Design and Stabilization of Low-Dimensional Hybrid Perovskite Structures

Hybrid perovskites offer an unprecedented opportunity to combine useful attributes of organic and inorganic systems within a single molecular scale composite, as well as to tailor the effective dimensionalities of the inorganic frameworks between one-dimensional (1D) and three-dimensional (3D).¹ Dimensional control over the connected network of corner-sharing metal halide octahedra, in particular, directly impacts energy levels and properties through, for example, quantum and dielectric confinement effects.² While 2D hybrid perovskites have been extensively pursued, the ability to tailor lower dimensionality frameworks has received less attention. One recent example involves employing detailed organic-cation selection to stabilize a family of structures based on quasi-1D ribbons of varying width (and effective dimensionalities <2D, as determined by DFT and optical characterizations). A second example relates to replacing Pb with Bi and stabilizing zig-zag 1D chains of corner-sharing octahedra (so-called 1D perovskites), leading to meltable 1D systems, which can be processed into films.³ Ultimately, goals for this work include extending dimensionality control for perovskite-related systems to <2D and to gain similar control over symmetry and distortion (e.g., using organic cation choice), as well as associated properties, as for 2D perovskite structures.

1. D. B. Mitzi, K. Chondroudis, C. R. Kagan, IBM J. Res. Dev. 45, 29 (2001).
2. C. Katan, N. Mercier, J. Even, Chem. Rev. 119, 3140 (2019).
3. E. J. Crace, A. Singh, S. Haley, B. Claes, D. B. Mitzi, Inorg. Chem. 62, 16161 (2023).