Abstract
A family of Ruddlesden–Popper (n = 1) layered perovskite-related phases, Az2PbClxBr4−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.
Highlights
Ruddlesden–Popper (R–P) phases are composed of layered perovskite structures with alternating layers of AMX3 perovskite and AX rock salt along the c-axis
The R–P phase is more commonly used to represent this type of layered perovskite structure and, increasingly, in organic–inorganic hybrid perovskites (OIHPs)
A family of mixed halide R–P phases, Az2 PbClx Br4−x with composition 0 ≤ x ≤ 4 were prepared by mechanosynthesis and their structures and optical properties were analysed by powder X-ray diffraction (PXRD) and absorption spectroscopy, respectively
Summary
Ruddlesden–Popper (R–P) phases are composed of layered perovskite structures with alternating layers of AMX3 perovskite and AX rock salt along the c-axis. They are described by the general formula An+1 Mn X3n+1 Several families of layered OIHPs containing alternating layers of AMX3 perovskite and organic cations with structures similar to R–P phases have been reported. Such examples of layered OIHPs include BA2 PbI4 (BA = C4 H9 NH3 + ) [5]
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