite, where the layer has a first side and a second side defining a thickness, the perovskite has a bulk composition as defined by AB(X1-yXy?)3, where A includes a first cation, B includes a second cation, X includes iodide, and X? includes bromide, y is between 0.2 and 0.8, inclusively, and the thickness has a bromide concentration gradient across the thickness with a maximum concentration at or in the proximity of the first side and a minimum concentration at the second side.

Abstract: The present disclosure relates to a composition that includes a perovskite phase having the stoichiometry ABX3 and a perovskite-like phase having the stoichiometry A?2A?B?2X?, where A is a first cation, B is a second cation, X is a first anion, A? is a third cation, A? is a fourth cation, B? is a fifth cation, X? is a second anion, and A? is different than A?.

Abstract: The present disclosure relates to a composition that includes a perovskite having a stoichiometry comprising A1-xFAxSn1-yBy(I1-zXz)3, where A is a first cation, B is a second cation, X is a halide, and 0.5?x?0.9, 0.5?y?0.9, and 0?z?1. In some embodiments of the present disclosure, A may include at least one of cesium, guanidinium, and/or methylammonium. In some embodiments of the present disclosure, X may include at least one of bromide and/or chloride. In some embodiments of the present disclosure, z may be equal to zero.

Abstract: The present disclosure relates to a composition that includes a material of at least one of a perovskite structure, a perovskite-like structure, and/or a perovskitoid structure, where the material includes an isotope of an element, the isotope has more neutrons than protons, and the isotope is incorporated into the perovskite structure, the perovskite-like structure, and/or the perovskitoid structure. In some embodiments of the present disclosure, the isotope may make up between greater than 0% and 100% of the element.