Azetidinium Lead Halide Ruddlesden-Popper Phases

Jiyu Tian; Eli Zysman-Colman; Finlay D Morrison

doi:10.3390/molecules26216474

Azetidinium Lead Halide Ruddlesden-Popper Phases

Molecules. 2021 Oct 27;26(21):6474. doi: 10.3390/molecules26216474.

Authors

Jiyu Tian^{1

2}, Eli Zysman-Colman², Finlay D Morrison¹

Affiliations

¹ EaStCHEM School of Chemistry, University of St Andrews, St Andrews KY16 9ST, UK.
² Organic Semiconductor Centre, EaStCHEM School of Chemistry, University of St Andrews, St Andrews KY16 9ST, UK.

Abstract

A family of Ruddlesden-Popper (n = 1) layered perovskite-related phases, Az₂PbCl_xBr_4-x with composition 0 ≤ x ≤ 4 were obtained using mechanosynthesis. These compounds are isostructural with K₂NiF₄ and therefore adopt the idealised n = 1 Ruddlesden-Popper structure. A linear variation in unit cell volume as a function of anion average radius is observed. A tunable bandgap is achieved, ranging from 2.81 to 3.43 eV, and the bandgap varies in a second-order polynomial relationship with the halide composition.

Keywords: Ruddlesden–Popper; azetidinium; bandgap tuning; layered perovskite; structure-property relations.