Structural Engineering of Cd-Doped Cs₄MnBi₂Cl₁₂ Perovskite via PEA⁺-Cation Doping

Lead-free halide perovskite materials are showing great interest towards optoelectronic applications. Here, we study the effect of cation and metal engineering of the vacancy-ordered Cs₄MnBi₂Cl₁₂ perovskite through incorporating phenethylammonium (PEA⁺) as an organic cation spacer and cadmium (Cd²⁺) as doped metal. EDS elemental mapping, Raman, XRD, and PL measurements were investigated. Upon (32%/68%) (Mn/Cd) metal substitution, the room temperature PLQY increases from 12% in All Cs perovskite to 40% in (PEA/Cs) mixed-cation perovskite. These results highlight the importance of alloying for structure modulation for vacancy-ordered perovskite structures.