From film to ring: Quasi-circular inorganic lead halide perovskite grain induced growth of uniform lead silicate glass ring structure

Polycrystalline properties of perovskites can induce the growth of different nanostructures, thanks to their facile fabrication. In this work, the CsPb₂Br₅ perovskite grains were used as templates to induce the growth of the ring-like structures on a SiO₂/Si substrate. Owing to the oxidation of the volatile PbBr₂ originated from the decomposition of CsPb₂Br₅, the grain boundaries of perovskites are prone to reaction with SiO₂, which leads to the formation of Pb-silicate glass at high temperatures. The quasi-circular grain structure of CsPb₂Br₅ defines the final dimension of the Pb-silicate glass ring-like structures. X-ray photoelectron spectroscopy (XPS) measurement results reveal the formation and composition of the Pb-silicate glass ring-like structures converting from the halide perovskite film on the SiO₂/Si substrate. Furthermore, these ring-like structures can extend to the field of display and pulsed-laser by combining existing techniques.